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Thread: no power to fuel pump what can I do?

  1. #1
    Junior Member
    Join Date:  Apr 2019

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    no power to fuel pump what can I do?

    I replaced the rpm and lambda relays , still no power at fuel pump.

  2. #2
    Senior Member
    Join Date:  Jun 2011

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    My VIN:    3937

    Make sure the inertia switch hasn't tripped. The plunger needs to be in the down position for there to be power going to the pump. If it's up, it won't let the pump run (will also keep your door locks unlocked as another indicator).


    Sept. 81, auto, black interior

  3. #3
    Senior Member DMC-81's Avatar
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    Location:  Florida

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    Quote Originally Posted by RICHB View Post
    I replaced the rpm and lambda relays , still no power at fuel pump.
    Hi, and welcome! Also, can you check fuse number 7? Is the power there, and is there any signs of melting?
    Dana

    1981 DeLorean DMC-12 (5 Speed, Gas Flap, Black Interior, Windshield Antenna, Dark Gray)
    Restored as "mostly correct, but with flaws corrected". Pictures and comments of my restoration are in the albums section on my profile.
    2006 Dodge Magnum R/T (D/D)
    2010 Camaro SS (Transformers Edition)

  4. #4
    Senior Member Bitsyncmaster's Avatar
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    Location:  Leonardtown, MD

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    Quote Originally Posted by RICHB View Post
    I replaced the rpm and lambda relays , still no power at fuel pump.
    Your engine has to be running (ignition firing) to get power to fuel pump. Lambda relay has no effect on fuel pump running.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  5. #5
    Junior Member
    Join Date:  Apr 2019

    Posts:    7

    Quote Originally Posted by Jonathan View Post
    Make sure the inertia switch hasn't tripped. The plunger needs to be in the down position for there to be power going to the pump. If it's up, it won't let the pump run (will also keep your door locks unlocked as another indicator).
    inertia switch plunger down

  6. #6
    Junior Member
    Join Date:  Apr 2019

    Posts:    7

    Quote Originally Posted by DMC-81 View Post
    Hi, and welcome! Also, can you check fuse number 7? Is the power there, and is there any signs of melting?

    #7 fuse ok no melting

  7. #7
    Junior Member
    Join Date:  Apr 2019

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    Quote Originally Posted by Bitsyncmaster View Post
    Your engine has to be running (ignition firing) to get power to fuel pump. Lambda relay has no effect on fuel pump running.
    engine not starting , but turns over ok

  8. #8
    Senior Member DMC-81's Avatar
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    Ok. Do you have a multi-meter to check that you have 12v at the pump (or is that what you already did to report no power)?

    Also, any relevant history would help. i.e. Is this a new problem, and if the car was running recently, did you have any unusual symptoms?
    Last edited by DMC-81; 04-13-2019 at 08:35 PM.
    Dana

    1981 DeLorean DMC-12 (5 Speed, Gas Flap, Black Interior, Windshield Antenna, Dark Gray)
    Restored as "mostly correct, but with flaws corrected". Pictures and comments of my restoration are in the albums section on my profile.
    2006 Dodge Magnum R/T (D/D)
    2010 Camaro SS (Transformers Edition)

  9. #9
    Junior Member
    Join Date:  Apr 2019

    Posts:    7

    Quote Originally Posted by DMC-81 View Post
    Ok. Do you have a multi-meter to check that you have 12v at the pump (or is that what you already did to report no power)?

    Also, any relevant history would help. i.e. Is this a new problem, and if the car was running recently, did you have any unusual symptoms?
    I used a multi meter and the car was running on 4-10 with no problems but would not start the next day.

  10. #10
    Senior Member
    Join Date:  Jun 2011

    Posts:    4,431

    My VIN:    3937

    See if any of the electrical connections on the ballast resistor are loose or disconnected.

    Is your car an automatic or manual trans? The car won't start on automatics if the shift lever isn't all the way up into park.


    Sept. 81, auto, black interior

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