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Sealing NPT Threads against fuel

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Nick(at)Scholtes1.com
Guest

Posted: Wed Dec 20, 2006 8:16 am Post subject: Sealing NPT Threads against fuel

Kurt,



I'm not a plumber either, but I live on a farm and we end up very often 

becoming "jack of all trades" in some ways! 



I had been trying to find a descent pipe sealant that would work with 

fuel (gasoline or diesel) applications for years and years.  Teflon tape 

just simply does not work, it "melts" from the fuel and gums everything 

up, it's terrible.  I also tried a Locktite product that was supposed to 

be OK with fuels, but I didn't think it worked very well either. 



Anyway, about 10 years ago I found a product that absolutely, 

positively, works absolutely perfect to seal NPT (tapered) pipe threads 

against petroleum products.  It is a thick black graphite paste.  I buy 

it at McMaster-Carr supply company.  If you want to see it, go here:  

http://www.mcmaster.com/    and search for this part number:  4586K8, 

it's called "Key Graphite Paste".



We have overhead fuel tanks to fuel up the tractors and stuff, and there 

are a bunch of joints on the tanks that connect the filter to the hose 

to the valve, etc.  We've been using this graphite paste on these NPT 

fittings for 10 years and it really works, holds up in weather and 

everything, lasts forever.



Best,



Nick



 	  Quote: 	
		  

Time: 06:04:49 AM PST US

From: kurt schrader <smokey_bear_40220(at)yahoo.com>

Subject: Re: 912 Oil Leak - cracked fitting

I had to buy a new gascolator for this too.  I could

only get 3 threads turned into mine with the pipe

fitting to hose coupling.  Thought that wasn't enough

for security and to prevenbt leaks.  I cut the threads

a bit deeper to get more turns in.  Instead the

fitting hit the interior of the gascolator and split

it open.



I've been called a plumber, but....



I have been using teflon paste on the outer threads on

my plane's fittings instead of tape.  Tried blue

colored auto store sealant first (ATV?) but had 7

leaks with it on the first try with fuel.  So far this

has worked and no junk in the lines.  But you must be

careful to only paste the last few threads.



A non-plumber's 2 cents worth.



Kurt S.

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kitfoxmike

Joined: 05 Dec 2006
Posts: 373

Posted: Wed Dec 20, 2006 8:40 am Post subject: Re: Sealing NPT Threads against fuel

I went and resealed all my connections, at the tank, the fuel check at the bottom of the tanks, the header tank connections and used this.  permatex high prefomance tread sealant, item# 56521.  I did this about 1.5 years ago and about 400 hrs.  The connections are still great with no leaks.



kitfoxmike

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smokey_bear_40220(at)yaho
Guest

Posted: Fri Dec 22, 2006 8:15 pm Post subject: Sealing NPT Threads against fuel

Thanks Nick,



And just in case, I have been a good boy (mostly) this

year Nick.  



Merry Christmas to you all too.



I'll add that reference to my KF info.  Next year when

I retire (Mar 10) I intend to redue my fuel system on

my Fox as well as many other upgrades and will try

your graphite paste.



Kurt S.  S-5



--- Nick Scholtes <Nick(at)Scholtes1.com> wrote:



 	  Quote: 	
		   Kurt,

 

 I'm not a plumber either, but I live on a farm and

 we end up very often 

 becoming "jack of all trades" in some ways!

 .............

 Anyway, about 10 years ago I found a product that

 absolutely, 

 positively, works absolutely perfect to seal NPT

 (tapered) pipe threads 

 against petroleum products.  It is a thick black

 graphite paste.  I buy 

 it at McMaster-Carr supply company.  If you want to

 see it, go here:  

 http://www.mcmaster.com/ and search for this part

 number:  4586K8, it's called "Key Graphite Paste".

 

 We have overhead fuel tanks to fuel up the tractors

 and stuff, and there 

 are a bunch of joints on the tanks that connect the

 filter to the hose 

 to the valve, etc.  We've been using this graphite

 paste on these NPT 

 fittings for 10 years and it really works, holds up

 in weather and 

 everything, lasts forever.

 

 Best,

 

 Nick


	


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