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Thread: Fuel pump not priming but works on it's own

  1. #1
    Junior Member
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    Fuel pump not priming but works on it's own

    Need some electrical advice. 2000 X1 Lightning. Accidentally let the battery die by leaving the parking light on in the garage for a few days. Battery wasn't able to be recovered, so I bought a new battery. Installed it, and now the fuel pump won't prime (ecm throws a 33, fuel pump short to ground). Fuses are fine, ignition relay is fine (tested with a multimeter), and the pump works when I give it 12V power directly, both at the pump contacts and it's connector (gray and brown w/yellow stripe wires if I'm remembering correctly). Bypassed the bank angle sensor to rule that out. Bike still cranks when I thumb the starter button. It seems like a circuit isn't closing somewhere but I have no idea at this point. Rode fine before I killed the original battery. I have access to the service manual, and I plan on bypassing the clutch and sidestand safety switch to rule those out.
    Any thoughts?
    Last edited by dreygata; Today at 12:01 PM.

  2. #2
    Senior Member Cooter's Avatar
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    If the bike cranks over, it isn't any safety system issue like a clutch or kickstand switch so don't bother with those.

    You are right the BAS interrupts the fuel pump circuit, but IIRC there is a specific fuel pump relay on those, not just the ignition relay (and it would throw that code). If I'm right try swapping them around with the key on and see if it primes.

  3. #3
    Junior Member
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    Feb 2019
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    Hm, true about the other safety conditions. I'm just trying to isolate the issue really well.
    I think i tried swapping the starter and fuel pump relay, but I can try again. I know I pulled the fuel pump relay out and tested resistances with a multimeter and it's operation with a separate battery, and it seems fine.
    Is there a way to see if the ECM is supply power/grounding out the connector properly?



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