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fuel pump relay not getting power

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  • Jackfrost
    replied
    What was the final outcome?

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  • 88 PS190
    replied
    That's where I start making jumper wires and replicating what it should be doing.

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  • mtajpa
    replied
    Maybe some info in this document that will help. Pages 2 and 4 are what you need to look at for fuel pump issues. Hope it helps.
    Attached Files

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  • lakedrum03
    replied
    Check the following:

    With batteries on, do you have power to the pink wire in at the fuel pump relay?

    With the key on, do you have the same?

    With the key on, do you have ground to at the green/white strip wire at the relay?

    When you turn the key on, is your fuel gauge working?

    If not any any of those, then it may be the lanyard switch. It is just a two pin plug so you should be able to jumper it out to check it.


    Anything other than that then you may need to start teating apart harnesses and checking for broken wires.

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  • Ts87
    replied
    Well case still open... Plugged in the new ecm and no luck, still no power to the fuel pump. Brought it to a local shop to have another set of eyes look over it. I'm stuck, anyone else have any ideas??

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  • Ts87
    replied
    Update in case anyone is wondering. I sent my ecm off to OBD Diagnostics in California. Great shop they were able to diagnose in less than 2 days. My ecm is fried, they think it was a voltage spike that caused the issue. Shipped me out a new ecm same day. Highly recommend if you are having ecm problems. New one should be here monday, so hopefully a water test monday afternoon. (Have to love having a lake 10 mins from my door.)

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  • StingrayDad
    replied
    There is a company called Technical Services that can repair these (ecm). I believe they are located in Indiana and sometimes post on this site. Hope I was able to help.


    Sent from my iPhone using Tapatalk

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  • mikeg205
    replied
    An unclean ground can cause a number of problems. You may have continuity but it could be a dirty connection. ECMs usually work or completely fail.

    Also, check the battery cables, they may look ok, but could be corroded on the inside, causing a dirty ground.



    Sent from my SM-G955U using Tapatalk

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  • Ts87
    replied
    Correct. Mine is j1-23. But yes continuity between j1-23 and 86 on the fuel pump relay.

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  • StingrayDad
    replied
    I’m assuming you mean continuity between 86 and j2-09? If that’s the case I would say ecm needs some repair.


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  • Ts87
    replied
    I have continuity back to ecm. So I’m thinking it is ecm failure? Anyone see anything I’m missing?

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  • StingrayDad
    replied
    I think you found the problem. On my 04 x-star the fuel pump control is j2-09. Wire is dark green with white stripe. But my ecm is a mefi-4. I don’t know if they are the same.


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  • Ts87
    replied
    Ok so I ran home at lunch and made some progress. Made jumpers to separate the relay and test. I’m getting power with ignition on to 85 and 30. The ground path back to ecm (pin 86) is bad and not triggering the connection between 30 and 87. I ground 86 to engine block and my fuel pump came on. Tested with fuel pressure gauge and I have pressure to the rail. Good.

    Now to fix the faulty path of 86, the ground back to ecm. Is there a main wire coming out of ecm for the ground that I can check and clean up? If so what PIN number and port 1 or 2? Or is this a sign my ecm is failing and it’s time to send it in to be tested?

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  • 88 PS190
    replied
    Agree on continuity testing - when a fuse blows sometimes other things can go bad,
    I believe on your boat its MEFI-3 and in that case the ECM relay energizes the fuel pump relay (not through the ECM) so you should have power out on pin 87 of the ECM Relay that then goes into the fuel pump fuse then into pin 30 on the fuel pump relay.

    So if you don't have power on fuel pump pin 30 I'd do continuity to ECM relay 87

    ECM Relay 87 is in turn powered from battery to ECM relay 30 from its fuse. So you can sort of trace back through.

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  • Ts87
    replied
    That is great to know. Thanks for the info StingrayDad. I checked terminal 86 and it was not getting power. I will check to see if 30 is getting power also and chase those wires back to see if i can find my problem. I thought that terminal 86 was getting power from the ecm and then triggering power to fuel pump.

    Thanks Skydyvyr, I have checked the safety lanyard, it is functioning. That was my next step was to do continuity checks. I was hoping it wasn't going to result to that but that may be how i spend my long weekend instead of on the lake.

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