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I have an 85 Chevy K10 with ECM computer and a TBI system I've rebuilt rebuilt a TBI system put a new fuel pump high volume and replace the pump relay now when I turn the key to on

It does not shut off after the 2 second or 3 second turn on is activated what would cause this not to shut off I replace the ignition switch to fuel pump relay traced all my wires any ideas

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Hello Jesse,

What does not shut off?
And what are you referring to when you say "the 2 second or 3 second turn on.

Please clarify your issue and include some more information on your K10 model and engine.

Posted on Apr 20, 2017

  • jackdo2 Aug 13, 2017

    Hello Again Jesse,
    The short on cycle from your stock fuel pump may not be how your new high volume fuel pump
    operates. Please contact the parts dealer where you purchased you new fuel pump to inquire about the products operation.

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Code p025a fuel pump module tested relay it is good why is there power on # 85 with key off


DTC P025A: Fuel Pump Flow Control Module Enable Circuit
The engine control module (ECM) supplies voltage to the fuel pump flow control module (FPCM) when the ECM detects that the ignition is on. The voltage from the ECM to the FPCM remains active for 2 seconds, unless the engine is in crank or run. While this voltage is being received, the FPCM closes the ground switch of the fuel pump and also supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel rail pressure.
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  3. Ignition ON, verify that a test lamp illuminates for 2 seconds.
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