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Fuel Pump wiring question for engine swap

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    Fuel Pump wiring question for engine swap

    I know most of you have experience with the E30 platform but I am hoping you will be able to help. I have an S52 swapped into my 83' E21 and it turns over with out an issue. But I'm not getting any fuel. I'm having a hard time figuring out how the fuel relay is wired on the E36 harness. I have fully removed the ECU that was controlling the the M10 motor and I am assuming that is my issue.

    Any advice would be grate.

    Thanks

    #2
    Find the E36 fuel pump relay, and see if it's providing power.
    If you don't have it, the ETK is at www.wedophones.com

    The it's just a matter of finding the E21 wire that goes back...

    What are you using for a pump? The E21 never had a proper EFI pump...
    and I forget if it used a low- pressure intank pump in 83.

    t
    now, sometimes I just mess with people. It's more entertaining that way. george graves

    Comment


      #3
      Originally posted by TobyB View Post
      Find the E36 fuel pump relay, and see if it's providing power.
      If you don't have it, the ETK is at www.wedophones.com

      The it's just a matter of finding the E21 wire that goes back...

      What are you using for a pump? The E21 never had a proper EFI pump...
      and I forget if it used a low- pressure intank pump in 83.

      t
      Sorry on the delay been busy at work. But I had sometime to do some testing today. I can provide power to the fuel pump from the relay with a power probe and they turn on, but the relay is not being triggered when the key is turned. This made me think the ecu is might not be turning on. So I looked to see if I was getting a check engine light from so I looked for continuity between ground and the gray wire on the smallest connector. When I turn the ecu on I get a reading on .070. I am not 100% sure on the specs but this does not seam right. I do have power to the green wires on the relay on the passengers side near power block when key is on.

      this is what I used as a guide for the E21 wiring


      the wiring I used for the E36 side of the harness



      Here is my plug and play harness I have created.

      Last edited by pofo; 06-10-2017, 06:15 PM.

      Comment


        #4
        Is there any OBC "Code" on the e21? That might trigger the ignition not to turn on the FB. I had that issue on my '92 e30.

        ETM is your friend- I'd test the stock wires on the e21 ignition and see what is triggering what.

        Here is my ODB2 S52 wiring...might help you out...

        555Garage - Kingston, PA

        '13 BMW e70 X5 35d
        '95 BMW e34 525i
        '92 BMW e30 325i S52 Vert (Quade the Vert)
        '92 Range Rover Classic
        '90 Range Rover Classic
        '89 BMW e30 325i Coupe (The DIRTY30)
        '81 VW MK1 Rabbit Caddy Diesel
        '76 Honda CB550K Cafe/Brat
        '67 Pontiac LeMans
        '24 Model T Depot Hack
        ....And a bunch of Motobecane, Puch, Garelli, Batavus and Honda 49cc-78cc Mopeds...

        Comment


          #5
          Thank issue solved. Ground connection to body was not secured properly

          Comment


            #6
            Originally posted by pofo View Post
            Thank issue solved. Ground connection to body was not secured properly
            As also being a member of the VW MK1 community- we have a saying that I use all the time....

            "What does Coffee, Marriages and Cars have in common?...They all start with GOOD GROUNDS"

            :)
            555Garage - Kingston, PA

            '13 BMW e70 X5 35d
            '95 BMW e34 525i
            '92 BMW e30 325i S52 Vert (Quade the Vert)
            '92 Range Rover Classic
            '90 Range Rover Classic
            '89 BMW e30 325i Coupe (The DIRTY30)
            '81 VW MK1 Rabbit Caddy Diesel
            '76 Honda CB550K Cafe/Brat
            '67 Pontiac LeMans
            '24 Model T Depot Hack
            ....And a bunch of Motobecane, Puch, Garelli, Batavus and Honda 49cc-78cc Mopeds...

            Comment

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