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Old 10-26-2016, 09:14 PM   #1
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Stop the leak

I have a Moeller plastic fuel tank in my skiff - fill, vent and sending unit located on top which I believe are leaking rain water. Anyone know of a spray sealant which is impervious to gasoline I can use to seal the connections?
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Old 10-26-2016, 10:03 PM   #2
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I have a Moeller plastic fuel tank in my skiff - fill, vent and sending unit located on top which I believe are leaking rain water. Anyone know of a spray sealant which is impervious to gasoline I can use to seal the connections?
Another product , called Seal-All
Is impervious to gasoline. Comes in a tube.
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Old 10-26-2016, 10:09 PM   #3
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I saw the seal-all along with permatex permaseal but they both come in a tube. I was hoping to find a spray product.
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Old 10-27-2016, 01:24 AM   #4
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I saw the seal-all along with permatex permaseal but they both come in a tube. I was hoping to find a spray product.
There is a spray "sealer" sold for spark plug leads at auto stores. Is that what you are looking for?
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Old 10-27-2016, 06:00 AM   #5
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Are you saying the gasket is leaking? Change the gasket.
Or is a fitting leaking? You can use a wicking Loctite.
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Old 10-27-2016, 06:27 AM   #6
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Sea-All does seal gasoline, you can buy at Home Depot.
It will also glue down small pieces of wood veneer.
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Old 10-27-2016, 06:30 AM   #7
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I have a Moeller plastic fuel tank in my skiff - fill, vent and sending unit located on top which I believe are leaking rain wate.
If fittings or screwed top plate are leaking, then remove, change seal and/or apply gasoline-resistant sealant and refit. I would not place much faith in persuading a spray-on sealant to stick to the waxy plastic that most gas tanks are made of.
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Old 10-27-2016, 06:13 PM   #8
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I'm going to remove the fill flange, pick-up & vent fittings and sender plate from the tank and then reinstall using the seal-all or permatex permaseal product. The flange and fittings have o-ring gaskets which I suspect are the culprit so I'll replace them also. I'd like to use an epoxy cabosil mixture as a sealant but there is too much flexing of the plastic tank and I only see that seal bond cracking/separating over time. I think a flexible sealant is my only option.
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Old 10-27-2016, 06:50 PM   #9
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https://www.amazon.com/AMERIMAX-PROD.../dp/B003R3YRKQ flashmate is pretty amazing stuff - flexible, stays flexible, sticks to just about anything. not sure if it will tolerate other solvents. probably worth a try
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