Return line - Team Camaro Tech
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post #1 of 10 (permalink) Old Apr 16th, 18, 03:04 AM Thread Starter
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Return line

You guys use a 5/16 return line ? The fitting on the Corvette filter for the return is 5/16. The fittings on my pump that came with the “Tanks” kit is 3/8’s (6AN). Thx

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post #2 of 10 (permalink) Old Apr 16th, 18, 04:28 AM
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Re: Return line

3/8" Use a 5/16 " x -6AN fitting

https://www.summitracing.com/parts/rus-644113

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post #3 of 10 (permalink) Old Apr 16th, 18, 05:24 AM Thread Starter
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Oh , I have that fitting. Ok great, I’m all set. Thanks John.

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post #4 of 10 (permalink) Old Apr 17th, 18, 05:22 PM
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Re: Return line

Are there any concerns with using a QD 640853 vs 644123? It looks like 644123 uses a metal connection as opposed to the plastic on 640853.

Tanks Inc sells a FPR using QD 640853 & 640863 connectors.

Last edited by Titan Uranus; Apr 17th, 18 at 06:12 PM.
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post #5 of 10 (permalink) Old Apr 18th, 18, 02:58 AM
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Re: Return line

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Oh , I have that fitting. Ok great, Iím all set. Thanks John.
LOL ... Nice one Donny !

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post #6 of 10 (permalink) Old Apr 18th, 18, 11:42 AM
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Re: Return line

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Originally Posted by Titan Uranus View Post
Are there any concerns with using a QD 640853 vs 644123? It looks like 644123 uses a metal connection as opposed to the plastic on 640853.

Tanks Inc sells a FPR using QD 640853 & 640863 connectors.
I haven't personally had any issues but I have read about the 640853's coming loose/off and spraying fuel everywhere. The 644123's are a more reliable design IMO.
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post #7 of 10 (permalink) Old Apr 18th, 18, 11:55 AM
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Re: Return line

The diff is one snaps on and you need a line removal tool to take them off and the other screws on with the U nut.

I have used both and have never experienced any problems with either
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post #8 of 10 (permalink) Old Apr 18th, 18, 12:26 PM
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Re: Return line

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Originally Posted by Vega$69 View Post
Do you guys use these to go from 3/8" hard fuel line to AN? Would it be the best thing to use to go from factory lines, feed and return, to a fuel pump, regulator, AN lines etc?

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post #9 of 10 (permalink) Old Apr 19th, 18, 06:10 AM
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Re: Return line

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Do you guys use these to go from 3/8" hard fuel line to AN? Would it be the best thing to use to go from factory lines, feed and return, to a fuel pump, regulator, AN lines etc?
Those fittings are specifically for going from AN to the connector (which is basically a line with a lip on it) on a fuel rail or even the Corvette fuel filter/regulator that most everyone uses.

To go from the factory hard line to AN you would need a compression fitting like this:

https://www.jegs.com/i/JEGS-Performa...10551/10002/-1

That particular one says max 55psi which could be a problem since the Corvette filter/regulator sets pressure at a constant 58psi. I'm not sure of the reasoning for it only being rated for 55 but I suspect it is because it is a compression fitting and they inherently can only handle so much pressure.
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post #10 of 10 (permalink) Old Apr 19th, 18, 06:44 AM
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Re: Return line

Quote:
Originally Posted by gphusker View Post
Those fittings are specifically for going from AN to the connector (which is basically a line with a lip on it) on a fuel rail or even the Corvette fuel filter/regulator that most everyone uses.

To go from the factory hard line to AN you would need a compression fitting like this:

https://www.jegs.com/i/JEGS-Performa...10551/10002/-1

That particular one says max 55psi which could be a problem since the Corvette filter/regulator sets pressure at a constant 58psi. I'm not sure of the reasoning for it only being rated for 55 but I suspect it is because it is a compression fitting and they inherently can only handle so much pressure.
You would need the steel fitting as the aluminum will not work with the higher pressure

https://www.swagelok.com/en/catalog/...t=SS-600-6-6AN

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