F650GS Fuel Tank FAQ
compiled & edited by Kristian #562
Please read the Disclaimer before
attempting any work in this FAQ.
Last Updated: 21 October 2006, by Winter #1935
For other related FAQs:
Recalls and Service Bulletins:
- Please see the Service Bulletins FAQ
- 19-Sep-2000, 16-002-00 (036)r, Recall 00V-267: Fuel Tank Replacement
- Aug-2006, 16-001-06 (039), Check of fuel-pump return port
- (CS Only) May-2004, 16-002-04 (009), Advance Notice of Recall: Possible Fuel Pump Flange Leak
- (CS Only) May-2004, 16-002-04 (009), Recall 04V-236 - Installation of fuel pump flange cap
|Fuel and High Pressure|
In case you did not know, fuel/gas/petrol is flamable. So no nekkid
flames if you are messing with the fuel tank. If you manage to set fire to
your bike, please take a photo so everyone can remember it for ever and ever.
Of course if you are sensible you will have appropriate fire fighting
equipment in your garage to put out any fires around your bike.
Also note the Fuel Injected bikes (GS, Dakar, CS, G650X) have
pressurised fuel lines. When you turn the key to the on positions, one of
the sounds you should hear is the fuel pump pressurising the line. Just after
you turn the bike off the fuel line will still be under pressure. In other
words: If you are removing fuel lines, wait a while (dunno, 24hours?) before
removing them, and make sure you remove them outside with your fire equipment
and camera nearby.
|Running Low on Gas/Fuel/Petrol|
|On the fuel injected bikes, the fuel is used to cool the fuel pump.
Thus the less fuel you have in the tank, the less there is to cool the
pump. So running your bike until the fuel runs out is not ideal as you may
damage your fuel pump.
My Gas Tank is Split/is Leaking. Is this Common?
- Well there is a Recall Notice out on EARLY Tanks, but some
problems even with '02's have been reported, which are NOT part
of the recall. See the list of Service Bulletins at the top of this
FAQ for the Recall notice.
- Look at the cap under the seat hasn't come loose and fuel
isn't pooling there as the bike bounces around. Just need to tighten it
- A recall has been issued for the F650CS models in May 2004 related to
fuel leaks. If you do experience a leak on any bike similar to those leaks listed here, first
contact your dealer - as another recall may have been issued. If they do
not wish to fix the problem, contact your national transport safety
organisation (in the US try the
- Feedback on Split Tanks
There was a recall for faulty fuel tanks in the US for some of the early GS
models. Mine, with a July 00 build date, was one of them. The problem had to due
with potential leaks due to thin wall in the tank somewhere. Mine never leaked
and I never heard of any that actually did. Suffered similar hairline cracks in
the fuel pump assembly cap just 2 weeks ago. Dealer assured me this was a
different problem than the initial gas tank recall. Had to epoxy the cap until
dealer was able to get the replacement part. All covered under warranty, but
fuel spilling on hot exhaust definitely an attention getter! Here is a photo of
the cracks that developed in the fuel pump assembly cap. They seem to follow a
diagonal line up the cap, so I believe it may be from a molding problem. I
should still have photos of the cracks that developed in my cap just after the
6K service. Interesting to see this problem on an '02GS, I previously figured
the problem was due to a bad batch of caps in the early production. Thanks to
Mike#976 for the Photo.
- Like Mike #976, I also had a hairline crack in the fuel
pump/filter assembly "cap" on top of the tank. My '01 GS had
about 4200 miles on it, and it was about 9 months old so the
fuel pump/filter assembly was replaced under warranty. (Bike is an 02-2001
build) Since I've had no real surge/stall issues I was worried that the
replacement fuel pump would be "below spec" (see the FAQ page) and would
possibly cause problems. But to my surprise, it ran fine and the already great
mileage (~61 mpg commuting to work) improved a bit, ~65 mpg. Barrett ABQ.
- Having just re-fuelled at a service station, to my surprise,
a "fuel river" developed from
under my seat. Having removed my seat, upon closer inspection, I discovered a
hairline-crack on the black carbon? insert on top of the fuel tank. I will be
contacting my dealer on Monday morning for a fuel tank replacement. Have other
2001 F650GS owners in South Africa had this problem? Joe Ruhfus, Advrider
- All the US tanks
were replaced almost two years ago, right after the new 650 was introduced here
in the States. My delivery was delayed 4 weeks while new tanks were shipped and
installed on all the dealer's bikes, and those of customers who had already
taken delivery. The replacement tanks have a sticker affixed to the top that
shows the replacement date. Jinx, Advrider.
