2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Aftermarket Fuel Pressure Regulator....

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Old Jul 24, 2007 | 02:15 AM
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Exclamation Aftermarket Fuel Pressure Regulator....

OK, since i lost all my info about doing this i need your guys' help....

i bought an Aeromotive FPR and it comes with no fittings, the one's needed to fit onto the FPR are -6 AN fittings, now, what size is the existing fuel line?, i was told 5/16 but was i mistaken?...

needless to say, any help and guidance installing this will be GREATLY appreciated!...
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Old Jul 24, 2007 | 04:27 PM
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anyone!?..
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Old Jul 26, 2007 | 09:39 PM
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does ANYONE have ANY suggestions or tips on installing an aftermarket fuel pressure regulator!?..
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Old Jul 26, 2007 | 09:42 PM
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Yes, the FPR fittings are -6 AN, but they are SPECIAL ones.
Check the hole, and it should be chamfered?
If so, you need -6 AN *flare* *o-ring* fittings to go into the FPR itself.

Yes, the stock lines are 5/16".

Adding such an aftermarket FPR is not easy.
It gets expensive due to all the AN fittings and especially if you go with AN SS hose.


-Ted
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Old Jul 27, 2007 | 01:34 AM
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Originally Posted by RETed
Yes, the FPR fittings are -6 AN, but they are SPECIAL ones.
Check the hole, and it should be chamfered?
If so, you need -6 AN *flare* *o-ring* fittings to go into the FPR itself.

Yes, the stock lines are 5/16".

Adding such an aftermarket FPR is not easy.
It gets expensive due to all the AN fittings and especially if you go with AN SS hose.


-Ted
chamfered?, the hell is that!?..

the fittings i need off the FPR are -6 AN, but since i'm getting an M12 x1.5 barb fitting for the end of the fuel rail, couldnt i get the -6 AN fittings and another fitting for the end of that to adapt to the 5/16 fuel line?...

from the rail to the FPR, the other line goes BACK to the rail, or where does that one go?...
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Old Jul 27, 2007 | 02:06 AM
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From: n
Originally Posted by Archangels
chamfered?, the hell is that!?..
There's a machined bevel on the edge?


the fittings i need off the FPR are -6 AN, but since i'm getting an M12 x1.5 barb fitting for the end of the fuel rail, couldnt i get the -6 AN fittings and another fitting for the end of that to adapt to the 5/16 fuel line?...
Don't you have a Kouki FC?
The problem is that -6 AN = 6/16th's or 3/8th's.
-6 AN hose is slightly larger than the stock 5/16" pipe size.


from the rail to the FPR, the other line goes BACK to the rail, or where does that one go?...
It sounds like you're trying to run it like the stock system.
The return line (bottom of the FPR) goes to the return pipe back the fuel tank.
The other port of the FPR is just blocked off, since you're not using it.


-Ted
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Old Jul 27, 2007 | 02:17 AM
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yea i did the same thing stupidly .. had a comptech supercharger kit with my acura tl and the comptech FPR was plug in play so i guess i had it good

I bought my -6 Aeromotive FPR and then realized I needed all ss and -6 fittings ... doh lol ---- man was i arrogant
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Old Jul 27, 2007 | 08:49 AM
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Originally Posted by RETed
There's a machined bevel on the edge?



Don't you have a Kouki FC?
The problem is that -6 AN = 6/16th's or 3/8th's.
-6 AN hose is slightly larger than the stock 5/16" pipe size.



It sounds like you're trying to run it like the stock system.
The return line (bottom of the FPR) goes to the return pipe back the fuel tank.
The other port of the FPR is just blocked off, since you're not using it.


-Ted
could i get the absolute closest size to what i need and clamp the absolute **** out of it so it wont slip off?...
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Old Jul 27, 2007 | 10:03 AM
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From: n
Originally Posted by Archangels
could i get the absolute closest size to what i need and clamp the absolute **** out of it so it wont slip off?...
Yeah, that's about the only thing you can do...

-5 AN is an odd side, so it's really hard to find that hose...nevermind the fittings.

Doulble-clamp the -6 AN hose onto the existing 5/16" pipe should be okay.

Good luck!


-Ted
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Old Sep 17, 2007 | 10:15 PM
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From: FWTX
I know this thread has been dead for a while but...
Is there such a thing as a 5/16 to -6 adapter?

Like on a S4 rail, just remove the stock FPR, and run a -6 line to the FPR. Then have the return line clamp on the the stock rubber fuel hose?

Or if such an adapter does not exist.
Rail-barbed fitting-clamped -6 hose-FPR-barbed fitting-clamped stock hose?

Could that work?
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Old Sep 17, 2007 | 10:31 PM
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the thread that goes in the stock S4 rail are 12x1.25.
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Old Sep 18, 2007 | 03:09 PM
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Aeromotive calls it ORB (O Ring Boss)

You can get them from online race stores/Jegs/Summit/etc.

The AN fitting for it isn't tapered like NPT so you need the oring to seal it.
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Old Sep 18, 2007 | 03:20 PM
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Here you go.
http://www.jegs.com/webapp/wcs/store...10002_72420_-1

You'd need an adapter if you wanted to go to 5/16th.

I don't know size conversion but you may be able to get away with
http://www.jegs.com/webapp/wcs/store...10002_52376_-1
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Old Sep 18, 2007 | 03:57 PM
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Sorry to steal the thread but does anyone have any info on the ebay special FPR's? I asked the seller if it referenced the boost with a 1:1 ratio and s/he said it did. Should I bother to try it out (its only $25) or should I go Aeromotive?
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Old Sep 18, 2007 | 04:20 PM
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i wouldnt mess with an Ebay special. a FPR is a vital part for fuel.......
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