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No power to fuel pump

Posted by Layne97gst, Jun 13, 2018

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  1. Layne97gst

    Layne97gst Probationary Member

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    0
    Joined Jun 13, 2018
    north zulch, Texas
    I have a 1997 mitsubishi eclipse gst 2 liter turbo that's a manual, that I just put a new alternator on,it has crank and air but no power to fuel pump but all fuses are good and lighting up so what could it be
     

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  2. JPenny

    JPenny Proven Member

    76
    10
    Joined Feb 24, 2016
    Corpus Christi, Texas
    Hey how are you checking power to the fuel pump? I might be wrong, but I think on these cars the pump only activates while engine is cranking. It does not "prime" with just ignition switch on like other vehicles. Thank you for your time, Jason Penny
     
    My DSM:
    1997 Mitsubishi Eclipse GST

    Street Build

    T25   manual
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    Teezy and chrysler kid like this.
  3. chrysler kid

    chrysler kid Proven Member

    1,572
    374
    Joined Dec 20, 2002
    Mckinney, Texas
    Correct.

    On a 2g turbo the black 2 pin connector behind the throttle body on the fire wall can be jumped with a paper clip to provide 12v to fuel pump to prime the pump without the key cranking
     
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  4. steve

    steve DSM Wiseman

    12,582
    432
    Joined Feb 3, 2002
    St. Charles, Illinois
    The ECU controls the fuel pump. When it wants the pump on it pulls the signal line from the fuel pump relay to ground. That causes the relay to switch on and power the pump.

    I've seen people blow the transistor on the ECU that switches the signal by jumpering the wrong pins on the relay or ECU with 12v. Normally the resistance of the relay coil protects the transistor.

    Get out the multimeter and start checking the circuit. It will be clear in short order where it's failing.
     
    My DSM:
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