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Old 10-27-2013, 11:24 AM   #1
Dooga OP
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K1100LT with Asthma

Bike's running fine except when the revs get to around 4,200 rpm when it seems to peter out, unable to accelerate past around 75-80mph when it starts to decelerate, lose power, until I roll off and the roll back on the throttle. Is it fuel injection, an issue with the fuel pump, or something else? I had been dicking around with additives hoping it would help but it's not. Anyone have any experience with all this? Otherwise, I can go check out the K11 forums.

Thanks in advance!
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Old 10-27-2013, 11:45 AM   #2
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Air filter???

Just a guess.
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Old 10-27-2013, 11:47 AM   #3
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That makes a lot of sense. I'll see if that's the issue. Need to head over to Bob's BMW.
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Old 10-27-2013, 02:14 PM   #4
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Fuel filter?
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Old 10-28-2013, 06:13 AM   #5
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that is how my R1100RS acted before the fuel pump quit at 65,000 miles.
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Old 10-28-2013, 12:35 PM   #6
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I'd try the fuel and air filters first. If that's not it check the fuel pump flow and pressure.

How long since the last valve adjustment?
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Old 10-28-2013, 01:22 PM   #7
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Put a pressure gauge on the hose at the fuel rail.

Pump probably is going bad.
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Old 10-29-2013, 06:49 AM   #8
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It's probably the fuel pump

OK, it's probably the fuel pump (thanks guys) -- I'll be heading to EUBMW/Quality Automotive & Motorcycle Repair tomorrow to have Khanh look at it to confirm.

Question: An 18-year-old K1100LT: OEM fuel pump or an after-market.

What say the inmates of ADV?

Thanks in advance.
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Old 10-29-2013, 07:35 AM   #9
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Sounds like fuel symptoms.

If it is still OEM, your fuel pump has a filter "sock" at the base of the pump. That could be clogged.

The donut that surrounds and secures the pump may have disintegrated and will clog the pump and/or filter.

The filter itself could be full of crap.


Experience with several K100/K1100 bikes
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Old 10-29-2013, 07:56 AM   #10
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DC2 gave you good advice ^


BMW or not? BMW, for sure.
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Old 10-29-2013, 08:13 AM   #11
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Originally Posted by kraven View Post
DC2 gave you good advice ^ BMW or not? BMW, for sure.
OK I'll have him look at filters, socks, etcetera, first and then, if the pump is dying, then I'll go OEM. I really like the bike. Thanks again.
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Old 10-29-2013, 10:49 AM   #12
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Has the charcoal canister been removed? If not, the make-up air that enters the gas tank as fuel is removed may not be getting in. Symptoms would be a fuel gauge that indicates more, rather than fewer, miles until the tank is empty as you ride, and a whooshing sound when you open the gas tank cap.
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Old 10-29-2013, 07:08 PM   #13
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Last time I gassed up the fuel backed up into the reservoir when I opened the cap. Like bubbled out. Is that a signifier if something?
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Old 10-30-2013, 07:36 AM   #14
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Initial diagnosis: air filter. Arrived late so I'll need to return tomorrow but bloody great (initial) news.
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Old 10-30-2013, 07:42 AM   #15
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OK I'll have him look at filters, socks, etcetera, first and then, if the pump is dying, then I'll go OEM. I really like the bike. Thanks again.
http://ibmwr.org/ktech/fuel-pump-install.shtml
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