AN Fittings Leak !! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

6600DURAMAX · 12-17-2011, 11:01 PM

Man, does anyone else have issues when assembling AN fittings. I just assembled my fuel lines and one of the fittings leak. It seems to be leaking at the swivel not the section that gets inserted into the hose (if that makes sense) . Then the small allen set screw )for the fuel pressure gauge leaks) it has pipe sealant and I have it super tight and it still seeps

Why all these problems with these fittings?

Marv D · 12-18-2011, 10:09 AM

Whos fittings. I've seen a couple of leaks when using a mix of Russell / Aeroquip fittings / hose, but I typically stick with all Aeroquip haven't had any leaks anywhere.
Having a 'fitting' leak at the swivel is pretty unusual, as is the NPT leak!

vin63 · 12-18-2011, 11:24 AM

X2 - which fitting type and brand are you using? Like Marv, I rarely see leaks from the swivel on typical application. I use the cutter type of hose ends (XRP), and sometimes if people don't get the hose in straight, it will leak at the hose-fitting union.

However, if you are using these fitting on the fuel system for a diesel, the pressure of the fuel system can easily exceed the PSI rating of a typical AN assembly...even the crimp style. Is this for a lift pump assembly before the CP3?

mbgmike · 12-18-2011, 11:44 AM

x3 we use to sell just about every brand of fitting. Aeroquip had to lower their prices some to compete but they are excellent quality. if you stick with the name brands you should not have a problem unless its faulty. if you do alot of hoses i would reccomend getting a Koul Tool.

ProStreet68SB · 12-18-2011, 01:31 PM

Use jegs fittings and jegs line and have never had any issue.

6600DURAMAX · 12-18-2011, 10:10 PM

The fittings I used where no name from EBAY imagine that I tried to save $20 and they leak! I am going to try to use some more tread sealant on the npt one and maybe jsut get another straight fitting if it continues. I am using the black fiber wrapped hose and it is for a gasoline engine.

I will remember to buy name brand ones next time that is for sure. I do have the koul tool but it is at the other house 150 miles away. I do however like the black fiber wrapped hose instead of the stainlesss hose, it seamed to assemble easier.

ont_guy_38 · 12-18-2011, 10:30 PM

I bought a no name fuel line for my holley and it was a nightmare to get it sealed up. Kicked myself for not spending the extra 30 for a decent one

BigDan3131 · 12-20-2011, 06:13 AM

And those are the reasons not to cheap out on parts. I've been burned once on cheap parts and its enough, don't you agree?

12-17-2011, 11:01 PM	#1
6600DURAMAX Registered User Join Date: Nov 2000 Location: Wheatfield IN, USA Posts: 1,124	AN Fittings Leak !! Man, does anyone else have issues when assembling AN fittings. I just assembled my fuel lines and one of the fittings leak. It seems to be leaking at the swivel not the section that gets inserted into the hose (if that makes sense) . Then the small allen set screw )for the fuel pressure gauge leaks) it has pipe sealant and I have it super tight and it still seeps Why all these problems with these fittings? __________________ 1972 K5 - LS3/408 (595Hp) -6L80e-One Tons with 4.56, 20'' Beadlocks with 37'' rubber, full TMI interior, JL Audio ..... 1971 CREWMAX Build.....at body shop for couple more years

12-18-2011, 10:09 AM	#2
Marv D Registered Truck Offender Join Date: May 2008 Location: hells training ground (aka Ariz) Posts: 3,118	Re: AN Fittings Leak !! Whos fittings. I've seen a couple of leaks when using a mix of Russell / Aeroquip fittings / hose, but I typically stick with all Aeroquip haven't had any leaks anywhere. Having a 'fitting' leak at the swivel is pretty unusual, as is the NPT leak! __________________ Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral.

12-18-2011, 11:24 AM	#3
vin63 It's Better With Nitro Join Date: Apr 2008 Location: Chino Hills, CA Posts: 2,262	Re: AN Fittings Leak !! X2 - which fitting type and brand are you using? Like Marv, I rarely see leaks from the swivel on typical application. I use the cutter type of hose ends (XRP), and sometimes if people don't get the hose in straight, it will leak at the hose-fitting union. However, if you are using these fitting on the fuel system for a diesel, the pressure of the fuel system can easily exceed the PSI rating of a typical AN assembly...even the crimp style. Is this for a lift pump assembly before the CP3? __________________ 1963 C-10: Deluxe-optioned cab, shortbed, fleetside Pontiac 462 ci, Kauffman D-Port alum. heads 4L80E, narrowed sheetmetal Ford 9-inch Tubular front and rear suspension Custom 6-piston front disc and 4-piston rear disc brakes

12-18-2011, 11:44 AM	#4
mbgmike Registered User Join Date: Aug 2005 Location: Pasadena,Tx /Pto Pta DR Posts: 5,415	Re: AN Fittings Leak !! x3 we use to sell just about every brand of fitting. Aeroquip had to lower their prices some to compete but they are excellent quality. if you stick with the name brands you should not have a problem unless its faulty. if you do alot of hoses i would reccomend getting a Koul Tool.

12-18-2011, 01:31 PM	#5
ProStreet68SB The Engine Whisperer Join Date: Sep 2006 Location: Ohio Posts: 770	Re: AN Fittings Leak !! Use jegs fittings and jegs line and have never had any issue.

12-18-2011, 10:10 PM	#6
6600DURAMAX Registered User Join Date: Nov 2000 Location: Wheatfield IN, USA Posts: 1,124	Re: AN Fittings Leak !! The fittings I used where no name from EBAY imagine that I tried to save $20 and they leak! I am going to try to use some more tread sealant on the npt one and maybe jsut get another straight fitting if it continues. I am using the black fiber wrapped hose and it is for a gasoline engine. I will remember to buy name brand ones next time that is for sure. I do have the koul tool but it is at the other house 150 miles away. I do however like the black fiber wrapped hose instead of the stainlesss hose, it seamed to assemble easier. __________________ 1972 K5 - LS3/408 (595Hp) -6L80e-One Tons with 4.56, 20'' Beadlocks with 37'' rubber, full TMI interior, JL Audio ..... 1971 CREWMAX Build.....at body shop for couple more years

12-18-2011, 10:30 PM	#7
ont_guy_38 Registered User Join Date: Jul 2007 Location: Ontario Canada Posts: 1,006	Re: AN Fittings Leak !! I bought a no name fuel line for my holley and it was a nightmare to get it sealed up. Kicked myself for not spending the extra 30 for a decent one

12-20-2011, 06:13 AM	#8
BigDan3131 Registered User Join Date: Jun 2006 Location: Maple Valley, WA Posts: 1,913	Re: AN Fittings Leak !! And those are the reasons not to cheap out on parts. I've been burned once on cheap parts and its enough, don't you agree?



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