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Fuel pump relay question

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    #16
    153 and 173 are basically the same.

    153 is Motronic 1.1
    173 is M 1.3, but no real difference, they are interchangeable.

    Closing SOON!
    "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

    Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

    Thanks for 10 years of fun!

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      #17
      hmm, maybe a wiring problem? I only switched the DMEs to try to isolate the relay problem, but if neither worked maybe I need to bust out the wiring diagrams

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        #18
        what role could the CPS play in this situation? Would a bad CPS cause the DME to not switch on the fuel pump relay/ignition coil? I'll need to get a lab scope to check it out properly, I'm just wondering if this would be worth my time

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          #19
          No matter what the CPS says, the DME should pump for a second or three when key is initially on.

          Closing SOON!
          "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

          Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

          Thanks for 10 years of fun!

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            #20
            Thanks for the help! I'm gonna go deeper into checking out the wiring from the DME to the relay

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