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Volvo Penta 5.7 fuel problems

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  • Volvo Penta 5.7 fuel problems

    I went through page after page of the forums after searching and didn't find my particular issue, so here it is-

    2000 Chris Craft Volvo Penta 5.7

    Down to the lake for the weekend, temp 90+, water temp 78 and a bit lower. Boat ran great for 45 minutes, with starting and stopping included. Then after sitting for about an hour it started right up, but when we'd slowly cruised out of the cove and gave it throttle, it died. And would not restart. It cranked fine, but seemed to be starved for fuel. Pulled it back to camp, got tools, and took the carb cover off. Dribbled a little gas into the carb and it ran long enough to use the carb gas, then died again. So I figure fuel delivery problem. Pulled hose from bottom of separator/fuel pump and it was full. Pulled hose from carb and it was empty. Tried cranking it and no fuel out of hose. Pulled the separator and it was about full, dumped it and filled with new fuel. Tried cranking again- no go. Pulled the fuel line from carb again and back-filled it to the pump. Engine started right up and ran great while we played. Went back to camp and and ran around again later and it ran great. Next morning it wouldn't start until we back-filled the line again. Ran perfect again until after we shut it down again. It sat for 3 hours then wouldn't start again. Even after back-filling it wouldn't go. Let it sit for a couple more hours (I was afraid I'd start throwing things around if I kept at it). It started after filling line again. After this it ran fine the rest of the time.

    I called the resort mechanic and he suggested vapor lock or bad fuel pump. I would think the fuel pump would show up first when really pouring on throttle, not intermittently. Vapor lock should clear up after a whole night, shouldn't it? Son now says it did this to him last summer, but not as bad and only once.

    Where do I start?
    Thanks


  • #2
    Re: Volvo Penta 5.7 fuel problems

    My first thoughts were an airleak on the inlet plumbing somewhere that gets worse or only shows up after hot. But Backfilling helping it start would not seem to be a fix for that.

    Maybe the pump starts sucking air and gets hot, maybe backfilling helps that by cooling it down somehow from the outlet side?

    Have you checked the fuel tank venting? If it is not venting well then maybe by the time you try all the fixes the vacuum build up is relieved somewhat and the back filling helps balance out the pumping.

    I am just spitballin' some at the moment on your perplexing problem, but it seems to me the problem is on the inlet side somehow, or the pump itself has a problem internally.
    1991 HydroSwift 2200 Cuddy Volvo Penta 570/DP
    1980 Glastron SSV167 90HP Mariner

    Comment



    • #3
      Re: Volvo Penta 5.7 fuel problems

      One of the check valves are sticking in your pump, replace the pump and make sure you have a good filter in front of it.
      '76 Bayliner T1750
      Aq130D, 280
      Work in progress
      http://s301.photobucket.com/albums/n...anx1/bayliner/

      Flybridge restore thread
      http://forums.iboats.com/showthread.php?t=456072

      This one has reevits
      http://forums.iboats.com/showthread.php?t=550380

      Comment



      • #4
        Re: Volvo Penta 5.7 fuel problems

        Thanks sqbtr, I also tend to think it is the pump which is bad, but looking at Maclin's post reminded me that the first 2 times it did this was just after refilling the tank on the water. I'll probably order a pump later today, but how do I check the tank venting?

        Comment



        • #5
          Re: Volvo Penta 5.7 fuel problems

          Open the fuel cap
          '76 Bayliner T1750
          Aq130D, 280
          Work in progress
          http://s301.photobucket.com/albums/n...anx1/bayliner/

          Flybridge restore thread
          http://forums.iboats.com/showthread.php?t=456072

          This one has reevits
          http://forums.iboats.com/showthread.php?t=550380

          Comment



          • #6
            Re: Volvo Penta 5.7 fuel problems

            Pulled the separator and it was about full, dumped it and filled with new fuel.
            NEVER do that, and dirt or contamination in the filter will get into the clean side of the filter, just by the act of turning it upside down and back right side up.
            You might want to pull the pump and filter assembly remove the filter and look to see if the screen in the inlet of the pump is covered with debris.
            Since your pump is electric, you don't have check valves in the pump.

            Another thing you can try when it stops, is to pull the fuel pump relay, jump the 30 and 87 terminals with a jumper wire and see if the pump will run (engine off) and listen to see if it fill the carb.

            Attached Files
            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



            • #7
              Re: Volvo Penta 5.7 fuel problems

              My bad, see what happenss when you assume. Disregard my fuel pump advise.
              '76 Bayliner T1750
              Aq130D, 280
              Work in progress
              http://s301.photobucket.com/albums/n...anx1/bayliner/

              Flybridge restore thread
              http://forums.iboats.com/showthread.php?t=456072

              This one has reevits
              http://forums.iboats.com/showthread.php?t=550380

              Comment



              • #8
                Re: Volvo Penta 5.7 fuel problems

                I got the fuel pump off, but am having trouble getting the two brass nuts at the bottom end loose. Isn't the filter you've mentioned there? I don't want to break the pump in case it's still good, and I definitely don't want to break the housing. My manual says to put a wrench on the other end of the pump and then try the nuts, but I put alot of muscle into it with no result and I'm afraid it will break off.

