M30 fuel pump question.

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  • Heysüß
    E30 Modder
    • Mar 2010
    • 911

    #16
    So. Back here again.

    Fuel pump works. So cps,relay, and fuse work.
    No clog from pump to fuel filter and no clog to the other side.
    So it flows fine until the last part of the trip.

    From there to the front nothing is coming out and we already blew air through it to make sure it wasn't clogged. Any tips? Am I supposed to give it more time so that the fuel gets there? And if so, how much more time?
    09/1989 325i 4 Door
    +M30 Swap
    +Z3 Steering Rack

    Comment

    • weaksauce
      E30 Addict
      • Apr 2009
      • 550

      #17
      need more info
      you said the pump works.
      does that mean it pumps or it makes noise.

      if it pumps, where does it pump at? the tank? if it is weak it might not have the head pressure to get the flow all teh way to the rail

      give us a little more detail to work with here.

      Comment

      • Heysüß
        E30 Modder
        • Mar 2010
        • 911

        #18
        yes it does pump.

        the fuel makes it to the fuel filter fine, through the filter itself fine. where we get stumped is here: why isn't it making it all the way to the front? How could I check, like you said, to see if the head is weak? (and that's why it's not making it to the fuel rail)

        I did not change anything on this car so far. I just drove it to a friend's house hung out there for about an hour and when i tried to start it, it just wouldn't.

        so this makes me wonder if i should even try to fcuk with the FPR hose configuration the PO set up during the swap. It was running fine for the whole week and a half i drove it.

        the red arrow is the one that comes from the back. we blew air threw it to make sure it wasn't clogged, and it wasn't.

        the back half is where i'm a bit confused. shouldn't the blue be the supply ?

        the crank position sensor seems to be ok as well. no looseness to it when i tried to see if that was the problem.

        any more pictures you guys might need to help out let me know and i'll gladly take some more. thanks for your time!
        Attached Files
        09/1989 325i 4 Door
        +M30 Swap
        +Z3 Steering Rack

        Comment

        • Heysüß
          E30 Modder
          • Mar 2010
          • 911

          #19
          we're checking the head pressure today, but on a side note....

          do you think that it's just not coming on because i'm not giving it enough time to go from the fuel filter all the way up to the fuel rail? As I get desperate I may just fill up the hose from up here until it is full and then attaching it again and then giving it a crank for 10-20 seconds and see if that doesn't do it. any thoughts ?
          09/1989 325i 4 Door
          +M30 Swap
          +Z3 Steering Rack

          Comment

          • weaksauce
            E30 Addict
            • Apr 2009
            • 550

            #20
            red arrow is the supply line form the tank
            jump the relay out and see if the pump will run.

            also check to make sure the spark plugs are firing (this will tell you if the injectors are firing)

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