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#1 |
Registered User
Join Date: Jun 2012
Location: Hudson wisconsin
Posts: 149
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AN6 fittings with mechanical fuel pump
I recently installed my rebuilt engine and am looking at finishing touches. I bought a Jeg's fuel pump and a straight 1/4 NPT to AN6 fitting. I installed only to find out when I installed it the end that went into the fuel pump stripped out. The aluminum came apart and was leaking when just sitting with out engine running. Threads were gone. I thought about trying to run a tap but since it was fuel related I decided it was best to just replace. I ordered one from Summit to see if it was any different. Look almost identical. Bought a Russel brand fitting also.
I started to finger tighten and found it only went in about 3 threads before it got tight. almost the same as the original. I am using a brass barb hose fitting on the inlet so I installed this and found it went a little further. I cleaned threads as best as possible and the AN fitting only went a little further. The whole threaded portion is approx. 1/2 inch deep and I am only going in about 1/4 inch before it gets tight. Before I throw away another $45 and buy a better brand fuel pump do you have any thoughts or ideas how to make it work better? should I use a non hardening sealer like permatex #2? Or just get it tight and see if it leaks?
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Thanks, Joe 1972 C10 350 Auto |
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#2 |
Registered User
Join Date: Oct 2012
Location: Sugar Grove, Il
Posts: 131
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Re: AN6 fittings with mechanical fuel pump
I had the same sort of problem. Anyone find a solution?
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#3 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: AN6 fittings with mechanical fuel pump
I think the fuel pump is tapped for straight threads like brake lines not NPT. That would explain why the NPT -AN tightens up quickly.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#4 |
Registered User
Join Date: Jun 2012
Location: Hudson wisconsin
Posts: 149
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Re: AN6 fittings with mechanical fuel pump
summit says fuel pump inlet and outlet is 1/4 NPT. Is that not the same size as a 1/4 NPT straight to 6AN fitting?
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Thanks, Joe 1972 C10 350 Auto |
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#5 |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: AN6 fittings with mechanical fuel pump
If it were me, I'd confirm it is not a "close enough" metric thread on either part. Then use a NPT tap to deepen the tapered threads so I could run the fitting in about 75% of its threaded length. Might need to grind the tap off or find a bottoming tap depending on the hole depth. Make sure you use a light, flushable grease on the tap to catch what it can and reverse blow the hole often. By that I mean use a tube extension on your blow gun and push it fully in before triggering the air and keep blowing as you extract it.
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