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Old 01-23-2010, 09:47 AM
El Sea El Sea is offline
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Join Date: Aug 2006
Rep: 36 Posts: 55
Location: St Petersburg, Florida
When you have a compromised fuel tank you tend not to sleep well at night.
I would try to sort out what has caused the problem. The boating environment is very unfriendly to the different metals that are used. The DOE warns of the storage of bio-diesel, the EPA warns of the storage of Ethanol.
I see tanks that have been encased with the foam, this almost aways leads to failure and I see tanks with holes that have been spiked by stray electrical current.

From a cost and safety point of view, off-load the fuel, pull the tank, clean up the mess that is currently hidden and replace the tank.

Good Luck,

Luther Carrier
Absolute Tank Cleaning
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Old 01-23-2010, 05:28 PM
NTGeorge NTGeorge is offline
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Join Date: Jan 2010
Rep: 10 Posts: 15
Location: Darwin
You can get some goop called "Pro-seal" I think that is it's official name. Quite expensive, but is one of the few sealants out there that is Avtur proof so it'll hold back diesel, the avo fellas out there will know it better. They use it to seal the inside of the fuel cells in helicopters and such. I get it to seal fuel gauge units and inspection ports on new tanks that I make for customers.
I would suggest even somthing as simple as cleaning the affected area really well and then pumping a tube of ordinary commercial silicone into the area, to stop water ingress. Then put a fuel bladder in.
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Old 04-20-2017, 10:50 PM
dcapn8 dcapn8 is offline
Join Date: Apr 2017
Rep: 10 Posts: 2
Location: United States
My plan for sealing my tank.

I have the same problem on my '86 Ericson 38-200. The leaking diesel is causing black goo in the bilge. I am going to empty the tank (about 40 gallons) and give the fuel away, then cut an inspection/access hole in the top of the foremost (largest/deepest) part of the tank and then try to clean & scour the bottom weld(s) of the tank. Then I will pour/coat the welds with epoxy, (or fiberglass resin?). Before buying/installing an expensive inspection plate cover I will test the seal with a couple gallons of diesel. If the tank still leaks, I will empty it then cut the top off most of the tank, remove the baffles, and then install a 20 gallon bladder-tank. I will post results here. Wish me luck!
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Old 04-20-2017, 11:02 PM
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Ike Ike is offline
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Location: Washington
Your idea of a test is not a good one. Only a pressure test will tell whether it leaks or not. You need to pressure test it at 3 PSI (no more) Frankly if it is leaking due to corrosion it should be replaced. Trying to repair a leaking tank is an exercise in futility.
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Old 04-20-2017, 11:21 PM
dcapn8 dcapn8 is offline
Join Date: Apr 2017
Rep: 10 Posts: 2
Location: United States

Thanks Ike,
you are probably right to forget trying to repair the tank, but it will be a beast of a job to try to remove it (or just cut the top off of it). So I'll give it a shot at a fix first, (then probably admit that I should have listened to Ike...)
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