Pipe dope for brass gas line connections?

[Greenfrog]

What kind of thread sealer do I use for brass threads where it is exposed to gasoline?? For example, where sediment bulb /shut off connects below tank and on the brass barbs on an in-line shut-off. Teflon? Probably not for gasoline. Or maybe use none.....
Advise please. Thx in advance.
 

[Steve@Advance]

Teflon tape will work, but you have to be very careful not to get any beyond the end of the fitting as it can clog fuel system components.

I like "Permatex Form a Gasket #3". It is gas resistant, and not supposed to clog if it gets in the line, but still, be stingy with it.
 

[guido]

Hello greenfrog,

Yep! Teflon tape it is yellow for gas piping threads,

Guido.
 

[D beatty]

I also use the Permatex Foam a Gasket that's good for gasoline and doesn't set real hard. If the threads are good on fitting I some times use nothing.
 

[504]

Gasoil
 

[WGM]

Teflon tape should not be used in any pipe installation.
 

[jsborn]

[old]

Teflon tape melts in gas so then it can get into the carb and clog things up big time and can then go back to a solid which can make cleaning it out almost impossible
 

[old]

NOTHING. Many things if you try to use them gas sort of eats or melts and then it can end up in the carb and cause major head aches and even cause a carb to need to be replaced
 

[Moonlite37]

Just not needed. Brass threads are very smooth and seal well
 

[Greenfrog]

Yes, just learned that at local ACE hardware store. However we concluded that that kind was for natural gas or LP and not for gasoline and decided not to use it. I think I will use nothing, brass fits good together.
However, all of you who replied here brings up something, in fact might have solved a mystery: last summer I had the 1942 CASE SC into a local implement dealer shop to get carb cleaned and rebuilt. After that, It actually began to run badly and became harder to start. I seeked a second evaluation from another mechanic. he took carb apart and found a gob of something in the intake jet. Wonder if this was Teflon tape?....as they put an inline filter and a brass shut-off inline in the gas line and used Teflon tape. .????🤔🤔🤔
 

[showcrop]

[Mike(NEOhio)]

I needed some sealer for an LP line and got Blue Monster from a plumbing supply. Good for just about anything but Oxygen. Even sealed a bead on a small snow blower tire.
 

[hd6gtom]

Rector Seal-- professional product made for gas, diesel, lp gas, nat gas.
 

[Richard G.]

I use Blue Monster for fuel and water lines. I just keep the stuff from near the end of the male part so it does not get into the line.
Richard in NW SC