My 1992 BMW K75 engine stutters. It would miss, i.e. a split second cut-off like a click every 10 to 20 seconds. The problem got worse over time and the acceleration is affected. To spare you the rigmarole of troubleshooting the air, spark, coil, etc., the problem is a 28 year old deteriorating submersible fuel hose inside the tank shredding and clogging up the fuel filter.
Engine stutter - its the fuel filter
- Thread starter Hank Wong
- Start date
i kinda hate the design they used there, in tank pump and filter. the failure modes suck. i've resurrected 2 "ran when parked" K bikes with seized pumps and general gas tank jankiness. did you get the fuel hose rated for submersion in alcohol fuel?
Agree. My guess was electrical initially with the engine stutter symptom until, later the symptom progressed into acceleration, i.e. the bike would hesitate and bolt forward when the fuel filter was pressured into bypass mode. Also agree with the fuel filter inside the tank is not optimal, however, the in tank design seems to be the norm now and I post this as a search record for others to think fuel filter before chasing after spark causes. I bought a BMW tank refresh kit and replaced with submersible hoses. The fuel hoses were actually not too bad except at the clamp ends. The main culprit was the fuel pump cradle rubber grommet and the plastic covers over fuel pump's electrical terminals.
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I had this happen on my 73 Challenger. It would run fine for awhile and then it would start to pulse and sometimes die. I would push the car and then after a few it would start right up again and then work for some time before I had to go through the same routine. Couldn't figure it out for ages then when I was thoroughly frustrated I went to our mechanic to have him look at it and when I explained it to him he said oh it's the fuel filter that's clogged. He said that there was probably a small unclogged portion and then some piece of gunk would float up plug the hole and it would kill the engine. When the suction dropped the gunk would drop out of the hole and it would start all over again. Went home changed the filter and voila no more issues. Now that is always the first thing I do if the vehicle pulses or has random fuel-related issues it's usually a cheap fix and needs to be done anyways.
