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ChrisWeeK1100RS
Flying Brick Rider
Joined: 06 Sep 2009
Posts: 162
Location: Malaysia
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 Posted: Wed Sep 09, 2009 12:10 am Post subject: Low-fuel feed / stalling problem |
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Hi everyone,
As mentioned in my introduction, the 1993 BMW K1100RS I bought recently was lying idle for the better part of 8 years, and during that time, the fuel tank accumulated a bunch of sediment and muck.
Despite being cleaned thoroughly and fuel filter changed, there's still a stalling problem. However, I only occurs when the fuel level is at 1/4 tank. I reckon if it were still sediment clogging up the intake or injectors, it would happen all the time and not just at 1/4 tank right? The bike will be able to restart after a few minutes after stalling.
Also, the fuel gauge needle becomes very erratic at around the same time (1/4 tank), flicking itself between 1/2 and empty.
Any idea what could be causing the stalling problem? I'm thinking it could possibly be the fuel outlet from the tank itself, positioned wrongly perhaps; too high and not getting any feed when the fuel is low?
Please advise. Thanks in advance all 
Chris
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"Ride hard or stay home..."
'93 BMW K1100RS
Mileage: 37,000km-ish
Malaysia |
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Scott_Anderson
Site Admin
Joined: 05 Sep 2006
Posts: 3127
Location: Central Iowa, USA
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| Posted: Wed Sep 09, 2009 12:18 am Post subject: Re: Low-fuel feed / stalling problem |
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| ChrisWeeK1100RS wrote: | I'm thinking it could possibly be the fuel outlet from the tank itself, positioned wrongly perhaps; too high and not getting any feed when the fuel is low?
Please advise. Thanks in advance all
Chris |
I'm thinking that you are on the right track. If the P.O. had the fuel filter replaced it's possible that the fuel pump assy could be out of alignment and not picking up fuel like it should.
You say the bike sat for 8 years. The fuel pump is mounted in a rubber holder, it's possible that after that much time that the rubber could be gum and not holding the pump assy in proper position.
As far as the fuel guage, that float assy is on the other side of the tank, we had a previous poster was having problems with his guage/low fuel light not reading right when low and found that when the fuel filter was replaced, the fuel hose for the filter was laying on the right side of the tank and blocking the float from going low with the fuel level.
_________________
Ride safe.
1997 K1100LT 0302488
2017 FLHTK Ultra Limited
Garmin StreetPilot 2820
Garmin Zumo 550
Garmin Zumo XT
"One who does not ask questions is ashamed to learn" Danish proverb
1995 K1100LT 0302044(R.I.P.)
1997 R1100RT ZC62149(sold) |
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ChrisWeeK1100RS
Flying Brick Rider
Joined: 06 Sep 2009
Posts: 162
Location: Malaysia
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| Posted: Wed Sep 09, 2009 12:53 am Post subject: |
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Thanks for the info and advice Scott! Someone was suggesting I get the tank cut open and scrubbed out, then welded back together.
I did catch a glimpse of the 'floater' for the fuel gauge when the bike was in the shop and it looked in bad shape; encrusted with muck.
I'll get the shop to check out the rubber mount for the fuel pump right away, as well as its positioning.
Cheers!
Chris
_________________
"Ride hard or stay home..."
'93 BMW K1100RS
Mileage: 37,000km-ish
Malaysia |
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Rafal
Flying Brick Rider
Joined: 05 Jan 2009
Posts: 257
Location: Wroclaw, Poland
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| Posted: Wed Sep 09, 2009 4:02 am Post subject: |
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| ChrisWeeK1100RS wrote: | Thanks for the info and advice Scott! Someone was suggesting I get the tank cut open and scrubbed out, then welded back together.
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Oh my God  who told you to do so barbarity thing?! You can access a tank interior by removing the fuel level sender assembly (remember to put new rubber o-ring).
Best regards
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Rafal
K1100RS is a real beast (in Marrakesh Red)
K75S is a real beauty - she has gone  , but not to far .
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RobWheatley
Flying Brick Rider
Joined: 06 Jun 2008
Posts: 261
Location: Chatham, Kent. UK
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| Posted: Wed Sep 09, 2009 6:22 am Post subject: |
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Also when you remove the fuel filler cap by taking out the 4 allen bolts the hole is big enough to get a hand in.
DONT forget the tank is Aluminium and not steel (try and get a magnetic tank bag to stick, I did and they wont... Doh)
I would remove the pump assembly and check the rubber mounts, on mine there is also a filter on the end of the pump (bottom) that might be causing trouble.
If you send me you Email I have a workshop manual in PDF I can send you, its for an LT/RS 93 on.
Rob
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1999 K1100LTIC Smooth and Quiet Cruise, BFD & HID
1996 K1100RS. dead but not forgotten. |
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Scott_Anderson
Site Admin
Joined: 05 Sep 2006
Posts: 3127
Location: Central Iowa, USA
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| Posted: Wed Sep 09, 2009 7:42 am Post subject: |
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Something you might consider Chris, when you get all of the insides, pump assy w/ lines, float assy, etc.. out of the tank and also remove the seal plate with the wiring assy, you could have the inside of the tank STEAM cleaned to try and remove the gunk from the tank.
NOT SAND OR GLASS BEADS BUT STEAM
Not to mention the obvious that after a good steam bath, requires very, very thurough dry out.
We used to have a repair shop here in town that would steam clean fuel tanks for restorers etc...
_________________
Ride safe.
1997 K1100LT 0302488
2017 FLHTK Ultra Limited
Garmin StreetPilot 2820
Garmin Zumo 550
Garmin Zumo XT
"One who does not ask questions is ashamed to learn" Danish proverb
1995 K1100LT 0302044(R.I.P.)
1997 R1100RT ZC62149(sold) |
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