- Smell gas? I did,
and removing the seat from my '01 GS/D revealed a leak around a hose fitting on
top of the tank -- gas was pooling in a depression around the pump fittings. I
loosened the clamp, pushed the hose down further, and retightened it and the one
next to it. That fuel pump puts out high pressure for the injection system. It's
easy to test for leaks by simply removing the seat and turning key on for a few
seconds. I'll do this regularly now to prevent any unplanned BBQ's. Larry#694.
- 650 GS Leaky fuel
filler/tank. Apologies if this subject has been covered already on this board,
but obliged if anyone can help. I have a year 2000 650GS which has a tendency to
leak fuel: are there any known problems /solutions? As far as I can see the fuel
leaks from somewhere under the plastic panel, rather than from the filler cap
and then runs down over the dimpled plastic piece onto the chain guard. When I
fill the bike I do tend to brim it, but I fill it on the centre stand rather
than side stand so I don't think that is the issue. Maybe it is but....I filled
up yesterday and have done maybe 20 miles and it is still possible to slosh fuel
out by jerking the bike over to the right. Is there a breather pipe or similar
in there? I haven't had time to dissemble the parts yet so any ideas anyone?
- 650 GS Leaky fuel
filler/tank. Hi Nick, Next time you detect the leak have a look under your seat.
I had a problem where the cap under the seat had come loose and fuel was pooling
there as I bounced the bike around, just had to tighten it. Andre Whistler, BC.
- Leaking Fuel Cell
GS Dakar. Got back from a long weekend of dicing it up with HD's and Wing's, boy
were they surprised that my German weed-wacker could do what it does so well,
smoked em good!! Anyway Noticed that gas was dripping slowly when filled and on
the side stand. Seems there are hair line cracks around the right side fuel pick
up hose of the fuel cell which for a Dakar is directly under my butt. Imagine my
surprise when I took the seat off and found the recessed area where the two hose
go into the fuel cell filled with 94 octane send ya to the moon highly explosive
gasoline. Tom1089 s.c. pa
- Gas Leak. And I
don't mean the bean burrito kind. Past couple of rides I've been smelling gas
('02F650GS). I found a hair-line crack in the large round cap on top of the tank
that has the fuel line connections running to it. The crack is between the
electrical plug on the right and one of the fuel line connections on the left.
Fuel does not puddle, but seeps out slowly. The plastic surface in the area of
the crack is not smooth like the rest of the plastic. Looks like a defect. But,
I just had my 6k mile service done and maybe someone left a tool on top of the
tank and tried to press the seat back in place. This is not out of the question
since my throttle cable was mis-routed and one of the turn signal plate screws
was cross threaded (previous post). I remember someone on this board with the
same fuel leak problem. Has anyone else experienced this? If so, can you
rule-out the "tool left on top of the tank" scenario? I'm wondering if this is
another fuel tank defect issue. Rod, CO '02GS - 15-Aug-02
- We pull in to get
gas tonight. Fill mine, turn away, turn back and I've got gas gushing all over
the place. Holy Moly! Appears that I have a crack in the fuel pump assembly
cap....just like the FAQ. Easy to see. Here's the kicker. Himself fills his,
turns around and his is puking too!!! Same deal. Huh? At the same time?. Took
them apart this a.m. Crack was understating it. His looks like a spider web.
Mine's actually in pieces. Have a hard time thinking that gas would make them
explode. Went back and read the stories. Three of us in NM, one in Colorado, one
in South Africa and the others unnamed locations. Suppose heat and/or altitude
contributes? Ours cracked just where you said, but cracked in multiple
locations. Totally trashed. Shelley798.
