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  • Steven
    Forum Sponsor
    • Dec 2012
    • 2305

    #26836
    Does it matter if I have the right color relay?

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    • kronus
      R3V OG
      • Apr 2008
      • 13000

      #26837
      nope, as long as it's a typical 4-pin, a relay is a relay

      does the pump itself buzz when you turn the ignition on? can you check for voltage?

      are your fuel lines backwards
      cars beep boop

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      • Steven
        Forum Sponsor
        • Dec 2012
        • 2305

        #26838
        Originally posted by kronus
        nope, as long as it's a typical 4-pin, a relay is a relay

        does the pump itself buzz when you turn the ignition on? can you check for voltage?

        are your fuel lines backwards
        No it doesn't buzz and how do you check voltage with the rubber gromits around the wires? And I have the fuel lines disconnected now so that's irrelevant

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        • Vivek
          attention whore/retard/bitch
          • Oct 2011
          • 6167

          #26839
          Lol as soon as you get this working you're gonna have a gas fountain. Is there no nut or anything on the wires you can poke a multimeter on?
          The first car I ever rode in was an e30

          Originally posted by Cabriolet
          Wish you the best and hope you don't remember anything after 10pm.



          1992 Mauritiusblau Vert
          2011 Alpinweiss 335is coupe

          2002 540i/6 Black/Black
          2003 GSX-R 750 (RIP)

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          • kronus
            R3V OG
            • Apr 2008
            • 13000

            #26840
            Originally posted by Steven
            No it doesn't buzz and how do you check voltage with the rubber gromits around the wires? And I have the fuel lines disconnected now so that's irrelevant
            pull the plug at the fuel pump and stick a voltmeter across the pins
            cars beep boop

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            • Steven
              Forum Sponsor
              • Dec 2012
              • 2305

              #26841
              Okay no power at the fuel pump

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              • Steven
                Forum Sponsor
                • Dec 2012
                • 2305

                #26842
                No power at the c101 either for the green violet wire

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                • kronus
                  R3V OG
                  • Apr 2008
                  • 13000

                  #26843
                  cars beep boop

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                  • Steven
                    Forum Sponsor
                    • Dec 2012
                    • 2305

                    #26844
                    No power to the fuse either ahhh

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                    • Steven
                      Forum Sponsor
                      • Dec 2012
                      • 2305

                      #26845
                      So here's what I've got going on.
                      No fuel
                      Checked power at the relay pump and fuse nothing
                      Figured out that the red wire coming into the relay is getting power but when you turn the car over the green violet isn't. Changed the relay with 3 different ones.

                      Now I'm onto sensors. Is there any sensors anywhere that could stop it from giving it power?

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                      • PorscheH6
                        Wrencher
                        • Aug 2008
                        • 242

                        #26846
                        I had a bad crank sensor on my s38. Without a signal the DME wouldn't ground the fuel pump. Does anyone know if stevens car has a similar system?

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                        • e30partsguy
                          Banned
                          • Oct 2012
                          • 173

                          #26847
                          Originally posted by Steven
                          So here's what I've got going on.
                          No fuel
                          Checked power at the relay pump and fuse nothing
                          Figured out that the red wire coming into the relay is getting power but when you turn the car over the green violet isn't. Changed the relay with 3 different ones.

                          Now I'm onto sensors. Is there any sensors anywhere that could stop it from giving it power?

                          check your ignition switch.

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                          • Steven
                            Forum Sponsor
                            • Dec 2012
                            • 2305

                            #26848
                            So the main relay isn't giving power to the red/white wire which gives power to the green violet. The relay is fine we've tried 3 different ones in it

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                            • PorscheH6
                              Wrencher
                              • Aug 2008
                              • 242

                              #26849
                              Ok this is what happened after I swapped engines in my e34.

                              It would crank but get no fuel to the rail. I checked voltage at the relay and only the constant on side had power. I checked voltage at the fuel pump and got nothing. Also got 0v at the fuel pump fuse.

                              I chased the problem for what seemed like forever but I finally tested the cps. No continuity. Turns out the harness was damaged. Fixed it up and the car fired.

                              I only mention this because the symptoms seem similar

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                              • Steven
                                Forum Sponsor
                                • Dec 2012
                                • 2305

                                #26850
                                Originally posted by e30partsguy
                                check your ignition switch.
                                Why would that be bad if it worked perfectly a month and a half ago?

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