Fuel Pump Issue FX140
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  1. #1
    PWCToday Newbie
    Join Date
    Feb 2015
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    Sarasota
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    Fuel Pump Issue FX140

    Hey,

    So I've got a real head scratcher. I recently went to fire up my ski, no start. Long story short found out my fuel pump wasn't turning on with the ski.

    Went through the service manual and checked the relays and everything check out per specs. Checked the fuses, all good. Even swapped relays and ECU with the wife's ski.

    Finally just pulled the pump and hooked it up to a battery, sweet molasses it worked! Check the voltage at the plug/white connector is giving a reading of 5.5-6V.

    I believe the fuel pump requires 12V? AND if I am correct why I am only getting 1/2 the voltage required????....

  2. #2
    PWCToday Newbie Matchsticks's Avatar
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    Apr 2019
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    Re: Fuel Pump Issue FX140

    Most likely corrosion, if it’s not getting proper voltage then you’re probably putting that power somewhere else. I’d check all wires and connections before chasing more costly solutions

  3. #3
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Jun 2006
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    Arkansas
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    Re: Fuel Pump Issue FX140

    Ohm out the harness from fuel pump ground to the block or battery. The grounds in the Yamaha harnesses tend to go flaky.
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  4. #4
    PWCToday Newbie
    Join Date
    Feb 2015
    Location
    Sarasota
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    Re: Fuel Pump Issue FX140

    Update,

    I did some wire tracing and ended up being a bad ground.

    Added a ground from the battery to the pump and ran just fine. Then i repaired the bad ground

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