Thread sealer for fuel systems

[RoadScholar]

I have fuel tank that requires a reducer bushing to adapt a standard 1/2-20 petcock. The bushing presents a surface to the petcock that rules out the use of the rubber covered petcock washers. I did some Goggling and was pointed in the direction of standard pipe sealing compound, and it worked for almost three weeks.

So it doesn't work.

Can anyone suggest a tape or compound that will reliably seal a fuel system?

 

[comnoz]

I have fuel tank that requires a reducer bushing to adapt a standard 1/2-20 petcock. The bushing presents a surface to the petcock that rules out the use of the rubber covered petcock washers. I did some Goggling and was pointed in the direction of standard pipe sealing compound, and it worked for almost three weeks.

So it doesn't work.

Can anyone suggest a tape or compound that will reliably seal a fuel system?

Regular old Teflon tape is about as fuel proof as it gets. Just wrap lots of it.

 

[ashman]

I have fuel tank that requires a reducer bushing to adapt a standard 1/2-20 petcock. The bushing presents a surface to the petcock that rules out the use of the rubber covered petcock washers. I did some Goggling and was pointed in the direction of standard pipe sealing compound, and it worked for almost three weeks.

So it doesn't work.

Can anyone suggest a tape or compound that will reliably seal a fuel system?

Regular old Teflon tape is about as fuel proof as it gets. Just wrap lots of it.

Yep old Teflon tape works for me been using it for most of my life from taps to fuel taps, airline fittings etc.

Ashley

 

[WZ507]

I have fuel tank that requires a reducer bushing to adapt a standard 1/2-20 petcock. The bushing presents a surface to the petcock that rules out the use of the rubber covered petcock washers. I did some Goggling and was pointed in the direction of standard pipe sealing compound, and it worked for almost three weeks.

So it doesn't work.

Can anyone suggest a tape or compound that will reliably seal a fuel system?

Permatex® Form-A-Gasket® No. 2 Sealant works well for such applications. It's a brown/black goop that air drys and stays flexible indefinitely.

http://www.devcon.com/prodfiles/pdfs/fam_tds_383.pdf

 

[DogT]

I used the 'Aircraft gasket sealer' from permatex and it seems to have worked for me for quite a while. I was using the old EWarts petcocks from '69' with no locking nut or washer. But I wasn't using ethanol either, avgas. I've replaced the old petcocks with modern look-alike at this point, I got tired of trying to find the lever.

 

[CanukNortonNut]

I like using Loctite 567 thread sealant.
Cheers,
Thomas
CNN

 

[concours]

I like using Loctite 567 thread sealant.
Cheers,
Thomas
CNN

+1

 

[gtsun]

My friend Wilson who works on Indians religiously uses this white stuff called PST. I think it is now manufactured by Loctite Inc. I've used it on some oil lines and gas lines and it has always worked long term. I've never bought it because he always has just given me a small amount of it to take home but tomorrow when I see him at the shop I will ask him where he buys it from and post that info. Glenn T.S.

 

[eskasteve]

Aviation grade Permatex is the right product. Here's the Permatex part number and the NAPA info
Permatex Aviation Form-A-Gasket Sealant Liquid
Permatex Part #80019
NAPA Item #765-1210

Yellow Teflon tape is also supposed to be highly fuel resistant. I carry it in my tool kit as the Permatex isn't as portable.

 

[gortnipper]

Yellow Teflon tape is also supposed to be highly fuel resistant.

That is what I have used to good effect.

 

[BritTwit]

+1 on Teflon tape.
Either white or yellow.
Yellow is specifically for sealing natural gas (methane) line fittings, but works fine on gasoline lines too.

 

[bentrod]

 

[Madnorton]

Landrover sump sealant.

 

[Fast Eddie]

+1 on Teflon tape.
Either white or yellow.
Yellow is specifically for sealing natural gas (methane) line fittings, but works fine on gasoline lines too.

That's correct.

Actually the only difference though is that the yellow stuff is thicker.

Both are fine for use on bikes.

 

[bentrod]

+1 on Teflon tape.
Either white or yellow.
Yellow is specifically for sealing natural gas (methane) line fittings, but works fine on gasoline lines too.

That's correct.

Actually the only difference though is that the yellow stuff is thicker.

Both are fine for use on bikes.

I've never had success with either white or yellow teflon tape. It tended to turn to goop when in contact with gas or oil, but that's just been my experience.

Art