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Old 04-23-2012, 06:02 AM   #1
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fuel tank leak

I have a fuel tank leak in my 2005 30ft mainship on the port side. about one drop every 10 sec. I can't locate where it is coming from.

Has anyone else out there had any problem with the fuel tanks
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Old 04-23-2012, 07:54 AM   #2
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that is fairly new to have a fuel leak from any kind of corrosion. Did you check to see if there might be a screw in it? Does it leak at all fuel levels (full, 1/4 tank) Did you check all the fitting that come from the tank? Probably a valve that needs some adjustment. IF you can't see it maybe a little cutting may be in order
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Old 04-23-2012, 08:09 AM   #3
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I have been part of the Mainship oewer's group in Yahoo since it's inception.
I don't recall ever reading a post about a leaky tank in one of those models.
As suggested I would check fittings first, then welds, then look for something that may have punctured it.
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Old 04-23-2012, 10:43 AM   #4
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To find leaks I use blue work paper towels. Since its a new tank it might be a fitting or someing easy. Since the tank a so new it might be a poor weld.


Our middle tank slit so I cut an opening 18 X 18 to be able to craw in side. It was very easy in the dark tank to see the slit. I hired a welder who craw in side and weld up the split. Anyway the best fix is on the inside and use heat to burn off the diesel residue. However make sure you get ALL the diesel out before you put any heat to the tank and or try an out side fix.
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Old 04-29-2012, 06:50 AM   #5
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fuel tank leaks

Thanks for the comments.

I drained all fuel out, isolated the tank, and filled the tank with about 8 inchs high of water. Can you believe, it it doesn't leak water.

Any thoughts.
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Old 04-29-2012, 07:36 AM   #6
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Try to plug the vent line and then add a couple pounds of pressure. 3 or4 max. That is what they pressure tested my tanks at and it held for 1 week.
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Old 04-29-2012, 09:07 AM   #7
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Quote:
Originally Posted by jann View Post
Thanks for the comments.

I drained all fuel out, isolated the tank, and filled the tank with about 8 inchs high of water. Can you believe, it it doesn't leak water.

Any thoughts.
My son works for a company that inspects large tanks inside petrochemical plants and tells me diesel can escape from a much smaller hole than water can.
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