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No Voltage to Fuel Pump

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  • #31
    What is the issue that you are currently having since replacing the regulator? Do you have adequate fuel pressure?
    Previous Boat- 1983 Stars and Stripes


    • #32
      Key, engine start or on position only intermittent power to fuel pump.
      When it does energize the fuel pump the pressure is 5si and strong until it is not energized and engine dies.


      • #33
        you probably have to start wire tracing looking for the wire that is broken a plug that is corroded or slightly unplugged.. Looks like a good time to go through it all.. eliminate the easy stuff... parts are costly...


        • #34
          Originally posted by Jackfrost View Post
          Key, engine start or on position only intermittent power to fuel pump.

          try back probing the signal line from the ECU at the relay - assuming its arranged as per a typical EFI controller the ECU would provide the ground signal to the relay coil.

          if that stays grounded when it dies - or in those times youre testing and not seeing power at the pump, that would at least eliminate that as a path to follow.

          otherwise checking the incoming power to the relay, and the connectivity between the relay and the pump connector itself.


          • #35
            My low battery relay comes in 2 days.
            There is a difference in voltages (as noted above) on pin 86 and 30 of the fuel pump relay. Any ideas?
            Last edited by Jackfrost; 06-29-2021, 08:29 PM.


            • #36
              New low battery relay installed.
              2 days of running. Computer has reset itself.
              No more buzzer going off.

              I still believe there is something wrong with the wiring. The boat now only very rarely drops power briefly while running.

              Will keep checking.
              Last edited by Jackfrost; 07-05-2021, 09:05 PM.


              • #37
                Wouldn't.t start today.
                No power to fuel pump... again
                3.3 ohms at fuel pump relay ground wire... pin 85
                Alarm started to go off again.
                "Check Engine"on dash too.

                Any ideas?
                Last edited by Jackfrost; 07-06-2021, 05:42 PM.


                • #38
                  This sounds stupid, but check for faulty main ground by using jumper cable from battery negative to engine block.

                  Sent from my iPhone using Tapatalk
                  97' Regal Commodore
                  94' Glastron 215 SSV (sold)
                  78' Tahiti 455 Berkley Jet (sold)


                  • #39
                    I've been chasing a low fuel pressure issue for months now. I replaced my old Carter fuel pump with a new Mellenium pump ($800) and can only get 40-42 psi. Boat idles fine and runs to 3,000 rpm / 30 mph just fine but will not go past 3,000 rpm. Also, it is fouling plugs (6 of 8) in about 5 hours.

                    The boat doesn't throw any codes.

                    Here is what I've doing next.

                    1) replacing the 20 year old plug wires
                    2) checking the fuel pressure regulator on the fuel rail. Just found out about this one. Thought our boats only had 1 pressure regulator and that was on top of the fuel pump.
                    3) replacing the fuel pump with the old Carter that I still have since it still works

                    I'm open for any other suggestions.
                    2002, X30, L-18, Red Metal Flake (the possessed boat)


                    • #40
                      Update... mechanic friend suggested to change the oil pressure sensor. Seems to have worked. 6 hours in and has started every time. Wow.
                      he said a bad sensor will stop the fuel pump from turning on.
                      Fingers crossed.