And just for the record, YES, I did search before posting a new thread..

I'm getting ready to add a 2-5/8" mech. fuel pressure gauge (that's been sitting in my garage) under the hood of my GTA. I'm going to have a custom line made so that I can place the gauge where I want it, and in order to be sure that I get the line leak-proof, I'm thinking of removing the Schrader valve from the fuel rail & taking it in to the company that's making the line.

The question I have that I didn't find an answer to is this - When I replace the valve into the fuel rail, is there any kind of sealant that I should use, or should that be avoided completely??

Thanks guys!

(Yes, I know that's a big flippin' gauge, but I got it pretty cheap...)

i vote no sealant. a little rubber washer is all that i think you would need.or teflon wraping

Thanks for the reply.

Anyone else want to chime in with their own answer?? (I'd really like to try to get this done today...)

No sealant.

I don't like teflon stuff becomes sometimes fuel eats it!

The auto parts stores have a Loctite-type substance that seals but is fuel resistant. I'd go looking there...

Sorry I can't remember the exact name...

OK, just in case someone finds this thread in their own search, I'm going to mention that when I pulled the schrader valve (which takes a 14mm wrench), it did not appear to have any kind of sealant on it - not even a little O-ring, which I'd expected.

I'll bolt it back together this afternoon after getting the line made, & check for leaks. At this point I'm planning on not using any sealant, since I don't want any of it migrating loose & plugging an injector.

If it turns out that it leaks without sealant, I'll update this thread.

Just for the record, I re-installed the Schrader valve (minus the center) with the stainless line going to the gauge, then went with several of the members of our local F-body group on a fairly-energetic cruise through the mountains. No leaking fuel (that I could determine), & I now have a much better idea of what happens with my fuel system.

So, based upon my limited experience, it appears that 'no sealant' is a valid option.

(As always, YMMV, test it out for yourself, no responsibility, yadda yadda yadda...)