- I've had the same
problem, fixed under warranty. It could be either a design problem or
materials/workmanship problem or some combination of both. I tend to believe it
is a design problem and I wonder if BMW has redesigned the part. It is a serious
problem with a potential for someone getting seriously hurt. It looks like the
fuel pump/filter assembly is cantilevered (down) from the round flange that you
see on the top of the tank. Mine cracked near one of the web sections that
stiffen the flange. If both of you rode through the same places/same speed it
would have put the same dynamic loads on the fuel pump/filter assembly and could
have resulted in both flanges cracking. Someone with some time and a finite
element package could investigate the design. If there really is a problem and
BMW ignores it and someone gets hurt, some lawyer somewhere will hire an
engineer to investigate the design. I discovered mine was cracked only after a
fill up when, like most, fuel started leaking out. I had smelled fuel the days
before I noticed the actual leak. Anyway, since it only leaked at the top, I
tilted the bike for a while to let the fuel leak out and get the level down
below the crack so I could ride it up to Sante Fe to get the tank replaced. So,
I wasn't really stranded, just rode a bit dangerously for a few miles. Barrett
- Earlier this year I
had the tank on my bike replaced (under warranty) because it was gushing fuel
down the dimpled panels every time I filled up. I believe the problem was in the
filler tube area in that instance. 6 months with no problems and now......it's
happening again. I took the seat off in the garage one night when it was full to
observe carefully and it is clear that it seems to be coming out of the circular
part of the tank (which looks like a big screw top, if that makes sense) which
has the various pipes and hoses coming out of it. Does anyone know if this is
part of the moulding, or a separate part which could be cinched tight in some
way. I'm hopeful that my dealer will get the tank replaced again under warranty
but it is such a pain to be without the bike (and to have to ride a loaner
Yamaha 125 SR....) Any similar experiences? Repoman
I had just filled
up on the way home, and I when I pulled into the garage I smelled some serious
fumes. I pulled the seat off, and I saw the image above. I sopped up most of the
gas (how many of you can say you've used a diaper to work on your motorcycle? -
I figured it was the most absorbant thing around the house :-), but it is still
seeping out slowly. Some other questions... Any way to depressurize the system
to stop the seepage? What are those connectors for? Gas doesn't conduct
electricity very well, right? Do I need to worry about something shorting out?
Would I be nuts to ride this ~2 miles to the dealer? I already rode about 5
miles home from the gas station. MichaelC#941
Repairing a Leaking Gas Tank
- Is there some kind of epoxy that will truly fix something like this? I suspect this is a warranty item, but if I can fix it myself with very little time involved . . . Or maybe the crack will grow? Scott, ID #1244
- Many automotive stores will carry a epoxy or resin. Make sure you
check it is safe to use on fuel tanks AND plastic. Winter #1935
- Here's a link on how to weld plastic. I'm sure this will be cheaper than buying a new tank if you're out of warranty (doesn't sound like it) or if a new one cracks again after you're out of warranty. NothingClever #1441
Why does the American Gas Tank contain less Fuel than the European
- Because of the Emissions Canister, that fits in a
recess moulded into the US Tank. You can buy the Euro-spec Tank from
Touratech, for all of 1.5l extra fuel, and a lot of $$. Or get it off a
Euro-wreck. by David H Park #711
- I have a '01 F650GS
and I have always wondered what is maximum fuel capacity? The brochure for the
'03 F650GS/ Dakar lists it at 4.0 gallons but I recall that one time the fuel
pump indicating that I put in 4.15 gals. Was the pump inaccurate or does the '01
hold 4.25 gals??? I know that bikes sold outside the US hold more fuel because
in order to install the emissions cannister BMW designed a modified fuel tank
for the USA. Has anyone drained the tank and then refilled it to see what they
actually hold? I realize that without a fuel gauge we all just ride till the
warning light goes on and then look for a gas station. As a footnote: my bike
seems to be getting better fuel mileage as I accumulate the miles. I haven't
changed the fuel filter in over 24K miles and on the last tank the warning light
didn't go on till 196 miles :>) Dave. Inmate # 717 - '01 F650GS
- I didn't have my
Dakar long enough to get that familiar with it, but my Classic would hold 0.5
gallon more than the specs detailed. I'm guessing that the specs list what the
tank will hold if it meets absolute minimum manufacturing tolerance. That way if
someone runs out of gas, they can't be held liable in some fashion. Harl #380
- The BMW website
lists 4.4 gallons for the GS as its fuel capacity. My yellow fuel warning light
goes on when 3.2 gallons have been used. echo
- My Rider's Manual
(US Model) says total capacity 4.6 Gallons (17.3 Liters). Warning light is
supposed to come on when the tank is down to approximately 1.1 gallons (4
Liters). '03 black F650GSA, Runaway #1259 (CO)
What is the charcoal filter in the American tank for?
