Ducati Monster Forum

I need to use a thread sealing compound of some sort on a metal to metal fitting.  It will be exposed to gasoline.

I looked through the Permatex web site and nothing was mentioned about compatibility with gas.  They just listed oil/diesel/hydro.

My local Napa store was of no help.

I'm looking for tape or liquid... What ever works best. This is for a carb so pressure will be minimum. 

Wouldn't generic red gasket sealent do the job? It's gas proof and I think it'd handle threads

I'm thinking that's  what the PO used. There was a red rubber compound on the threads.... And in my fuel lines.... And in my jets. I've installed an in line filter to help solve the "clogging of the jets" issue.  I'd like to avoid this problem in the future by using something more specific for the need.

This is the only thing I have used:

Permatex Aviation Form-A-Gasket Sealant Liquid
http://www.permatex.com/products/automotive/automotive_gasketing/gasket_sealants/auto_Permatex_Aviation_Form-A-Gasket_No_3_Sealant_a.htm (http://www.permatex.com/products/automotive/automotive_gasketing/gasket_sealants/auto_Permatex_Aviation_Form-A-Gasket_No_3_Sealant_a.htm)


It makes a semi-hard seal that is removable later.  100% gasoline resistant and made specifically for contact with fuels and motor lubricants.

Ah.... I was looking under thread sealing. Not thinking
 about gasket seal. So looks like both of you guys are right.  I wanted to avoid the "rubber" type sealants.

Thanks!  I'll look around for some locally. Or order on line.

Advance has it near me

I hear the yellow teflon tape made for nat gas works for gasoline too.

Supposedly available at Home Depot...

I have never seen that confirmed.  Gasoline is a liquid solvent and NG is neither.  I would want to see that in writing.

Nat gas is a liquid at one temp and a gas at another.

I'd call it both rather than neither. ;)

That's it in writing right there!! [cheeky]
 
A friend of mine emailed me earlier and said the same about the yellow tape. I also read it on a Donzi forum.

Is it also a solvent? 

My understanding is that NG is always a gas at the pressures that are present when used for home plumbing, which is what the yellow tape is for -- am I wrong? 

But again, I wouldn't use anything that doesn't have a specific statement from the maker or cert body saying it can be used for gasoline or fuel oil.  I'm not saying you're wrong, just saying Id err on the side of caution.

You're not wrong.

I'm just reporting what I've heard/read.

I use hylomar on every flange type joint I come across whether it's o-ring or gasket sealed recommended or not. It works for me.

I'm going to try the permatex aviation stuff. There's an Advance Auto a town away

Use a toothpick to apply a tiny thread of it. That's all you need for fine threads.  It will set up in about ten min so screw things in before that.  It gets very tacky after that.

I don't have the link handy but Permatex rtv silicone with the copper is gas proof.  The problem folks have is using too much which squeezes into the tank... Use a tiny bead and igts fine.

The yellow Teflon tape  will seal gasoline.   But tape is subject to installer error and if you get it over the edge of the threaded fitting  strands of it can end up in your jets or oil system depending on where you are using it.  Same with RTV, it can get everywhere in your engine when the excess gets squeezed out when assembling parts. 

I like the old fashioned liquid Permatex too. It's strong enough that if you do get some excess in there it tends to stick and stay and not break off and circulate.   That stuff has been around for 500 years and it's still better than most of the new sealants.

fixed

Permatex Aviation Form-A-Gasket Sealant Liquid

 I'm not familiar with the liquid, but under no circumstance use the stuff in a tube. It is impervious to gas, but it sets up like concrete. Red gasket sealer will be eaten up by gas or oil. The red denotes high temp applications. 600 degrees.