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gas coming out of vent when I stop

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  • gas coming out of vent when I stop

    I have a 2002 tracker pro 17 buit in tank , vented out the side of the boat near the dash , when I stop it releases gas thru the vent , I bought a check valve but want to install it near the vent opening , but don't know how to get to the hose that runs to the vent ?


  • #2
    Re: gas coming out of vent when I stop

    Originally posted by nanferg View Post
    I have a 2002 tracker pro 17 buit in tank , vented out the side of the boat near the dash , when I stop it releases gas thru the vent , I bought a check valve but want to install it near the vent opening , but don't know how to get to the hose that runs to the vent ?
    why not install it where it is easy to get to ? near the through hull vent...in case ya need to service it....
    “Success has many fathers, but failure is an orphan.”
    John F. Kennedy





    sigpic1990 Bayliner 2002 Capri Cuddy /125 Force " Breaking Wind "

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    • #3
      Re: gas coming out of vent when I stop

      Which way would you install the valve?

      So it doesn't burp out? Then how will it vent when you fill the tank?

      So it doesn't burp in? Then how will it vent when you run the motor?

      If it were me I would clean and/or replace the vent hose and/or deck fitting. Then, calibrate the gas gauge vs. the tank capacity and only fill in the required quantity. Sounds like you are just over-filling the tank.
      2009 Starcraft 14' FLSS & Yamaha 25
      2005 SeaDoo GTX 4-Tec 155
      1984 Stingray SVB190SS & Mercruiser 3.0 Liter 140
      1964 Sea Nymph 14R & 1970 Evinrude Sportwin 9.5
      1960 Mulray 100 Dinghy, equipped with Beaver Oars
      1952 Lyman 15' Mid Steer & Evinrude Big Twin 25
      63 Outboards: 1919-2008, representing 11 manufacturers
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      • #4
        Re: gas coming out of vent when I stop

        install it in the 'burp out ' position,... it will only be active if there is a fluid pushing it...
        “Success has many fathers, but failure is an orphan.”
        John F. Kennedy





        sigpic1990 Bayliner 2002 Capri Cuddy /125 Force " Breaking Wind "

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        • #5
          Re: gas coming out of vent when I stop

          But then gas can still come out.
          When will people learn that impellers require regular
          replacement and are not drive it till it pukes items?

          1984 Regal Medallion 195
          3.8 V-6 with the dreaded
          OMC Stringer Drive.
          2003 Avalanche w/Hypertech

          If it ain't fixable - don't break it!

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          • #6
            Re: gas coming out of vent when I stop

            Does this only happen when the tank is nearly full? If so, that is pretty normal. If it doesn't do it with it full, you have a vent hose routing problem. No need to band-aid the real problem.
            1998 Wellcraft Eclipse 24 Cuddy
            Volvo Penta Duo-Prop 7.4L "LK"

            2006 Sun Tracker Party Barge 21
            Mercury 90 4-Stroke FI
            "Common sense is not very common"
            "Failing to prepare is preparing to fail." -- John Wooden

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            • #7
              Re: gas coming out of vent when I stop

              Do not install a check valve in a fuel vent line!!!! Ever!!!! They make special traps to prevent fluid release from overfill. You need to find out what is wrong. Does this only happen for a little while after you fuel, or does it do it all the time? If it only happens after refueling, then you are overfilling the tank. They make all sorts of noise devices and other crap to make you pay attention to the fuel level when refueling. If it happens all the time something is wrong and you have a problem to fix.

              Fuel whistle:

              http://www.*************/product.jsp?...8488&id=848503


              Edit: Regardless of the reason, you are in for some serious fines if law enforcement sees fuel come out of your vent fitting. Stop overfilling/fix problem before you dump any more gas in our water or get yourself a hefty fine.
              1987 Blue Fin S170 Fish & Ski
              Fiberglass questions? Click here!
              The Holy Grail of glue knowledge

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              • #8
                Re: gas coming out of vent when I stop

                It happens with a quarter of a tank , If you fill it with a check valve installed I would assume the gas would breath thru the gas cap . I don't know what would cause this , this was a fix ftom tracker bass pro . but it shows the check valve mounted in kine on the 45 degree rise to the vent outlet, I would assume that would be to keep any gas pressure from shutting off the check valve .

