noob question things to check for long cranking & fire up on 2nd start

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  • 7pilot
    E30 Addict
    • Feb 2009
    • 475

    #16
    Just to clarify:
    The duty of keeping pressure in the lines for ease of starting is done by a check valve in the fuel pump, and not by the fuel pressure regulator .
    This valve may be bad, or the pump is worn out, but works for now.
    Suspects are:
    1, Air leak
    2, partially clogged fuel filters due to sediment in the tank.
    3, weak fuel pump.
    4, dented fuel tank.
    5, Weak ignition .

    m

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    • Morrison
      E30 Addict
      • May 2006
      • 430

      #17
      Well technically the fuel pump check valve and the fpr are both responsible for keeping pressure in the system.....one device on each "end" of the pressurized fuel volume.
      "I think we consider too much the good luck of the early bird and not enough the bad luck of the early worm."
      -Franklin D. Roosevelt

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      • iwantspeed
        No R3VLimiter
        • Dec 2007
        • 3164

        #18
        can the check valve on the fuel pump be replaced?


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        • Mike
          E30 Modder
          • Nov 2003
          • 932

          #19
          Nope, quit being a cheap ass..
          Supatek -noun - your basic know it all

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          • iwantspeed
            No R3VLimiter
            • Dec 2007
            • 3164

            #20
            Originally posted by Mike
            Nope, quit being a cheap ass..

            Fuel pump replaced.

            No improvement.
            Fpr next.


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            • jlevie
              R3V OG
              • Nov 2006
              • 13530

              #21
              Originally posted by iwantspeed
              Fuel pump replaced.

              No improvement.
              Fpr next.
              Don't replace the FPR until you have checked the rail fuel pressure. Since you say the car runs fine and the only problem is hard starts, after running the diagnostics on the fuel system have a shop run a smoke test. Then repair as indicated.
              The car makes it possible, but the driver makes it happen.
              Jim Levie, Huntsville, AL

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