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fuel pump not pumping

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  • #16
    Re: fuel pump not pumping

    There's no doubt the fuel pump was gummed up from sitting without stabilizer, we all agree on that one. However, based on your suggestion of creating a jumper between terminal #87 and #30, I was able to eventually break the pump free and get it working again. At that point, the motor *did* start and run; though it sounded like the starter would not disengage. It wasn't until a few minutes later that it would only start, but then die whenever the key was released from the start to run position. That's what's confusing me, what could have happened in those few minutes to cause this? Is there something we could have done that caused the alternator to fail? If so, I'd sure feel better knowing what it is, so we don't repeat it again.

    Also, doesn't using the jumper between 87 & 30 provide constant power to the pump? In which case, shouldn't the fuel pump continue to run regardless of the alternator and therefore the motor should continue to run?

    Comment



    • #17
      Re: fuel pump not pumping

      Also, doesn't using the jumper between 87 & 30 provide constant power to the pump? In which case, shouldn't the fuel pump continue to run regardless of the alternator and therefore the motor should continue to run?
      With that jumper, the pump should run, even with the ignition key off. It will run any time the battery is hooked up to the engine.
      Don S.

      sigpic

      Please, no PM's (Private Messages) regarding boat/engine problems.
      That is what the forums are for.
      Only forum/moderator issues will be answered in PM's.

      Comment



      • #18
        Re: fuel pump not pumping

        Originally posted by Don S View Post
        With that jumper, the pump should run, even with the ignition key off. It will run any time the battery is hooked up to the engine.
        If that's the case, then [using the jumper] shouldn't the motor run regardless of whether or not the alternator is functioning properly?

        Comment



        • #19
          Re: fuel pump not pumping

          Yes. with the jumper hooked up, it's like running a wire straight from the batteries positive terminal to the pump.

          Are you saying the pump is working for a while then stopping?

          Tested the lines and got 1.65 to 1.67 at the alternator and .02 at the relay.
          Exactly how did you test and get those numbers? Where did you have the test leads of your meter?
          Don S.

          sigpic

          Please, no PM's (Private Messages) regarding boat/engine problems.
          That is what the forums are for.
          Only forum/moderator issues will be answered in PM's.

          Comment



          • #20
            Re: fuel pump not pumping

            Originally posted by Don S View Post
            Yes. with the jumper hooked up, it's like running a wire straight from the batteries positive terminal to the pump.

            Are you saying the pump is working for a while then stopping?

            Exactly how did you test and get those numbers? Where did you have the test leads of your meter?
            The fuel pump is not stopping. Once we got it unstuck, it works as long as the jumpers are plugged in, which is why it's odd that the motor starts but will not stay running.

            It would seem it's either an ignition issue or perhaps the carb.

            I'm not familiar with this carb, but if it has a separate starter and main jet, it would make sense that whatever was gumming up the fuel pump, broke loose and clogged up the main jet. That would explain why the motor ran for a few mins when we first got the pump running again; and now it starts but wont stay running.

            What are your thoughts that?

            As far as testing the alternator, after placing the jumper between terminals 87 & 30 on the relay socket, I had to scrape some paint off the bolt holding the green wire on the back of the alternator and touched it with one lead of the VM, then grounded the other VM lead, while someone turned the motor over.

            Then I did the same by plugging the VM lead into socket #85 [with the jumper still in place] and grounding the other lead while someone turned the motor over.

            Comment



            • #21
              Re: fuel pump not pumping

              Hello. I wanted to see we could get any more suggestions on the above before we have to bring it in to a mechanic. I appreciate all of the help so far. thx.Gabe

              Comment



              • #22
                Re: fuel pump not pumping

                As far as testing the alternator, after placing the jumper between terminals 87 & 30 on the relay socket, I had to scrape some paint off the bolt holding the green wire on the back of the alternator and touched it with one lead of the VM, then grounded the other VM lead, while someone turned the motor over.
                That is not how the test was supposed to be done. The test was supposed to be done with the engine running, not just someone turning it over. Go back and read the test in reply #7.
                Don S.

                sigpic

                Please, no PM's (Private Messages) regarding boat/engine problems.
                That is what the forums are for.
                Only forum/moderator issues will be answered in PM's.

                Comment



                • #23
                  Re: fuel pump not pumping

                  Originally posted by Don S View Post
                  That is not how the test was supposed to be done. The test was supposed to be done with the engine running, not just someone turning it over. Go back and read the test in reply #7.
                  If you read my previous posts, you'd see the issue here now is the engine wont stay running even with the jumper in place. So what now?

                  Comment



                  • #24
                    Re: fuel pump not pumping

                    Have you tried to give it some throttle to keep it running? It's a cold engine, and cold engines don't like low idle speeds till they warm up and the choke opens.
                    Don S.

                    sigpic

                    Please, no PM's (Private Messages) regarding boat/engine problems.
                    That is what the forums are for.
                    Only forum/moderator issues will be answered in PM's.

                    Comment



                    • #25
                      Re: fuel pump not pumping

                      We tried the throttle but still it won't stay running.

                      Comment



                      • #26
                        Re: fuel pump not pumping

                        If I was working on it, I believe I would disconnect the fuel line from the carb, push a hose on the end of the line and run the pump with a jumper and see if you can pump gas into a gerry can. See if the pump keeps pumping or it just runs and nothing coming out.
                        Don S.

                        sigpic

                        Please, no PM's (Private Messages) regarding boat/engine problems.
                        That is what the forums are for.
                        Only forum/moderator issues will be answered in PM's.

                        Comment



                        • #27
                          Re: fuel pump not pumping

                          Originally posted by Don S View Post
                          If I was working on it, I believe I would disconnect the fuel line from the carb, push a hose on the end of the line and run the pump with a jumper and see if you can pump gas into a gerry can. See if the pump keeps pumping or it just runs and nothing coming out.
                          We did that and the pump is working. Any other thoughts?

                          Comment



                          • #28
                            Re: fuel pump not pumping

                            Did you let the pump run for several minutes? Might also try the same test with the relay installed. Just disconnect the green wire from the alternator and hook a jumper wire for the battery to the green wire and see if it will run the pump for 5 minutes or more.
                            Don S.

                            sigpic

                            Please, no PM's (Private Messages) regarding boat/engine problems.
                            That is what the forums are for.
                            Only forum/moderator issues will be answered in PM's.

                            Comment



                            • #29
                              Re: fuel pump not pumping

                              Will give it a try, thanks.

                              Comment



                              • #30
                                Re: fuel pump not pumping

                                To be frank, I'm 40 miles from this boat, It'd save myself and the owner a lot of time and me some trips back and forth if you could give me some additional advice on what to do if the pump does pump for five mins, but the boat still wont start, then what next? ...And if the pump doesn't continue working for five mins, then what do we check after that?

                                I'd greatly appreciate any help you could give. Thanks.

                                Comment


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