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Thread: Rust in fuel system

  1. #1
    Join Date
    Oct 2018
    Location
    Tennessee
    Posts
    1
    My Cars
    1986 325ES 1998 318I

    Rust in fuel system

    I have an '86 325ES. I have been battling rust that is clogging the injectors. I have replaced both fuel pumps, the fuel tank, metal feed and return lines, injectors, filter and all rubber lines. Most recently I deleted the fuel damper stuff around the external pump.
    I have the fuel rail off again to clean the injector screens. I cannot think of anything else that could hold rust except for the rail itself. It doesn't look rusty inside from what I can see? Any suggestions would be appreciated!

  2. #2
    Join Date
    Sep 2015
    Location
    West Chester Pennsylvania
    Posts
    106
    My Cars
    1991 BMW E30 318is
    If the car ever sat for a while and got water in the tank I suppose it could be rusting from the inside out? I would think your fuel filter would take care of that, but maybe not. That’s about all I can think of


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  3. #3
    Join Date
    Mar 2007
    Location
    Joliet,IL
    Posts
    1,121
    My Cars
    87 325is 96 GMC Suburban
    That’s a pretty thorough list of replacement parts, so i would say the issue is in the fuel filler neck and the tube that connects to the tank itself? I do agree that the filter should be catching any possible debris before it makes it to the injectors, so one more thing to verify is that the fuel lines are not swapped at the motor or the filter, somehow allowing unfiltered gas directly into the injectors?

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