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Old 10-05-2009, 05:37   #1
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Join Date: Jul 2008
Location: Cape Town South Africa
Boat: Admiral Catamaran 38ft
Posts: 59
Main fuel tank leak

My vessel is fitted with a 30l day tank which is filled from the main tank in the keel. I purchased her from the builder one month after launching however I whenever I am on a starboard tack at +15deg of heel I find diesel in one of the port compartments under the floor boards. After months of searching I finally have establised , by pressurising the tank, that the leak is somewhere near the top one third of the tank. Upon draining and opening the hatch into the main tank I find that the GRP hull serves as the containment vessel. The surfaces are coated with what looks like thick blue gelcoat.

Suggestions as to what I can recoat the inside of this tank with to ensure leak free containment ?

I have attached two pictures for clarity - A view down into the first section of the tank showing the inside contour of the hull and a view into the second tank.
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Old 10-05-2009, 14:24   #2
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Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
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If you purchased this boat from the builder, why are YOU repairing it?
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Old 10-05-2009, 14:45   #3
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Location: Charlotte harbor, FL
Boat: Morgan OI 414
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Maybe you could fill the compartment that the diesel is leaking into with some kind of liquid, perhaps water mixed with a colored dye. That way you may be able to determine exactly where the leak is. I would say you would have to grind the gel coat off down to the fiberglass. Then re-glass and then re-gelcoat. Good luck.
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fuel, fuel tank

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