- The charcoal canister is
emissions related. The charcoal filter it contains is in the vent loop. The
thinking is that when you fill the tank it keeps all those nasty gas fumes that
occupied the "empty" part of the tank from floating free. Except the fuel nozzle
doesn't cover the fuel filler opening while pumping so it does exactly fuck-all.
It connects via an electronic solenoid and then back into the engines intake
What's the average GS Gas Mileage/Range?
- How long is a piece
of string? There is no one number. So many factors, Tire Pressures, Laden
Weight, Exhaust, Aftermarket Fuel Moderators, Wind, Air Filter Condition & Type
....So here's some feedback. Classic holds 4.6 gals. vs. GS 4.4. Assuming both
in 1st class operating condition, they are comparable. The GS does a bit better
on mpg but the older Fs hold a bit more fuel so the overall range is pretty much
- Conversions: For those in the US: a UK (imperial) gallon is 4.55
litres. A US gallon is 3.79.
Which is 1 Imperial gallon = 1.2 US gallons
Thus, US mileage for a reported 50mpg (UK) = 50 / 1.2 = 42 mpg (US)
Here's a Good Converter
- This newer version of the F650 seems to be getting considerably better mileage
than the old F, largely due to Fuel Injection.
Mileage of 55-65 mpg seems to be very common with some reports close to a
ridiculously high 70mpg!
- So it
must be the fool injection that gives me over 60 mpg regularly on my Dakar. It
has even hit 70 a couple times. No kidding. I checked mine yesterday while
playing hooky from work...70.76923. SScratch '01 Dakar Nashville
- I have
noticed that if I use my bike to drive to and back from work every day, then
in the winter the m/tank is a lot worse than in the summer. I got really
worried last winter when my m/tank dropped to around 130, but in the summer I
was getting my original 200ish. Adam 906NC '01 GSD
F650GS my best mileage was 62 miles/US gallon. I went 210 miles before hitting
the reserve light. I had the wind in my back. Sojourner, 2000 F650 GS.
- Last weekend I took my 02 Dakar on an 800 mile trip. Fully loaded: 240 pounds
of me, sidecases and tankbag full, large dry-bag with full camping kit. A real
range of riding, including long 80 mph superslab legs, county two-lanes, hilly
twisties, fast fire roads, and slow gravel. A lot of it was pushing the bike
pretty hard to keep up with buddies on Boxers and K bikes. Corner exits at
Full War Emergency Power were the norm.
Trip average: Around 52-54 mpg.
For what it's worth, this is what I commonly get at the pump.
DakotaDakar on Advrider.
- I have kept
accurate records of every fill since new in July last year now have 7,000 Klms
on the clock my average per tank on highway running at 90/115 klms/hr is 400
klms., absolute maximum was 420klms.Off road is approx 10 % less max on reserve
was 108 klms. Hope this helps. Aussie-John #334
- My 2001 GS goes an
average of 180 miles before the low fuel light comes on. I have gone to 220
miles w/o refuelling, and put 4.0 gallons of gas in the tank. This is mostly
freeway driving, 60-80 mph. I get better mileage at lower average speeds. Also,
my mileage started going up when I hit 10,000 miles, now an average of 55 mpg.
The motor also started getting smoother, and is even smoother now at 12,000
miles. YMMV. Dan#823 in Orange Cty, CA - 28-Mar-02.
- Gas mileage. I have nearly 3000 miles on my GS since last October,
and have gotten a low of 60 to 62
to a high of 71.6 using premium gas not bad ! Andy - 30-Mar-02
- Usable tank
capacity. Remembering speedo error, In kilometres, I can get 300 before the fuel
light comes on, and then 100 more on reserve (light "on") for a total of 400
kilometres. This is not driving easy by any means...a mix of cruising and
spirited playing. When refuelling, the most I've put in at this 400 point is
16.2 litres, and if the tank truly does hold 17.5 litres, that left me with 1.3
litres in the tank. Approx 67 miles per imperial gallon ...confused yet? 16.2
divided by 4.5 (amount of litres in an imp gallon) equals 3.6, 400 kilometres
multiplied by .6 equals 240 miles, 240 divided by 3.6 equals 66.67 mp imperial
gallons, 66.67 multiplied by .8 (Imp gallon to US, help me here) equals 53.34,
If you were to use all 17.5 litres (3.89 imp gallons) and multiply it by my
66.67 miles, you should get around 259.35 miles per Imperial gallon, or 207.48
US gallon, If my math is off, please adjust and post. I was up late last night.
