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Thread: 1992 K75s fuel delivery problems

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  1. #1
    broadstone
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    1992 K75s fuel delivery problems

    I just bought a 1992 K75 which sat with only a small tarp cover for over 2 years. It wasn't running but I installed a new battery as a start toward at least getting it running. When I first tried cranking it there was some weak firing but didn't respond too well to the throttle as if running way too lean. I cranked it again using the "choke" full on resulting in gasoline accumulating in the exhaust pipe after about 10 to 15 seconds of cranking. It did not fire even once. I decided to try leaning it down by clamping off the fuel delivery line between the pump and fuel rail (i know this would not be advisable) and it ran great for about 5 seconds until the fuel line was empty. I tried again to crank it normally and.....nothing. To see if the fuel delivery line was pressurizing, after.about 10 minutes I loosened the fuel line at the fuel rail and it still had considerable pressure. I let it sit for a day and now it starts and runs terribly like the mixture is too lean but the plugs are sooty but dry and it won't really run at all at small throttle openings. This is my ninth BMW over 20+ years, five of which were fuel injected but I have never encountered anything like this. Any ideas would be appreciated.

  2. #2
    Rally Rat
    Join Date
    Sep 2007
    Posts
    1,248
    You may have popped the fuel filter off the hose inside the tank, or even ruptured the filter by clamping the hose between tank and rail.

  3. #3
    broadstone
    Guest

    K75 fuel delivery problems

    Thanks, Lostboy. I'll check that out; I have to remove the tank anyway to attempt to bleed the front ABS unit.

  4. #4
    Registered User
    Join Date
    Mar 2008
    Location
    Belton Tx
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    605
    Quote Originally Posted by broadstone View Post
    Thanks, Lostboy. I'll check that out; I have to remove the tank anyway to attempt to bleed the front ABS unit.
    You don't have to remove the tank to check the filter or bleed the ABS.
    Ron

    91 K75RT ABS

  5. #5
    broadstone
    Guest

    92 k75S fuel delivery

    That would really be great as I wasn't looking forward to removing the entire fairing to achieve that as I read on several web sites. I can't see the ABS unit so do I assume its necessary to remove the fairing to get at the ABS or at least the radiator screen? Thanks for your input. Jim

  6. #6
    Registered User
    Join Date
    Mar 2008
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    Belton Tx
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    605
    the ABS modulators are the bean can looking things at each passenger footpeg. the right 1 is for the rear brake and the left 1 for the front brake. Each. has a bleeder valve.
    Ron

    91 K75RT ABS

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