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Old March 2nd 07, 01:40 PM posted to rec.aviation.homebuilt
Earl
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Posts: 5
Default Sealant for polyethylene fuel tank?

Rob said his tank had developed a leak. That would mean that there had
been gasoline in the tank. I don't think anyone would suggest welding
a used metal tank, how could it be any safer with a plasic one?


Steve in Michigan

On Thu, 1 Mar 2007 22:30:32 -0500, "Morgans"
wrote:


clare at snyder.on.ca wrote

Except RTV is NOT gasoline resistant.


Right.

How about some welding with a pencil torch, and some cut up strips of like
plastic?

The key is to keep the fitting hot enough so the strips of plastic stay
melted onto it, and cools and hardens after the heat is taken away, and
enough heat is also applied to the tank plastic and the strips so that they
toughly melt together.

It is a fine line, getting the tank hot enough to soften, but not melt
through.

The other option that comes to mind is a fitting that is a plate with
threads in it for the fuel line fitting, installed inside the tank and
another plate on the outside the tank, with a gasket on both sides, and
screws holding them all together. That could be done second, if the dreaded
melt-through happened around the fitting. This could be manufactured at
home, if one was a bit handy, and creative.