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Pressure Testing a fuel tank

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  • Pressure Testing a fuel tank

    Can anyone tell me the proper procedure for pressure testing a fuel tank?

    Thanks.

    Brian

    1985 Grady White 204

    http://w3.mivlmd.cablespeed.com/~brianm/
    Brian[br]St. Leonard, MD

  • #2
    Never even seen it done... I hope someone can let us in on this because thats another thing on the to-do list.


    Slidell, LA 1993 Mako 261B - Temperance

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    • #3
      If I remember correctly, you just have to cap off two of the three ports and use the third to apply 2 to 3 psi of air and see if it holds. I just want to make sure I do it right the first time.

      BTW - Great job on the site! []

      Brian

      1985 Grady White 204

      http://w3.mivlmd.cablespeed.com/~brianm/
      Brian[br]St. Leonard, MD

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      • #4
        Yeah that makes sense. Its a metter of what to use to cap the ends off and what to use to apply the pressure. I have a vacuum gauge, but would have to get a cheapo pressure gauge.


        Slidell, LA 1993 Mako 261B - Temperance

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        • #5
          Yes that would be fine. No more than 5psi tops. That's what my buddy Foy does when he builds fuel tanks for Funny Cars or Dragsters. They are built of thinner alum and smaller of corse.

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          • #6
            Yep, NO MORE than 5 psi. Cap and fill with the air. If you have a plumber for a friend, they have all the parts you need for waste and gas line work. I never did do mine but I thought alot about it[:I]. I couldn't bring myself to look for trouble. I was already way over budget[!].

            1985 Mako 21 B 2003 200 HP Mercury SW Classic
            2003 Boston Whaler 255 Conquest w/ twin 200 HPDI\'s. MA & ME

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            • #7
              Mist-Rest,

              You should know that the words "boat" and "budget" don't belong in the same sentence! [][][]

              Brian

              1985 Grady White 204

              http://w3.mivlmd.cablespeed.com/~brianm/
              Brian[br]St. Leonard, MD

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              • #8
                SSSHHHH! You wouldn't want my wife to hear that would you?

                1985 Mako 21 B 2003 200 HP Mercury SW Classic
                2003 Boston Whaler 255 Conquest w/ twin 200 HPDI\'s. MA & ME

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                • #9
                  I sure would have checked it. I read a story a couple of years ago where a guy installed a new tank, only to find out the dang thing leaked. It was all foamed in too.

                  Just Remember "Just 'cause it's new, doesn't mean it's worth a damn"

                  You can quote me. HeHe

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                  • #10
                    Cap everything off and apply 3 lbs of pressure and it should hold for 20 minutes, if not it is leaking. When I built my new tank, I had to fix about 20 tiny pinhole welds (found them with soapy water)as it was my first attempt at welding aluminum with a wire feed gun. After I fixed the last one I made double sure by leaving pressure for one hour and it held.

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                    • #11
                      Got to the auto parts store and get a freeze plug with the nut on the end for the fill hole. I don't remember the size, try some different ones. For the vent I used an intake manifold cap with a hose clamp (in those "HELP section" blister packs) . Lube these up with plumber's grease so you get a true seal as you tighten them down. The pressure gauge manifold can be assembled from air tool stuff at Home Depot and goes into your fuel supply or pickup. T fitting, cheap low pressure gauge, shut off valve, union and whatever male nipple your compreesor runs. All of this is 1/4 npt. Plug your compressor into the nippple on the manifold and open it up, it takes a while to build 3lbs of pressure in a large tak. When you get there close the valve, uncouple the compressor and check all your fittings with soapy water. Let it sit a few days, but remember, changing temps are gonna make the pressure rise and fall. You just want to be sure it doesn't fall to zero...
                      \'87 261 200 yamis[br]\'86 Actioncraft 130 yami[br]Palm Harbor,Fl

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                      • #12
                        Good imfo Pete. I have used those exact pieces in the past.

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