- Dakar consistently
gets 65 to 70 under normal conditions of 70/75 mph. Not much less when you
really hammer it. DirtDOG on Advrider
- I get between 65(
on crappy winter gas) to 72 MPG. Usually around 68MPG. Regular F650GS. Wings on
- I average between
65 and 70. It goes a littler higher when spacewife is riding it. When I am out
having too much fun on the 650, like when I followed you guys up to Monterrey, I
only got about 50 mph, but that was with the throttle wide open most of the
time. PhilSpace on Advrider
- 50-59, depending on
how hard I hammer it. ShaftEd on Advrider
- I spent a month on
a loaner F650GS (non-PD model), and averaged 60MPG most of the time. I had a
blast, would love one if they weren't so damn expensive.... Its a great bike for
our local goat trail roads. Advrider
- Wifey is getting
65+ the way she rides. My son swears he got 75 mpg when he borrowed it. Ruskie
- For some reason I
kept a record on my F650GSD, never done it before, probably won't again. But for
WIW here's the overall picture. Average from Start:
Total Kms 19205 Total Fuel 843.27L Kms/L 22.80 L/100Kms 4.39. Best: L/100Kms
3.56 Kms/L 28.08 Max. Kms 485.80. Worst: L/100Kms 5.17 Kms/L 19.33 Max. Kms
334.47. George on Advrider
- L/100km drives me
nuts. Lets see. in 'murkin, he said...Average from Start: Total miles 11933,
Total Fuel 222.7 Gallons 53.6 MPG, Best 66 MPG Max. 301.8 miles
Worst 44.46 MPG Max. 207.8 miles.
41.30154639, 48.80798969, 45.77691812, 46.72609899, I am only driving 3 miles to
work and 3 miles back, mostly. Not much else until the winter ends, if it ends.
Hopefully it will improve when I start to ride it more. Padraig on Advrider
- Runs consistently
that short are bad for the engine, it never gets fully warmed up, and moisture
condenses on things inside the engine... you really should try to take it a few
more miles at least once a week, maybe stretch the ride home to 10 miles once in
awhile. Marty on Advrider
- At one time I was
getting 65-68, I haven't checked for a while. Last summer on the way to AZ, I
got 58 trying to keep up w/ Jock and Mully. Bird on Advrider.
- I am getting 55 mpg
consistently on my '01 Dakar riding solo on twisty backroads. I am usually
running between 3500-5500 rpms, 3rd-5th gears. This is just the first 1300
miles, though. I'm hoping it gets even better after breaking in a little more,
maybe not. SScratch '01 Dakar Nashville.
- Best economy: 3.6 l/100km Worst: 5 l/100 km Lance,
#1303, '01 F650GS.
- I have been getting
22-27km/L (no idea of conversion to gallons) depending on throttle action and
headwinds. I just had a Remus exhaust fitted and got a bit better - 27.5 at
around 110 on the highway. That's 51.7 - 63.5 MPG
- In summer my kind of riding gets 62 mpg whereas this
winter same riding (maybe a little shorter avg distance) and I'm getting 50 mpg
echo F650GS Dakar, Camden, New Jersey.
When does the Low Fuel Light come on?
- Depends on your mileage of course!
- On F650GS my best mileage was 62 miles/US gallon. I
went 210 miles before hitting the reserve light. I had the wind in my back.
Sojourner, 2000 F650 GS Toronto, Canada
- The yellow low fuel
light came on going home last night after 189 miles since last fill up. It took
3.2 gallons to fill the tank one mile later. It seems I've gone that far before
but cant remember the light going on. How many gallons do listers put in their
tanks when the low fuel light comes on? (01 Dakar) I seem to remember the tank
is 4.5 gallons with .5 gallon in reserve. echo
- I filled mine today
shortly after the light came on and it took 3.2 gallons too. F650GS. Sam#1238MI
- "Your mileage may
vary"... Depending on how fast you go, the light may come on sooner than later.
I've gotten as many as 225 miles (lazy, winding country roads) and as little as
165 miles (super slab, 85+mph) before the light came on. Savant of the pavement
- Light comes on when
I've used 3.2gal on my '02 GSA, typically 210 highway/road miles. Seems like
this is the consistent answer (very precise light! Accuracy is another story.),
so lots left when in comes on. Cheers, Greg #1245
- I have a 2001 GSA.
