Fuel Bowl Question

[30 Closed Cab PU]

Originally Posted by Jim/GA

No! No teflon tape on the fuel system lines!

The fuel line inside the car (from fuel valve to fuel bowl) uses a tapered tubing end that mates up to a tapered fitting on the fuel bowl. Snug it up and it should not leak. The threads only pull the tapered tubing up against the tapered fitting tighter. The threads themselves do not seal, so there is no need for sealant or tape on them.






While you are in there, replace the fuel line also. You can apply a very light coating of a non-hardening sealant, like Permatex #2, to the tapered fitting before attaching the tubing, if you want, as insurance against a weeping fitting. But you really don't need it.

Hi Jim,


As long as you are careful and do not get shards of the yellow tape in the gas, what is the objection to the yellow gas resistant tape?



I understand the fix it right the 1st time approach, sometimes a person has reasons to try to make the old stuff work.

[Jim/GA]

Originally Posted by 30 Closed Cab PU

Hi Jim,


As long as you are careful and do not get shards of the yellow tape in the gas, what is the objection to the yellow gas resistant tape?



I understand the fix it right the 1st time approach, sometimes a person has reasons to try to make the old stuff work.

I mostly advise against tape because people use the white teflon tape, and then little bits of it find their way downstream and plug things up, causing bigger problems. Most people don't even know of the existence of the yellow tape.

At least the yellow tape is supposed to not dissolve.

On tapered tubing fittings, a thin coat of a non-hardening sealant on the tapered part will usually cover little imperfections on an old, worn, or damaged part. Tape could also do this. But applying sealant or tape to the threads (where most people put it) is not really putting it where it is needed. It needs to be on the tapered sealing surface.

[30 Closed Cab PU]

Thanks Jim, learned a few bits of info.