Saddle Tank leak
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Saddle Tank leak

  1. #1
    Led
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    Default Saddle Tank leak

    Got a ghost in my shop.

    Walk into shop one day smell old gas...didnt think much about it, got busy working around the house, wife found gas coming out of the drain hole on my Taylor SJ.
    Do an inspection, appears to be one of the saddle tanks leaking, was eating the paint off the floor. So it was a pretty obvious trail. Tank was not completely full but guessing 3/4 full. So i have an idea to were leak should be, no fuel line around "wet" area, guessing tank was rubbing on floor and finally created a thin spot or something.
    Pissed off, yank interior and tank. Filled the tank with water, was advised water is thicker than gas....no leak. Pressurized the tank with air, spray bottle soapy water....nothing.
    Frustrated a little more....filled tank about 3/4 full with gas....let it set for 3 days...nothing...filled the rest of the way to the top. Let it set for a few hours...nothing...drained tank and got to scratching my head.
    The tank has a rear pickup (at the transom) and sending unit, fill neck is 1/3 from front of tank, front of the tank is the vent, boat was level to slightly nose up.
    The only "hose" around the area is the vent hose. About leaking spot is where the vent hose is connected to a check valve to prevent water going in, then hose to top side.
    Could the vent hose created some kind of suction or vacuum? Maybe check valve is broke?
    The battery is disconnected for winter time, so kids could not of done anything. Fuel pump is electric. I dont want to replace the tank...PITA...measure...order...hope it works.
    I am not completely sold on putting the tank in and running it. Thought about smearing some JB Weld in the areas that look iffy and run it. Planning on taking it somewhere to get it pressure tested. Any ideas?
    Also boat has been sitting for months, unmoved, heated shop, thermostat on 45 unless i am out there then i turn it up. Leak occurred a few weeks ago, heater has not been running.

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  3. #2
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    Since you have the tank out, I'd get a rubber stopper, drill a hole in it for an air nozzle, and pressurize it through the fill with about 2 psi of air. Plug the outlet and the vent. Soap it down. If it doesn't leak, it's not the tank, and it's coming out the vent line somehow.

    Bleed your shop tank down to almost nothing (after unplugging it) to do this while minimizing the chance of over-pressurizing your fuel tank. One of those 12 volt compressors for inflatable toys works well too. And ground everything to the same potential for a bit of added safety.

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    Default leak

    Sounds funny but, I to could not find a leak so I got a CAN of Right Guard the powder spray or you can find a can of antiperspirant spray the area down and youll find your leak it will leave a clean trail from where it leaking worked for me. after done sprays right off.
    Slinging Lead on and off the water for over 40 YRS

    82 18' Crusader Tunnel SOLD ,
    00 23' Mako 232 fish killer,SOLD
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  6. #4
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    I did pressurize with air, maybe too many psi's and it closed the leak by stretching aluminum? The deodorant is a good idea. Found a place the would test it, probably going to mess with a little more this weekend


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    Update, spent $20 and had a radiator shop test the tank, sure enough it had a leak, right were I thought, guessing my "at home pressure test" sucked. Going to a bead welded on it and back at it we do.


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    Good deal. Simple problem, easy fix. We all need more of those...

  9. #7
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    true, sure doesnt happen in my shop much, but now I get to decide to redo floor now or later, paint that is. could sand it all down and repaint, maybe a little splatter paint or something. still pondering.

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