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Thread: Fuel pump failure?

  1. #1
    Senior Member
    Join Date:  May 2011

    Location:  Norton, MA

    Posts:    783

    My VIN:    767 (3.0L EFI/EDIS)

    Fuel pump failure?

    I ran out to do some errands today, and my car died just as I pulled into a parking space. When I got back out, it wouldn't start. It would crank and catch, and then promptly stall. I soon found that I had zero fuel pressure, thanks to the fuel pressure gauge I'd installed in the engine compartment.

    I have DMCH's fuel pump/sender combo. The car has only been on the road for seven months, and the pump was used for testing before that, and has been installed soon after I bought it in 2013 (the car was not operational when the pump was installed, as I was doing an engine swap at the time). However, the pump has worked fine until now.

    After some false leads, I found that the main fuel relay does have power. The relay is being energized by MegaSquirt (in a 3.0L EFI conversion, so no RPM relay). Once I finally remembered about the test mode in TunerStudio, I turned the pump on and confirmed that I'm getting 12v all the way to the pump connector, and that I'm getting ground from the other side of the connector that runs to the inertia switch. I also opened the tank and confirmed there was fuel in there (about half filled).

    So, I'm fairly confident that everything is working up to the pump, and that the failure is at the pump or the white control box that feeds into the pump. The fuel gauge still moves when I try to turn on the car, so I'm thinking it's the pump itself, but I' m not totally sure.

    delorean.com mentions that individual parts are available separately for this pump/sender combo, but how would I go about figuring out which part has failed? I'm well past the 6 month warranty, so getting just the part I need would be ideal.

    Thanks!

    -- Joe
    Last edited by jangell; 07-28-2019 at 05:58 PM.

  2. #2
    Senior Member Patrick C's Avatar
    Join Date:  May 2011

    Location:  Northern Michigan

    Posts:    1,039

    My VIN:    1880

    Club(s):   (DCO) (DCUK)

    My DMCH combo pump failed last year and wasn’t making enough pressure.
    Patrick C.
    VIN 1880
    Modifications done to my car can be seen in this video: https://youtu.be/ncMjW2pI2e4

  3. #3
    Senior Member
    Join Date:  Aug 2018

    Location:  Virginia

    Posts:    331

    My VIN:    1623

    Sound like the pump. The white control box you mentioned is the microprocessor for the sending unit. I believe it adds a correction value in order for your fuel gauge to be more accurate.
    DMCF rebuild 2008, Stage II, Eibach

  4. #4
    Delorean Guru
    Join Date:  May 2011

    Location:  Northern NJ

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    Club(s):   (DMA)

    Once you pull the pump you can try putting 12 volts and ground directly to the pump and see what happens. Maybe a broken wire? It is possible the pump is dead.
    David Teitelbaum

  5. #5
    Senior Member
    Join Date:  May 2011

    Location:  Norton, MA

    Posts:    783

    My VIN:    767 (3.0L EFI/EDIS)

    I pulled the pump this morning and applied 12v and ground to the connector. Instead of whirring like a motor, it clicks like a solenoid. I'm guessing that means it's dead.

    At least my filter looks reasonably clean, with just a bit of captured debris.

    IMG_1918.jpg

    Thanks!

    -- Joe

  6. #6
    Delorean Guru
    Join Date:  May 2011

    Location:  Northern NJ

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    My VIN:    10757

    Club(s):   (DMA)

    If it clicks it means the power is getting into the pump but it won't turn. As "Bones" would say in Star Trek, "It's dead Jim".
    David Teitelbaum

  7. #7
    Senior Member Josh's Avatar
    Join Date:  Mar 2013

    Location:  SK, Canada

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    My VIN:    11408

    Club(s):   (TXDMC)

    I had my dmch integrated pump/sender fail on me fairly quickly as well.

    That filter looks very good

  8. #8
    Not a DeLorean Guru
    Join Date:  May 2011

    Location:  Rochester, NY

    Posts:    2,345

    My VIN:    01049

    The DMC-H fuel pump is dumb. You're dumb for using it. DeLoreans are dumb.

    That filter is NOT dumb.
    -Mike

    My engine twists my frame.

    1981 DeLorean, Carb LS4 swap completed
    1999 Corvette, cam/headers/intake manifold, 400 rwhp
    2005 Elise, stock
    2016 Chevy Cruze

  9. #9
    Senior Member
    Join Date:  May 2011

    Location:  Norton, MA

    Posts:    783

    My VIN:    767 (3.0L EFI/EDIS)

    I have a replacement pump part on the way. I'm sure it'll work fine and I'll never have any problems ever again.

    -- Joe

  10. #10
    Senior Member
    Join Date:  Aug 2018

    Location:  Virginia

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    My VIN:    1623

    Quote Originally Posted by jangell View Post
    I pulled the pump this morning and applied 12v and ground to the connector. Instead of whirring like a motor, it clicks like a solenoid. I'm guessing that means it's dead.

    At least my filter looks reasonably clean, with just a bit of captured debris.

    IMG_1918.jpg

    Thanks!

    -- Joe
    How old was the pump? How many miles on it?
    DMCF rebuild 2008, Stage II, Eibach

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