If I do almost all freeway miles at 75+ mph, I get about 170 miles before the
light comes on, and I fill with about 3.2 gallons if I don't go too far after
that. If the riding mixture is more toward twisties and relaxed riding at about
50 mph average, I can get over 200 miles before the light goes on. I rode the
tank dry once, within 50 yards of a gas station (Talk about luck!), and it took
4.2 gallons to fill. My impression is that my mileage went up as I approached
12,000 miles on the bike and remained about the same thereafter, but I don't
keep the kind of records that would verify that. Dan #823 (Southern CA)
- Hmm, low fuel light
comes on with 1.3 gallons remaining in tank on these bikes. Good to know! echo
- I was told by my
dealer that about 2 liters are unreachable by the fuel pick-up. Keeps the water
and crud from getting sucked into the filter. Keith in Alaska #714
- 3.2 gallons most every time. Scott, ID #1244
- My '01 GSA's low
fuel light comes on at 150 miles in warm summer weather and 125 in cold winter
weather, the tank takes 3.2 gals at the pump each time. My driving is zero
freeway, all stop and go country 2-lane roads (Bainbridge Island) and city
stoplights (Seattle). About 15 miles round trip daily commute. I flog the engine
and rev 'er up to 5000+ at each shift. I'm not trying to save gas and it shows,
but it is fun to drive this way. Snapper1065.
- Hi guys & Gals--I
know we have just covered this but...2nd tank on 02 Dakar Reserve on at 167
miles. Topped off at 3.23 gallons.. 52 MPG --- tank w/out reserve should have
gone to +- 200? What am I figuring wrong. Mileage is GREAT for my fat ass.
Question I have is at 50+ MPG reserve light should not be on until 200+ miles if
tank is 4.5 gallons w/ .5 reserve. Right? I think the US tank has only 4.1
gallons total, because they had to create a space for the cannister :-(.
Capacity per 02 Specs from BMW website is 4 Gallon w/ .7 reserve. Makes my math
- Well the one time I
ran my Dakar out of gas (intentionally) to check distance on the tank I took
4.45 gallons according to the meter at my local Texaco and had traveled 267
miles. I don't pay much attention to reports of how far to the low fuel light as
this is adjustable and seems to vary a good bit from bike to bike. But I always
get over 200 before I fill unless I am really running hard into a headwind.
No Petcock? Emptying the GS Gas Tank?
In preparation to ship my bike I was going to use a siphon hose
to drain the gas tank on my 2001 F650GS. Are there any other recommended ways to
drain the gas tank? Is there a hose that is hidden that I can may disconnected
to let gravity do the work. Please remember that this is a 2001 fuel injection
bike with the gas tank that is under the seat. Rodger (#1046).
- There are two hoses at the tank. The fuel feed line is the one with the arrow
(pointing toward fuel filter). The other (return) line has no arrow. Disconnect
fuel feed line at fuel filter. You'll need to replace the clamp with a new one.
There are two electrical connectors at the tank. One is power to the fuel pump
(I don't have the schematics with me to identify that connector). Remove
fuel-pump power connector at tank. Run two wires from the battery to the exposed
pins at the tank. You *MUST* get the polarity correct! I've drained the tank
before, prior to removing the rear subframe to change shims (Can you say "GS
with ABS?; I knew ya' could."). In this situation, the fuel filter and battery
are already exposed and accessible. In your situation, it might be easier to
just use a siphon. If you plan to use the fuel pump to drain the tank, you
*MUST* get the polarity correct! Raymo #1173, Chicago, 2001 F650GSA
- When I tested my fuel pressure I just connected the hoses
(together) and put the ignition ON. With no back pressure the pump will run
until the ignition is turned off. Just remember the
system is under pressure, so when the hoses are removed some petrol will squirt
out. (remove the fuse for the headlight first to avoid draining the battery too
much). Running the fuel pump dry will destroy it, so better be observant
during the draining. It has a lot of pumping capacity so be careful.
- The Polarity is
(To be advised)
Fuel Light Not Working?
- Check the globe (you will need to take part of the dash apart)
- Note: The fues for the fuel light is the same one used for all the dash, so if the fuse has blown you would have no lights on the dash at all
- The low fuel circuit appears to be rather simple. One side of the bulb is always hot at 12v. One side of the switch, in the fuel tank, goes directly to ground. The low fuel switch in the gas tank is just a float attached to the switch. At low fuel level it completes the circuit between the ground at the switch and the 12v at the bulb.