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                • #9
                  Re: gas coming out of vent when I stop

                  Originally posted by nanferg View Post
                  It happens with a quarter of a tank , If you fill it with a check valve installed I would assume the gas would breath thru the gas cap . I don't know what would cause this , this was a fix ftom tracker bass pro . but it shows the check valve mounted in kine on the 45 degree rise to the vent outlet, I would assume that would be to keep any gas pressure from shutting off the check valve .
                  If it happens with a quarter tank you have a problem that needs to be fixed. Whether it is the factory's fault or not is irrelevant at this point. The vent may need to be re-routed or the location of it changed. Vacuum is just as dangerous as pressure. It will not vent from the cap. The cap on our family pontoon boat vents, but that is because it is a combination fill/vent assembly. Installing a check valve so that fuel may not pass through the vent will cause the tank to positive pressurize, leak, and possibly rupture. Installing it the other way will cause it to collapse, possibly rupture, and possibly leak once the vacuum is released. Both scenarios are bad situations and possibly very dangerous. Gasoline is serious stuff, especially on a boat. We become complacent around it because we are exposed to it so regularly. Fix this problem right before it fixes you.
                  1987 Blue Fin S170 Fish & Ski
                  Fiberglass questions? Click here!
                  The Holy Grail of glue knowledge

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                  • #10
                    Re: gas coming out of vent when I stop

                    dont get all jiggy.
                    there is a liquid check valve made to aid in preventing liquid from being discharged from the vent.
                    wont be long most lakes will require closed systems anyway.
                    my seapro also has the tank fill thats vented into the fill. its the only thing I will use anymore.
                    its not uncommon to vent fuel when filling,see it a lot.
                    there is a stick on bucket that can catch and hold about a quart of fuel. uses a suction cup to stick on and you remove it after filling.
                    its also why any hull manufatured after jan 01 2010 must have a closed fuel vent system like cars have had for 30 years or so.
                    no tech questions by PM, they wont get answered.
                    you have to be trusted by the people that you lie to .

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                    • #11
                      Re: gas coming out of vent when I stop

                      Originally posted by rodbolt View Post
                      dont get all jiggy.
                      there is a liquid check valve made to aid in preventing liquid from being discharged from the vent.
                      wont be long most lakes will require closed systems anyway.
                      my seapro also has the tank fill thats vented into the fill. its the only thing I will use anymore.
                      its not uncommon to vent fuel when filling,see it a lot.
                      there is a stick on bucket that can catch and hold about a quart of fuel. uses a suction cup to stick on and you remove it after filling.
                      its also why any hull manufatured after jan 01 2010 must have a closed fuel vent system like cars have had for 30 years or so.
                      The check valve you speak of is designed to prevent fluid discharge from over filling the tank, not repair poor fuel vent routing. The OP has an actual problem that needs to be fixed.

                      Uncommon or not, spilling gas while fueling is 100% preventable, should not be tolerated, and there is darn good reason the fine is so expensive.

                      The reason for the closed system (evaporative emission controls) is to trap fuel vapor from escaping to the atmosphere EDIT
                      Last edited by ezmobee; June 8th, 2010, 11:06 AM. Reason: insult removed
                      1987 Blue Fin S170 Fish & Ski
                      Fiberglass questions? Click here!
                      The Holy Grail of glue knowledge

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                      • #12
                        Re: gas coming out of vent when I stop

                        This is why I wrote in on this site ,because I want it fixed I really don't need to be called lazy ,threatoned with fines , and so on . My intention is to fix it , if you can't help in how to repair ,1 post will be enough to express your concerns .

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                        • #13
                          Re: gas coming out of vent when I stop

                          At first it sounded like you didn't have a high-enough swan neck on the vent tube. But if it' doing it at a quater of the tank, it maybe something else, perhaps the way the vent is attached to the tank.

                          Simplest modification is to bypass the through hull vent completely, and install a vented cap.
                          A man of constant boat tinkering.

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                          • #14
                            Re: gas coming out of vent when I stop

                            Originally posted by Home Cookin' View Post
                            At first it sounded like you didn't have a high-enough swan neck on the vent tube. But if it' doing it at a quater of the tank, it maybe something else, perhaps the way the vent is attached to the tank.

                            Simplest modification is to bypass the through hull vent completely, and install a vented cap.
                            The vented caps still use the vent line. They just combine the fill and vent into one housing. Unfortunately this won't fix the problem.

                            http://www.***************/webapp/wcs...&ci_sku=112611
                            1987 Blue Fin S170 Fish & Ski
                            Fiberglass questions? Click here!
                            The Holy Grail of glue knowledge

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                            • #15
                              Re: gas coming out of vent when I stop

                              It might if the top of the vent needs to be raised; his is "vented out the side" and in a low freeboard boat that can be close to the top of the tank. I've been there.
                              A man of constant boat tinkering.

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