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Old 06-01-2020, 10:05 PM   #1
wwirz
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Default Gas Valve Installation - thread sealant recommended?

I am going to install a new gas valve on the underside of the gas tank. Can I use teflon tape on the NPT threads to the tank and little dab of gasket eliminator on the swedged end of the valve? Your recommendation please?
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Old 06-01-2020, 10:11 PM   #2
SteveB31
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Default Re: Gas Valve Installation - thread sealant recommended?

No . No Teflon tape.
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Old 06-01-2020, 10:36 PM   #3
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Default Re: Gas Valve Installation - thread sealant recommended?

I use a dab of Permatex No 3.
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Old 06-02-2020, 04:09 AM   #4
wwirz
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Default Re: Gas Valve Installation - thread sealant recommended?

I thought no tape. Just wanted to be sure. Permatex it is! THanks
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Old 06-02-2020, 08:19 AM   #5
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Default Re: Gas Valve Installation - thread sealant recommended?

Yellow teflon tape or pipe dope. It's a pipe thread. Permatex will make it tough the next time.
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Old 06-02-2020, 10:14 AM   #6
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Default Re: Gas Valve Installation - thread sealant recommended?

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Old 06-02-2020, 10:37 AM   #7
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Default Re: Gas Valve Installation - thread sealant recommended?

Yellow Teflon tape is fine as long as you get it on the treads only. Don't have it where it might get into the gas.
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Old 06-02-2020, 09:27 PM   #8
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Default Re: Gas Valve Installation - thread sealant recommended?

Teflon tape is a mechanics best friend....... for making money
If your the mechanic on your car, it's your worst enemy.
Liquid pipe sealer made for sealing gasoline !
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Old 06-02-2020, 09:37 PM   #9
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Default Re: Gas Valve Installation - thread sealant recommended?

Quote:
Originally Posted by wmws View Post
Yellow Teflon tape is fine as long as you get it on the treads only. Don't have it where it might get into the gas.
Wouldn't it have to make contact with gas if it was needed to be used?

So far I've never had to use anything.
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Old 06-02-2020, 10:31 PM   #10
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Default Re: Gas Valve Installation - thread sealant recommended?

Quote:
Originally Posted by Badpuppy View Post
Yellow teflon tape or pipe dope. It's a pipe thread. Permatex will make it tough the next time.
Permatex #3 doesn't harden. I've undone fitting where I used it years later and no problem.
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Old 06-02-2020, 11:36 PM   #11
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Default Re: Gas Valve Installation - thread sealant recommended?

In another life, I assembled many VW bug engines and the two block halves were sealed with Permatex #3 and,upon disasembly, we used ethanol to wash away the stuff. My concern with Permatex #3 is that it is soluble in ethanol so would the 10% ethanol fuel that we are currently being sold potentially undermine at the sealing effect?
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Old 06-03-2020, 07:22 AM   #12
wmws
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Default Re: Gas Valve Installation - thread sealant recommended?

Quote:
Originally Posted by 1crosscut View Post
Wouldn't it have to make contact with gas if it was needed to be used?

So far I've never had to use anything.
Yellow Teflon tape is fine as long as it is on the threads and not up where it can get into the gas line. I have used it for many years on many applications with no problems.
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Old 06-03-2020, 07:45 AM   #13
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Default Re: Gas Valve Installation - thread sealant recommended?

Permatex Permashield is the ticket.
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Old 06-03-2020, 08:16 AM   #14
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Default Re: Gas Valve Installation - thread sealant recommended?

I haven't used permatex in years, I only remember the old stuff that got dead and hard, for gas I've been using Hilamar, spelling might be off on that, on the 32 to 34 trucks the hydro for the gas gauge is on the bottom of the gas tank, thats the only stuff that kept gas from leaking around the cap screws.
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Old 06-03-2020, 02:10 PM   #15
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Default Re: Gas Valve Installation - thread sealant recommended?

Read the labels, any pipe thread compound that says it's good for gas or diesel (usually in a list of about 40 things), will work fine. I several varieties on my shelf, most are green in color but not all.
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Old 06-04-2020, 04:12 AM   #16
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Default Re: Gas Valve Installation - thread sealant recommended?

I use a product called Gasoila. It is a paste and used in the petroleum industry. It works very well and I have never had a leak using it. Just google gasoila.
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