                Also, while looking at what new pumps cost, the list here on Iboats shows a different pump for my year and model than what is on it now. I have a 3858261 and the list here (http://www.iboats.com/Volvo-Penta-El...view_id.269847) shows a 3857650. Which do I use?

                Comment



                • #9
                  Re: Volvo Penta 5.7 fuel problems

                  Until you post either the full model number or the serial number of your engine, there is no way for anyone to give you an exact answer.
                  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



                  • #10
                    Re: Volvo Penta 5.7 fuel problems

                    Sorry, it's a 2000 Volvo Penta 5.7 GS

                    Comment



                    • #11
                      Re: Volvo Penta 5.7 fuel problems

                      Thought I would chime in with my 2 cents worth. I have a 5.0 GL (similar to yours). If you check the fuel pump and all is well, check to see if you have water in the tank. When you removed the fuel filter, did you pour it into anything to see if water separated out? I had an intermittent problem with mine, similar to your problem. I had some water in the tank and I could get the motor to run sporadically until the filter finally filled up (swelled up) with water and nothing would happen.

                      The fuel filter/water separator is meant to block water from coming in. Therefore, it the pump works (as per the above posts) yet nothing comes out, check the fuel separator to see if water has gotten inside and swelled the filter that block the water.

                      Hope this helps
                      Portsmouth, VA
                      1999 Wellcraft 200S, Volvo 5.0GL (changed to NEW GM 5.7) SX-M
                      "A boat is a hole in the water into which you throw money." I have thrown my share and am really enjoying it!

                      Comment



                      • #12
                        Re: Volvo Penta 5.7 fuel problems

                        Interesting ...I had EXACTLY the same problem this past week with my 1997 Cobalt 252, 7.4GI (fuel injected engine ...). Did lots of reading and found out that just about all gasoline sold in the US now contains Ethanol (mostly E10 or E15., meaning 10% to 15% ethanol). Marina's are suppose to buy (and sell) only 100% gasoline, but most are independent and buy their gas from jobbers, who will blend the gas with ethanol (disclosure varies by state). While there are some benefits to having an ethanol blend, the major disadvantage in marine use is that ethanol, being a strong polar solvent, has a high affinity for water. There is a very good chance that you have some amount of water in your gas. This explains why your engine idles fine, because without a load the fuel pump pulls top layer of gasoline through the system. First line of defense before you start tearing apart fuel pumps etc. replace the fuel-water separator filter, it's simple. Use a 6 micron filter! Volvo Penta pn 3862228. The Sierra brand and others tend to be 10 micron and won't do as good a job. I needed to replace my fuel filter twice, the same day, before the boat ran normal again. While you're at it, mix in an ethanol fuel stabilizer product such as STA-BIL or LUCAS. My BMW likes TECHRON by Chevron.

                        Hope this helps.

                        Comment



                        • #13
                          Re: Volvo Penta 5.7 fuel problems

                          I always use stay-bil in the boat and the motorcycle. I've started using the marine version in the boat.

                          Having water in the gas would make the boat not run, but woudn't make the pump stop pumping. I had a friend who used to mechanic for a boat racing team come and look at it. He said probably the fuel pump, though a slightly kinked hose from the pump to the carb may also be a contributing factor. He disregarded the vapor lock theory.

                          DonS's testing would be difficult, as in testing the problem on the water is inpractical (when it does quit, and doesn't restart, then what?). Testing it for failure with muffs in the driveway I couldn't get it to quit on me.

                          So I'm replacing parts starting with the kinked fuel hose. Then I'll work my way down to the hose from the tank, which has fuel. I already checked both fuel filters and will change out the water separator.

                          Thanks for the advice and I'll check back in as the project goes along.

                          Comment



                          • #14
                            Re: Volvo Penta 5.7 fuel problems

                            " ... but looking at Maclin's post reminded me that the first 2 times it did this was just after refilling the tank on the water."

                            My bet is still water in the fuel. STA-BIL offers many different products but the red fuel stabilizing product is NOT what you want, or need, for solving water-in-fuel problems. Read the label, check out their product line and FAQ's at http://www.goldeagle.com/brands/stabil/default.aspx. Pick the one that is specifically formulated for water removal in ethanol blended fuels.

                            Wishing you success.

                            Comment



                            • #15
                              Re: Volvo Penta 5.7 fuel problems

                              I just experienced the same problem (2006 5.7 GXI)and was told that the coating of the fuel pump was being chipped away by the ethanol in the gas and stopping/reducing flow. If you check the fuel filter you may see tiny black flakes that are the lining chipping away. I had the pump replaced and it is running fine. According to my mechanic, it is a known problem and Volvo has sold over 200 pumps this year and is in a dispute with the manuf. of the pump.

                              Comment


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