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  1. #1

    Default fuel pump not working when starting, ignition switch wiring?

    I have a 1989 454 that the electric fuel pump doesn't run when I try to start it, it will run when wired direct to battery. Fuel pump is new, oil pressure sensor is new. Fuel gauge used to work when that switch was turned on, now it doesn't. Could the ignition switch be suspect? I can't find a wiring diagram for it.
    Thanks, I'm trying to get this engine running to haul out for coming hurricane!!!!

  2. #2
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    8,376

    Default Re: fuel pump not working when starting, ignition switch wiring?

    a 1989 454 would be a MarkIV block which would mean the electric fuel pump was a retrofit. It would normally be wired with an Oil Pressure Switch (not a sensor).

    I'd say the switch could be the issue if you also DONT have spark...

    I'll see if I can find the schematic for the factory wiring for using an electric fuel pump...

  3. #3
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    8,376

    Default Re: fuel pump not working when starting, ignition switch wiring?

    attached should be the engine wiring diagram from an early 2000 crusader using an electric fuel pump...
    Attached Files Attached Files

  4. #4

    Default Re: fuel pump not working when starting, ignition switch wiring?

    Quote Originally Posted by makomark View Post
    a 1989 454 would be a MarkIV block which would mean the electric fuel pump was a retrofit. It would normally be wired with an Oil Pressure Switch (not a sensor).

    I'd say the switch could be the issue if you also DONT have spark...

    I'll see if I can find the schematic for the factory wiring for using an electric fuel pump...
    I have spark etc, just fuel pump not coming on...

  5. #5

    Default Re: fuel pump not working when starting, ignition switch wiring?

    Quote Originally Posted by makomark View Post
    attached should be the engine wiring diagram from an early 2000 crusader using an electric fuel pump...
    Thanks! That helped. Now I'll check red wire from starter.

  6. #6
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    12,122

    Default Re: fuel pump not working when starting, ignition switch wiring?

    The electric fuel pump circuit requires the following:

    A N/O (normally open) low oil pressure switch that will do 2 things:

    ..... close the circuit and provide power to the fuel pump once engine oil pressure is achieved.
    ..... open the circuit and cut power to the fuel pump in the absence of oil pressure.

    1..... During engine cranking, the oil pressure is not enough to close the N/O low oil pressure switch and activate the fuel pump.

    2..... In order to power the electric fuel pump during cranking, we need what's called a "start-by-pass" circuit. This is generally triggered by the starter motor's "S" circuit.

    3..... In order to prevent an electrical back-feed, you may see a relay in this circuit that would be excited by either the LOP S, and/or by the start-by-pass circuit.
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

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