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Username Post: Thread sealant        (Topic#362594)
Johnny468 
"12th Year" Silver Supporting Member
Posts: 825
Johnny468
Loc: Richmond, Va.
Reg: 10-24-08
09-16-20 09:50 AM - Post#2803580    

When installing NPT to AN adapters into a fuel pump, is there some type of thread sealant I can use on the NPT threads beside white teflon paste?

Possibly something more permanent that hardens when it cures?

Seems like the paste always deteriorates and discolors over time when used on fuel fittings.

Thanks,

Johnny



1965 Impala SS
505/4-speed/3.90


 


Rick_L 
Member #409
Posts: 27749
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
09-16-20 10:45 AM - Post#2803588    
    In response to Johnny468

I use teflon tape. Tape or paste, don't apply on the last thread, to keep it out of the fluid flow.



 
IgnitionMan 
Valued Contributor
Posts: 3802

Reg: 04-15-05
09-16-20 10:57 AM - Post#2803589    
    In response to Rick_L

I agree with Rick, completely.



 
Johnny468 
"12th Year" Silver Supporting Member
Posts: 825
Johnny468
Loc: Richmond, Va.
Reg: 10-24-08
09-16-20 11:33 AM - Post#2803590    
    In response to IgnitionMan

So that's the trick, eh? Very interesting.

I've always applied the sealant all the way up to the end of the fitting.

Thanks for the response, I'll give it a try.

Johnny

1965 Impala SS
505/4-speed/3.90


 
dgstarr 
"3rd Year" Silver Supporting Member
Posts: 209
dgstarr
Loc: Portland, OR
Reg: 04-16-13
09-16-20 09:26 PM - Post#2803623    
    In response to Johnny468

I would suggest trying Permatex Aviation Form a Gasket, it has been around for many years and is gasoline resistant. I have used it with success for a long time.

Dave



 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25256
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
09-20-20 08:59 AM - Post#2803875    
    In response to dgstarr

Permatex Aviation Form A Gasket is my preference. I use it on liquid lines and gaskets. Great for coolant and oil sealing.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
IgnitionMan 
Valued Contributor
Posts: 3802

Reg: 04-15-05
09-20-20 10:10 AM - Post#2803881    
    In response to Johnny468

I have worked in the auto and motorcycle industries for a lot of decades, and the best sealer I have found is one that can be used with, or without gaskets.

Marketed under many names, such as Suzuki Seal, Yama-Bond 4, and its manufacturer name, Three-Bond, it seals gaskets (the blue, gray lines of sealer on intake manifold gaskets is this stuff), 1104, 1194, is great stuff.

This is also the gray sealer between bare metal to metal engine cases on motorcycles. It seals water, coolant, oil vacuum, name it. NOTE: It does not work with excessive heat, such as exhaust system joints and junctions.



 


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