I had 12v at the bulb and a good ground at the switch. I pulled the switch out of the tank and by manually operating the float, it completed the connection to ground. This told me I had a break in the wire between the switch and the bulb. I didn't want to rip the wiring harness apart to find the break so I just ran a new wire from the switch to the bulb. The circuit now works fine. StmbtDave
Before you try this:
- check the bulb (swap with another one you know works)
- check that you have 12v on one side of the bulb (with the key on)
- check for a good ground at the switch (brown wire)
- pull the fuel pump/switch assembly and verify that the switch works
- Much quicker...... Pull the seat off. One connector on top of fuel pump goes to pump. The other connector goes through the switch. Use the schematics to figure out which is which. Jumper the two conductors on the plug side of the switch plug.
The low fuel light comes on= faulty or mis-adjusted switch in tank
Light does not illuminate= faulty bulb or wiring.
It takes less than 2 minutes to do this and it will tell you so much. jetdocs550 #1546
Fuel Light Coming On Early?
- Has anyone had a problem with their fuel light coming on too soon. Mine comes on when there is still 2 gallons left in the tank. I ride about 25 miles after the fuel light comes on and then refuel and it only takes 2.8 Gals. They replaced the whole fuel module and now it is slightly better as it took 3.1 gals this time after riding 25 miles. honeybrk
- That seems way too soon. When my '05 low fuel light comes on, it takes me approx 3.4 gals to fill it up. A.T. #1625
Does the OEM tank have an overflow?
Yes. On the left side of your bike there should be a small tube
coming out near the center stand. This tube runs up to the highest point
of the tank. If you remove the seat you should see the overflow pipe
running up to the tank behind the BMS-C / Fuel Injection computer.
Should I refuel on the sidestand or centerstand?
- It seems to me that the fill opening on the GS is relatively in its highest position while on the side stand (because it's on the side of the bike), unlike the bike with the filler in the top center, which would be highest while on the centerstand. djw #1736
- I fuel on the side stand and rock the bike to expel any air so I can fit in max fuel load, especially when on a trip. I sometimes carry extra fuel in bottles but NEVER allow the machine to actually run out, as it can possibly cause accelerated wear on the roller cell fuel pump. jack #1977
- A fair question. Intuitively, I'd think that for the GS you could get more in with it on the sidestand. You never really know though?
If anyone ever takes their tank off for whatever reason do two tests with gas or water at the two attitudes. You could weigh it.
I guess right now we could fill it up to the brim on the sidestand, shut the flap, put it up on the centerstand, open the flap and see if any runs out or it's lower. motoplaner #1671
Gas cap failure?
- Is it just me, or is the little metal piece that holds the gas filler cap closed as ABSOLUTELY UNCOMPROMISINGLY ULTRA-SUPER-DAMNED-MINIMALISTICALLY TINY as it can possibly be and still barely function? I hate having to get that cap closed and locked with gloves on. And I have this nagging suspicion that over time it's going to wear down and at some point fail to latch properly. McGuireV10
- hey now... the manual in my 03 does say to use the key to close the fuel cap. So if you are concerned about the cap wearing down... just use the key to open and then close the thing!!! Easy one! FIUF650
- I do not use the key. I push down firmly until I hear the satisfying "click" telling me that the cap is locked.
If I own my bike for 100,000 miles and get about 210 average miles per tankful. My limited high-skooo math tells me the gas cap will have 477 cycles on it in 100,000 miles. I'm not terribly worried about wearing it out. jetdocs550 #1546
Is there an aftermarket gas cap?
Colour Fade on Fuel Tank
- does anybody else have their black fuel tank turning greyish from UV (presumably) and if so are there any products you use or reccomend to protect the plastic. my bike isnt garage kept and i only cover it when i am gone for a long time. also i got it used and it was faded when i got it. colin
- From information I have been told, the plastic panels are painted. replacement panels can be purchased either painted OR unpainted, according to thye BMW parts listings. I THINK BMW use Standoz paint, from memory. YMMV jack #1977
RevJVegas: Using paper towels, and a cigarette lighter to see what I was doing, I mopped up all the gas.
pwendell: Uh, Raj, you didn't really use a cigarette lighter to look at a gas leak, did you?
RevJVegas: No I didn't really...just checking to see if y'all are paying attention.
pwendell: I am relieved. I'd hate to hear about an Inmate going up flames, it'd be a waste of a nice bike too