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Thu Jul 03, 2014 8:52 pm

as the title states, i was looking for something to seal some threads on the new outlet on my fuel tank.

i tapped the center of the outlet bung to accept a brass 5/16 (outlet) fitting. the problem is, i want to be able to remove it if needed, and i can't install it with the fitting screwed into the tank (going into a bus)

none of the permatex stuff i have found seems to be rated for gas

http://www.neverseezproducts.com/threadseal.htm

so, what have you guys used? really want to stay away from teflon tape if i can

Thu Jul 03, 2014 9:27 pm

I used blue loctite before, but I also never took off the fitting afterwards. No leaks though!

Thu Jul 03, 2014 11:56 pm

Gas is thin and slippery...you really want a positive seal with a fiber gasket or aluminum ring, or the like, im not sure thread sealant is the way to go. I may have misunderstood your question.

Fri Jul 04, 2014 12:37 am

Did you tap it with straight threads or tapered? If they're straight, can you bottom the fitting against a copper washer? If they are tapered I'd use the thick yellow teflon tape, though I know you say you don't want to.

Fri Jul 04, 2014 1:58 am

Blue loctite usually works well, and is rated for gas at the necessary level for fuel lines. When dealing with N/A street engines, that is - if you are running a "fuellie," or even a straight methanol racecar, there is a different product that I can't remember the number of, but look up Henkel, or call and ask for a recommendation. Loctite 243 will even seal most turbo fuel injection lines on "gas." (Oh, and it's fine with ethanol blends.)

Fri Jul 04, 2014 3:29 am

Stag sealant has worked well for me. It's safe for petrol and won't 'lock' when it dries out. I always use a tiny bead when re-using copper sump plug washers.

I'm fairly sure it is still around. My tube is 19yo and I can no longer stab a screwdriver in to a gooey bit... :cry:

Fri Jul 04, 2014 5:48 am

esde wrote: Did you tap it with straight threads or tapered? If they're straight, can you bottom the fitting against a copper washer? If they are tapered I'd use the thick yellow teflon tape, though I know you say you don't want to.

tapered threads

Quokka42 wrote: Blue loctite usually works well, and is rated for gas at the necessary level for fuel lines. When dealing with N/A street engines, that is - if you are running a "fuellie," or even a straight methanol racecar, there is a different product that I can't remember the number of, but look up Henkel, or call and ask for a recommendation. Loctite 243 will even seal most turbo fuel injection lines on "gas." (Oh, and it's fine with ethanol blends.)

i thought about using blue loctite. perhaps i will go this route. i have read that the yellow teflon tape falls apart, and i didn't want to run the risk of using it...

Fri Jul 04, 2014 6:07 am

Gasola. It is used for threads when putting gas sta. pumps and piping together.

Fri Jul 04, 2014 8:31 am

Teflon tape is a valid solution... However the bad part is getting onto fitting and getting fitting seated without shredding it....

Yellow or white tape same formula chemically so either will do....

How about plain old hardware store thread sealant... Recommended for almost any type of liquid or gaseous fuels including "gasoline"...

Pretty much thrown my rolls of Teflon tape in trash after finding this product (by brand) ...

Dale

Fri Jul 04, 2014 8:42 am

Ive had this problem on boats before. I always use loctite aviation gasket sealer. has never leaked on me yet.

Fri Jul 04, 2014 9:21 am

bscriver wrote: Ive had this problem on boats before. I always use loctite aviation gasket sealer. has never leaked on me yet.

That stuff can be dissolved by alcohol, so... I would use liquid Teflon.

Fri Jul 04, 2014 10:51 am

nobuggybob wrote: Gasola. It is used for threads when putting gas sta. pumps and piping together.

looks good to me

http://www.gasoila.com/products/pipe-thread-sealants/gasoila-e-seal-thread-sealant.html

bscriver wrote: Ive had this problem on boats before. I always use loctite aviation gasket sealer. has never leaked on me yet.

i had read the same thing on a boat site before posting here. i would think that it would disolve over time

Sat Jul 05, 2014 5:52 am

Gasola Is all you need 8)

Sat Jul 05, 2014 6:14 am

Gasola does work well.

Mon Jul 07, 2014 4:26 am

Loctite 567 teflon thread sealant.
Instant results,and no problems.

Mon Jul 07, 2014 7:47 am

Indian head works excellent for this. No issues with gasoline. Ray

Tue Jul 08, 2014 9:38 am

This stuff is the best. It's on TV so it must be awesome. I use it on the old cracked rubber fuel lines over my exhaust.

Tue Jul 08, 2014 4:06 pm

Permatex Aviation I have used on Fuel lines and fittings for years. You know its good cause its horrible to remove from your hands. Its rated resistant to fuel and time has shown its true.

http://www.permatex.com/products-2/product-categor...uid-detail

Jeff