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    Thread: Fuel pump relay buzzes? No start. CIS-E

    1. Member NewUnit16's Avatar
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      Dec 10th, 2008
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      03-23-2012 05:03 PM #1
      89 GLI CIS-E 16v

      Replaced the relay and no change. Have swapped to known working: coil and ignition module. I am getting spark to the plugs. This happened quite randomly when I was making a standard left turn.

      I am quite sure its an issue with fueling. I just have not gone through the troubleshooting of the fuel system. (Sat over winter, not very motivated with a gravel driveway).

      I can hear the pump running despite the relay buzzing. I have also bypassed the relay at the fuse box and this does not change anything. I am thinking a bad ground wire somewhere?

      Why would the fuel pump relay buzz? Undervolt protection?

    2. Member NewUnit16's Avatar
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      03-26-2012 10:00 AM #2
      Nobody heard a fuel pump buzz? I have. I cant seem to find it in the bently either. May be time for random inspections on all systems at once =]

      Oh I could have mentioned... I am getting proper ~13v at the relay terminals on the fusebox. I cannot check while under load though.
      Last edited by NewUnit16; 03-26-2012 at 10:18 AM.

    3. Member
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      90 fox, 85 gli
      03-27-2012 05:38 PM #3
      First symptom with the left turn points to the in-tank transfer pump or pickup. That'll strain/kill the main pump in short order. As it is, either the bad transfer pump or overloaded main pump is likely causing your relay to buzz.

      Check / replace the transfer pump / pickup in the tank and go from there. There's an access window in the trunk I believe.
      I really suck at smog.

    4. Member NewUnit16's Avatar
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      03-28-2012 09:08 PM #4
      Thanks a lot for the advice! I was under the assumption the main pump would pump through the transfer pump, allowing it to start but run like ****.

      In light of this info I will start there instead of on my back in the gravel

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