Tom,
Loktite pipe sealer is Teflon based and I use it extensively for NPT joints in Diesel fuel systems. It is expensive though.
Steve

"Tom Dacon" wrote in message ...

"matt_colie" wrote in message
...
Tom Dacon wrote:
What's your favorite diesel-resistant gasket sealant? This is for the
nitrile gasket on a clean-out port on the top of
a small diesel fuel tank. I wouldn't mind something that worked well for
pipe threads, too.

Thanks,
Tom Dacon

Tom,
Why do you think it needs a sealant in addition to the gasket.
If you are having a distinct problem with the assembly,
there may be some other issue here.
Matt

Matt, I don't actually KNOW that it needs a sealant in addition to the
gasket. The clean-out port is on top of the tank, and the seal would be only
under stress when the boat is operating in a heavy seaway, where the area
might be subject to impact loading from the fuel sloshing in the tank. The
tank's 316L CRES of either 12 or 16 gauge, so flexing is a possibility in
heavy conditions. The dynamic loads are difficult to determine, and my only
other practical way to test it would be to fill the tank, close off all the
plumbing fittings, and invert it. Even then I'd be applying only a static
load.

So I'm thinking that if I could run a small bead of sealant around the
gasket it might help in maintaining a good seal in those circumstances.
Couldn't hurt, might help, and if it does it'll help keep the smell of
diesel out of the living spaces.

Tom