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09 Mercury 150 Efi Fuel Pump Stays On.

Thread in 'Motors & Props' started by Christian, Jan 29, 2019.

  1. Christian

    Christian Member

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    Hello all.
    Twice now I have found that the internal fuel pump for my 08 mercury 150 EFI runs with the key out and motor off.

    I walk past it and hear the humming of the rfi pump. I'm thinking that there might be a relay that is sticking on.

    If anyone has seen this or had this happen before please let me know.


    Thanks ahead of time.

    Chris
     
  2. jerry shack

    jerry shack Well-Known Member

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    What turns on the EFI pump in the VST(vapor separator tank) tank is the PCM (propulsion control module) which is part of your fuel management system. Try to disconnect the battery wait about 5 min and reconnect see what happens, if the same thing follow the wire on top of the VST tank and see if it goes into the PCM if so tap the PCM with plastic hammer see if that works.
     
  3. Christian

    Christian Member

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  4. Christian

    Christian Member

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    Update...
    I found it with the fuel pump running again last week.
    I removed the cawl and carefully with one fingertip lightly moved the wire harness around the engine.
    I found a spot on the starboard side of the engine that while I pressed it in the pump turned off. When I released pressure it cam back on.

    The harness had two very small abrasions on it that grounded out.

    I fixed abrasions and reduced the harness.
    Problem solved.
     
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