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470 MCM Mercruiser fuel pump?

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  • 470 MCM Mercruiser fuel pump?

    Took the boat out on Saturday and it would stall during both acceleration and deceleration it would also idle rough and die when trolling. Then it would work fine for 10 minutes. When I got home I checked the fuel filter and it was dry. I'm thinking I need a new fuel pump?
    My next question is how difficult is it to replace the manual fuel pump with an electric?
    I heard that the happiest 2 days of owning a boat are the day you buy it and the day you sell it, glad to say that doesn't apply to me!

    My 1980 Silverline Nantucket 17VBR


  • #2
    Re: 470 MCM Mercruiser fuel pump?

    Ayuh,... I'd sooner think you have a restriction, Upstream from there....
    Any Grease is Better,..... Than No Grease at All.......

    Comment



    • #3
      Re: 470 MCM Mercruiser fuel pump?

      You thinking in the fuel tank? I'll check that, but shouldn't there have been fuel in the filter? It shouldn't be draining back past the pump? The return line is on the other side of the carb.
      I heard that the happiest 2 days of owning a boat are the day you buy it and the day you sell it, glad to say that doesn't apply to me!

      My 1980 Silverline Nantucket 17VBR

      Comment



      • #4
        Re: 470 MCM Mercruiser fuel pump?

        Originally posted by IceWater View Post
        You thinking in the fuel tank? I'll check that, but shouldn't there have been fuel in the filter? It shouldn't be draining back past the pump? The return line is on the other side of the carb.
        Okay, ICEWATER......I'll bite. What kinda carb'ed 3.7 has "The return line on the other side"?

        If you would disconnect the flexible fuel line on the suction side of the mechanical and splice in a temporary fuel supply, you could isolate your problem to correct side of the pump.

        I gotta agree with the 'ol BondO.
        Eddie Petty. #3 Dirt Modified
        Courtland, Virginia
        V-20 Wellcraft
        3.7 470 Mercruiser

        Stumpnocker
        25 Yamaha, 25 Johnson, 25 Evinrude, 9.9 Evinrude, 4 Johnson, 2.5 Johnson

        Comment



        • #5
          Re: 470 MCM Mercruiser fuel pump?

          On top of that... the mechanical fuel pump is not hard to change and not that expensive.. I got a new sierra marine replacement on ebay for about $70.00. For my 470. I would just stick with the mechanical.

          Comment



          • #6
            Re: 470 MCM Mercruiser fuel pump?

            When I look at me carn there is a metal line from the fuel pump to the carb which unbolts to reveal the fuel filter. Directly across from the fuel filter there is a flexible rubber hose that goes back to the fuel filter. Is that rubber hose not a return line? Perhaps I'm confusing the fuel return system on my C15 CAT with a gasoline system?
            I heard that the happiest 2 days of owning a boat are the day you buy it and the day you sell it, glad to say that doesn't apply to me!

            My 1980 Silverline Nantucket 17VBR

            Comment



            • #7
              Re: 470 MCM Mercruiser fuel pump?

              No not a return line, its there in case of pump diaphram failure to direct fuel to dump into carb, not the bilge
              You meet the nicest people at the American Legion.
              "maintenance is always cheaper than neglect"
              "certain parts are USCG approved for a REASON"
              "just because it's in the factory service manual, doesn't mean it's correct"

              Comment



              • #8
                Re: 470 MCM Mercruiser fuel pump?

                Ok, that makes sense. I thought it was a return line because I have only seen a second line used as a return line.

                I'll run the fuel pump tests next time home Ande take it from there. If I do go with a new fuel pump I'll probably just stick with a manual' but I will add a water separater.
                I heard that the happiest 2 days of owning a boat are the day you buy it and the day you sell it, glad to say that doesn't apply to me!

                My 1980 Silverline Nantucket 17VBR

                Comment



                • #9
                  Re: 470 MCM Mercruiser fuel pump?

                  Originally posted by IceWater View Post
                  When I look at me carn there is a metal line from the fuel pump to the carb which unbolts to reveal the fuel filter.
                  IceWater.....you ARE aware that there is another fuel filter inside that little metal can on top of your fuel pump...aren't ya'?
                  Eddie Petty. #3 Dirt Modified
                  Courtland, Virginia
                  V-20 Wellcraft
                  3.7 470 Mercruiser

                  Stumpnocker
                  25 Yamaha, 25 Johnson, 25 Evinrude, 9.9 Evinrude, 4 Johnson, 2.5 Johnson

                  Comment



                  • #10
                    Re: 470 MCM Mercruiser fuel pump?

                    depends on the exact fuel pump used .Some AC type didnt have it.
                    http://www.*****************/parts/si...ercruiser.html
                    this type does
                    Attached Files
                    NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

                    Comment



                    • #11
                      Re: 470 MCM Mercruiser fuel pump?

                      Eddie Petty,

                      I didn't check the filter on the pump, regardless, my original question was whether or not there should be fuel in the filter in the carb? I don't know much about boats at all, that's why I ask. I know a lot about trucks and a lot about 1960's Fords , but boats are very different.
                      No one has answered whether or not there should have durl in the carb filter? I think there should; a boat isn't that different than a 1967 Cougar.
                      I heard that the happiest 2 days of owning a boat are the day you buy it and the day you sell it, glad to say that doesn't apply to me!

                      My 1980 Silverline Nantucket 17VBR

                      Comment



                      • #12
                        Re: 470 MCM Mercruiser fuel pump?

                        There was a TSB saying to remove the carb filter because of restriction.With a filter on the pump and/or a fuel/water sep filter ,it`s all you need.
                        NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

                        Comment



                        • #13
                          Re: 470 MCM Mercruiser fuel pump?

                          Please excuse the spelling, I'm using my BlackBerry and it has a mind of it's own. Durl should be fuel and carn should be carb.
                          I heard that the happiest 2 days of owning a boat are the day you buy it and the day you sell it, glad to say that doesn't apply to me!

                          My 1980 Silverline Nantucket 17VBR

                          Comment



                          • #14
                            Re: 470 MCM Mercruiser fuel pump?

                            Originally posted by IceWater View Post
                            Eddie Petty,

                            I didn't check the filter on the pump, regardless, my original question was whether or not there should be fuel in the filter in the carb?.
                            Yes, there should be fuel in the filter. And in the carb. The answers were that there are other things to check before assuming that the pump is the problem.
                            '86 Glastron Conroy X-19, Merc 170
                            '04 Carolina Skiff J14, 25 hp Mercury
                            sigpic

                            Comment



                            • #15
                              Re: 470 MCM Mercruiser fuel pump?

                              But, isn't the lack of fuel in the carb filter a sign that the fuel is leaking back past the fuel pump? Where else can it go? No signs of leaking.
                              The most common answer on replacing the manual pump with an electric - provided the fuel pump needs replacing - is to just replace it with a manual' so that's what I'll do.
                              I heard that the happiest 2 days of owning a boat are the day you buy it and the day you sell it, glad to say that doesn't apply to me!

                              My 1980 Silverline Nantucket 17VBR

                              Comment

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