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2005 Trophy 2359 hardtop fuel pump issue, maybe. Need some advice, thanks!-gctid805139

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    2005 Trophy 2359 hardtop fuel pump issue, maybe. Need some advice, thanks!-gctid805139

    Hey folks, Long time stalker first time poster here. Great place by the way.

    Well i need some advice. Just bought the boat in early january and started having problems right away. Being a new boat owner some things came up that took some figuring out but for the most part i solved all the causes and am now sorting out all the effects. Had a

    water issue in the fuel tank. Turns out it was coming in from the gas cap, filler housing. Solved the issues by replacing the filler and cap but in the process ran water through the boats fuel system. Ended up changing the injectors cleaning the fuel rails swapping out both

    filters , the water separating filter as well as the main filter on the cool fuel system. Did all the work myself as i am mechanically inclined and well tooled. Boat has been running good till and getting lots of fishing in when yesterday we were out and the boat just died while

    trolling around. Put the gauge on the fuel rail and it read zero, drained the rail a bit with the bypass button and got it to pressurize, ran for a few minutes then died, sputtered out (no back firing just sputtered out). I thinks its either the high pressure or low pressure fuel

    pump that is giving out, maybe time related and or all the water i ran through it. So it has the cool fuel box which has the two pumps and the filter inside, already changed the filter, is it going to be a hard job to replace the pumps? Do i need to take the boat out of the

    water to change it as i was able to change the filter while it was in the water. I keep the boat slipped in salt water in the sf bay area. I priced out the pumps and they dont seem that expensive so i am okay with doing the job. I have already been through the rest of the

    fuel system and this is all that left as far as i can tell. Replaced all the lines that are not high pressure, swapped all the filters. Swapped the barbed one way on the tank, changed the dip tube in the tank. cleaned the high pressure lines and fuel rails, and installed new

    injectors on the motor. So all i can think of is the pumps. Any advice would be great. Oh yeah i was wondering if the water that runs through the cool fuel system would be opened on the boat when i remove the fuel pumps and flood and sink my boat. Again thanks for

    any advice. I will post a follow up to this as i move forward as i know this is good info to have. I might even make a video of changing the filters for other people looking to do the same project. Thanks again.

    Boat info. 2005 trophy 2359 hardtop

    5.0 mercruiser stern drive

    motor serial number 0w344201

    family 5m9xm05.0gme

    date of build apr 2005

    displacement 5.0l

    Post script: Boat had 435 hours on it when i bought it in jan , it now has 529 hours on it. Im using the boat as much as i can,


    #2
    I have almost the same boat. Several suggestions

    1. Get a mercruiser shop manual and the #36 service manual ECM 555 diagnostics, if you don't have one and follow the troubleshooting suggestions.

    2. There are several sensors that can cause problems and different fuse and circuit breakers that interact with the fuel pumps. The manuals really help.

    3. Could be something as simple as someone hitting the kill switch.

    I've never changed the fuel pumps so don't know about water intrusion when changing them out. When you turn the key on do you hear the pumps run? Again, one of the best things I did was get the service manuals and use the troubleshooting procedures. The other thing I did that is helpful was buy the code scanner from rinda technologies TechMate Pro - Scan Tool. Just ask for the correct connector if you order it. It's not cheap but paid for itself in just a couple of uses. Long drive for me to get a mechanic to look at it so I try and do most of the work myself as well. Good luck on finding the problem.
    2005 2359 Bravo III
    Mercruiser 5.0 MPI
    Central CA Coast

    Comment


      #3
      Hmm ECM 555...is this a 5.0 MPI?
      Joon, Kathy, Jaden & Tristan
      Uniflite 42 AC, DD 671N
      93 3058 sold
      92 2855 (day boat)
      91 Fourwinns 205 (lake boat)
      Longbranch WA
      Life is Good

      Comment


        #4
        Have the same boat (2006). Find that one needs to change the water separating fuel filter a lot. (several times a season) so I keep a few on board for that reason.

