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    #1

    Pressure building in fuel tank

    Group have a problem with pressure building in fuel tank in my 90
    Wagon. I had this in my old tank and now in the replacement tank.
    So bad today it was coming out around the screw on gas cap and out the over flow pipe in the body.
    Any ideas?
    Tags: None
    #2
    probably the evap line is crushed/pinched shut or clogged. also, gas should not be getting forced out, only vapors. If gas is coming out... there's other issues.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

    Originally posted by gadget73
    ... and it should all work like magic and unicorns and stuff.

    Originally posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

    Comment

      #3
      +1 on that, the vapor vent valve on top of the tank could also be stuck shut. Unlikely, but if you have to pull the tank out try douching it out with carb cleaner. Pretty sure you will not be able to access it otherwise, its at the very top of the fuel tank.
      86 Lincoln Town Car (Galactica).
      5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

      91 Lincoln Mark VII LSC grandpa spec white and cranberry

      1984 Lincoln Continental TurboDiesel - rolls coal

      Originally posted by phayzer5
      I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

      Comment

        #4
        Ok is the evap line running to anything?
        And is pressure just normal in these tanks??
        I can feel it push air/ fumes out as I unscrew the fuel cap

        Comment

          #5
          Some pressure is normal. Excessive pressure (crack open the cap and it hisses for more than 5 seconds) is not normal. The evap line goes to the charcoal canister under the battery and then to a solenoid behind the battery on the inner fender then to the intake manifold.

          Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
          rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

          Originally posted by gadget73
          ... and it should all work like magic and unicorns and stuff.

          Originally posted by dmccaig
          Overhead, some poor bastards are flying in airplanes.

          Comment

            #6
            It goes out to the canister through a fitting on top of the tank that works almost exactly like a PCV valve. Thats the thing I mentioned that could be stuck if the evap lines aren't smashed. Could be that you can get in there to unhook it and shoot some carb cleaner in the hose, or maybe just apply vacuum to the system at the canister end of things to un-stick it.
            86 Lincoln Town Car (Galactica).
            5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

            91 Lincoln Mark VII LSC grandpa spec white and cranberry

            1984 Lincoln Continental TurboDiesel - rolls coal

            Originally posted by phayzer5
            I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

            Comment

              #7
              Gadget
              Thanks
              So these lines run down the pass side frame?
              And just pull vaccum. from
              The line and see if it pull up gas to it or ?

              Comment

                #8
                pressure and vent lines are on the passenger side.

                find the vent line where it connects to a rubber line near where the front upper control arm mounts on the frame. See if you can pull vacuum, or if it seems like you're just pumping from an open line. If it pulls vacuum quickly, there is a blockage somewhere in the line between the pump and the tank. If it just seems like its doing nothing, then its not blocked. It won't pull fuel, the vapor connection is to the very top of the tank, above where the fuel level sits.
                86 Lincoln Town Car (Galactica).
                5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

                91 Lincoln Mark VII LSC grandpa spec white and cranberry

                1984 Lincoln Continental TurboDiesel - rolls coal

                Originally posted by phayzer5
                I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

                Comment

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