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    Fuel tank anti-siphon valve-gctid819230

    Chief Alen, heh, there. Not sure if you remember me but I installed a pertronix dizzy in my bayliner 2150 sierra sunbridge with a omc cobra 5.0L. I need some advice.....OUCHÔǪ hate to admit that....Finally got the outdrive shift cables adjusted correctly. found a factory defect and corrected it. shifts great now with little effort. But....took the "ole girl" out and it was hesitating out of the hole. top wot was 4300rpm at 38 mph swinging a 15├ù17. SoooooÔǪtook a look at the fuel and the carb. It was a 6 year old rebuilt carb but I pulled it anyways. Then decided to pull some fuel out of the tank because it smelled pretty varnish-ee, know what I mean? Made me think of day old stale beer cans.... Inline fuel filter was a little black but not plugged. So I when I put my little electric fuel pump on the fuel line, I got 2.5 gallons out and the fuel stopped flowing???? HUH?? I blew on the fuel inlet hose with 20 psi and nothing. Nothing would pass, so increase pressure to 60 psi. and it feels/sounds like the air is passing into tank pickup tube at the bottom of the tank.

    So Looks like the problem is in the "check valve" hose barb that is located on the top of the tank that goes into a 90 degree fitting. Is that really a check valve??? Is the check valve suppose to prevent fuel from coming out or going in?? Doesn't make any sense to me. Why would you put a steel check valve in a water exposed fuel system???? The rubber hose is about 12" long and rises about 6 inches to the water separator filter. Does it prevent fuel from back flowing into the tank????? Then have I blown the check ball into the pickup tube with compressed air??? Or is it just gummed up and need to be replaced?

    Does it prevent the tank from siphoning out, then how does the pump pull fuel through it? Any suggestions beer influenced or sober would be helpful in understanding what is going on here. Where I would get one to replace the existing one? In automotive we use a check valve to maintain the pressure in the fuel lines to make starting easier but the pump is in the tank and pushes fuel through the valve. These valves are usually plastic and stainless steel, not aluminum that will corrode. Huh???? what is going on here?? why would one install a check valve to keep fuel from coming out of the tank? isn't that what the fuel line is for??? to take fuel out of the tank? Only thing I can figure is that this must be a "political" valve..... you know what I mean, some politician decided that his brother in law needed a business making wrong way check valves?
    1987 Bayliner Ciera Sunbridge 2150.
    May your portapot not tip over in 5 foot seas.......

    #2
    By the way, what is going with the email on this site??? half my message was gone like like a broken anchor.....
    1987 Bayliner Ciera Sunbridge 2150.
    May your portapot not tip over in 5 foot seas.......

    Comment


      #3
      The anti siphon valve located at the fuel tank prevents fuel from draining/siphoning back down into the tank. In other words it keeps your fuel line, filter, and carburetor full of fuel ready to start ya boat. You may have damaged it using 60 psi air pressure, that poor little ani suphone valve doesn't usually see that kind of force. IMO, just replace it and make sure your "inline" fuel filter is a marine approved fuel water separator.
      Dave
      Edmonds, WA
      "THE FIX"
      '93 2556
      Carbureted 383 Vortec-Bravo II 2.0:1 18 1/4x19 P

      The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
      Misc. projects thread
      https://www.baylinerownersclub.org/f...56-gctid789773

      Comment


        #4
        More importantly it keeps fuel from siphoning from the tank should the fuel line start to leak.
        Pat. Sandpoint Ida
        I NEED ANOTHER BOAT!!

        Comment


          #5
          Glad the pm made it back to you.

          Please if that engine has the original fuel hoses replace them .

          Clean every turn in the fuel line, and the passages in the fuel filter.
          Be good, be happy, for tomorrow is promised to no man !