        Comment


          #5
          Must be using E10 B)

          Mine is 1 per season + 300 hrs
          Joon, Kathy, Jaden & Tristan
          Uniflite 42 AC, DD 671N
          93 3058 sold
          92 2855 (day boat)
          91 Fourwinns 205 (lake boat)
          Longbranch WA
          Life is Good

          Comment


            #6
            YEs its the 5.0 mpi bravo .

            Comment


              #7
              Cool fuel Gen III,

              Fuel rail getting plugged.

              Typical symptoms for a Gen 3 boat stalling especially @ low speeds.

              Mercruiser were smart enough to paint inside the module,paint peeling off, plugging up everything down the fuel line, both pumps, pressure regulator,....

              Also SB on fragile plastic fittings

              https://youtu.be/E3wS96Vl0mw

              https://youtu.be/0ow4jkR0vR0
              Joon, Kathy, Jaden & Tristan
              Uniflite 42 AC, DD 671N
              93 3058 sold
              92 2855 (day boat)
              91 Fourwinns 205 (lake boat)
              Longbranch WA
              Life is Good

              Comment


                #8
                Fern, were you aware of this?
                Joon, Kathy, Jaden & Tristan
                Uniflite 42 AC, DD 671N
                93 3058 sold
                92 2855 (day boat)
                91 Fourwinns 205 (lake boat)
                Longbranch WA
                Life is Good

                Comment


                  #9
                  Yes i read about that a while back. Could be the problem or a combination, not sure, dont think it helped that i pushed way to much water through the motor. At the parts shop they said i should replace the pumps either way. I went down to the slip and ran the motor for a while, no problems at all. They said that could also be a syptom of the fuel pump dying out. Not sure if its the high pressure or low pressure pump, But am thinking about replacing both of them .

                  Comment


                    #10
                    "Ruffryder" post=805285 wrote:
                    Fern, were you aware of this?
                    Just talked to the old owner of the boat and he said both pumps were changed out 2 years ago and they went through the whole cool fuel system back then. So i think it may just be that we ran that much water through it.

                    Comment


                      #11
                      They went thru the whole fuel system meaning they replaced the fuel module with a upgraded one?

                      If you are pursuing in that way, this will be a great time to inspect both canister area,

                      Did you also replace the basket / lower disc?
                      Joon, Kathy, Jaden & Tristan
                      Uniflite 42 AC, DD 671N
                      93 3058 sold
                      92 2855 (day boat)
                      91 Fourwinns 205 (lake boat)
                      Longbranch WA
                      Life is Good

                      Comment


                        #12
                        "Ruffryder" post=805298 wrote:
                        They went thru the whole fuel system meaning they replaced the fuel module with a upgraded one?

                        If you are pursuing in that way, this will be a great time to inspect both canister area,

                        Did you also replace the basket / lower disc?
                        Thats the way i understand it. I already swapped out the fuel filter in the canister and it was clean besides a little crude. After i changed out the injectors i swapped the filter on the cool fuel system and the extra water fuel separator filter as per a recommendation from a boat mechanic. Didnt replace the basket or lower disc. But i plan on it if i decide to change out the pumps. Wondering if i can do the pump swap with the boat in the water, seems like i can access it.

                        Comment


                          #13
                          I would remove the whole module as you seen on video.

                          Or can be done with her floating.
                          Joon, Kathy, Jaden & Tristan
                          Uniflite 42 AC, DD 671N
                          93 3058 sold
                          92 2855 (day boat)
                          91 Fourwinns 205 (lake boat)
                          Longbranch WA
                          Life is Good

                          Comment


                            #14
                            "Ruffryder" post=805307 wrote:
                            I would remove the whole module as you seen on video.

                            Or can be done with her floating.
                            Talked to my buddy who is a boat mechanic, He recomended taking the whole module out. He also said that it is a closed water cooling system( bravo) do that it wont flood the boat. Going to give it a try today to take the module out.

                            Comment


                              #15
                              Failed. To hard to take off the bolt. Have an idea to remove the alternator for better access. Going to give it a whirl tomorrow. Will post a follow up.

                              Comment

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