          1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

          '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

          Manalapan N.J

          Comment


            #6
            Good reading for anti-siphon valve, The Hull Truth site.

            http://www.google.com/url?sa=t&rct=j...VQiyZYyG2ByKUg
            Pat says: DO-IT-RIGHT THE FIRST TIME!

            Bayliner 3870 "ALASKA33)
            Twin 350 GM power
            Located in Seward, AK
            Retired marine surveyor

            Comment


              #7
              "Amadaies" post=819262 wrote:
              More importantly it keeps fuel from siphoning from the tank should the fuel line start to leak.
              Good point, the anti siphon will let fuel flow through in the direction towards the engine when vacuum is being applied via the fuel pump. Here's a cutaway of the anti siphon.

              [attachment]39618 wrote:
              image.jpeg[/attachment]


              Attached files

              Dave
              Edmonds, WA
              "THE FIX"
              '93 2556
              Carbureted 383 Vortec-Bravo II 2.0:1 18 1/4x19 P

              The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
              Misc. projects thread
              https://www.baylinerownersclub.org/f...56-gctid789773

              Comment


                #8
                "Chief Alen" post=819263 wrote:
                Glad the pm made it back to you.

                Please if that engine has the original fuel hoses replace them .

                Clean every turn in the fuel line, and the passages in the fuel filter.
                Ok, so I pulled the little pesky critter off. Wife held my feet while I did the job. Had to promise to take her out for dinner to keep her from letting go....

                All seems good, the valve is not sticky, seems to function perfectly. Pulled the 12" hose and it looks great. after the water separator there is a stainless steel pipe to the carb. Pump I was using was a cheap small pump and it failed. Cleaned valve, ordered new pump to drain tank. Gotta wait until we get back from our 6 week "walkabout" to finish job. The 2.5 gallons that I got out before the small pump failed were clean. Ran it through a 5 micron filter. Didn't smell as "varishee" as the stuff I pulled out of the carb. So.... there may be hope for the fuel in the tank. I'm back to suspecting the problem was with the carb that is in process of being rebuilt. [attachment]39640 wrote:
                100_8738.JPG[/attachment] [attachment]39641 wrote:
                100_8739.JPG[/attachment]


                Attached files

                1987 Bayliner Ciera Sunbridge 2150.
                May your portapot not tip over in 5 foot seas.......

                Comment


                  #9
                  Anti-siphon valves are required by Federal Law and the USCG on all permanent fuel tank installation. Use #15 (Brass) calibrated for HP 200 & above and #30 (Aluminum) calibrated for HP below 200. Delivers Coast Guard/industry standard anti-siphon protection on all gasoline-powered boats. Combines anti-siphon protection with a convenient hose barb design. Per Moeller. I learned this the hard way with a brass anti siphon valve installed from the factory on my Robalo with a Yamaha 150. The 150 did pull fuel, but my 8 hp 4 stroke would not.
                  Brett & Elise, Sammy + Wilson
                  New Addition - 2002 Trophy 2002WA FF Optimax 135
                  GO HAWKS!

                  Comment


                    #10
                    My wife would let go :whistle:

                    let us know when you get back from your walkabout.
                    Be good, be happy, for tomorrow is promised to no man !

                    1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

                    '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

                    Manalapan N.J

                    Comment


                      #11
                      Good to know the diff. Hmmm... 5.0L is just above 200HP but still has the aluminum unit. Thinking that I will replace it with the aluminum as it is original equipment and after 30 years seems to be still functioning correctly. thanks for the info!!
                      1987 Bayliner Ciera Sunbridge 2150.
                      May your portapot not tip over in 5 foot seas.......

                      Comment


                        #12
                        Well, we all know why she would let go.... Up in Lebanon Oregon right now. Helping build some fencing for a week during the eclipse for free rent! I'm still looking for a used omc cobra 5.0L outdrive, if you see one for $500 or so let me know.
                        1987 Bayliner Ciera Sunbridge 2150.
                        May your portapot not tip over in 5 foot seas.......

                        Comment

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