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Adding An Adjustable Fuel Pressure Regulator To A White Block.


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#1 CAPT_BLOTTO

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Posted 05 January 2012 - 10:40 PM

I'm doing this write up since I can't find very much information on adding an aftermarket fpr to the stock fuel rail. I am using the Aeromotive adjustable FPR. It was available locally and seems to be working pretty good. It uses 3/8" pipe fittings and I would prefer AN but its not the end of the world. http://aeromotiveinc...pass-regulator/ This is all done without any welding.

Now remember whenever working on the fuel system to disconnect the battery and so you don't have a fire or explosions or other bad stuff.

So ingredients:

1. Aftermarket FPR
2. 1/8 and 3/8 pipe taps
3. 19/32" drill bit
4. 11/32" or 'R' drill bit
5. Tubing cutter something like this: http://www.harborfre...tter-92878.html
6. 90 degree 1/8 NPT to male AN-6 fitting
7. 10" length of female AN-6 to female AN-6 fitting braided line. (length will depend on where you place your fitting)
8. 3/8 NPT plug(s)
9. 90 degree female AN-6 to female AN-6
10. 2x straight 3/8 NPT to male AN-6 adapter
11. AN-6 Female to 5/16" compression tubing adapter
12. teflon tape for all the pipe threads
13. utility knife or razor blade
14. file

So the first steps is to prepare the fuel rail. Drill out the old connection where the stock FPR was with the 19/32 drill bit. This can be a little tricky as I have noticed that different fuel rails have it in different spots. Be careful not to dill it out too close to the edge or when you tap it the threads may cut through the fuel rail and you'll have a leak.

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This picture if my first attempt which got too close and cut through.
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Also if you want to get fancy you can use a boring head and get a little more precise with worrying about the drill bit walking.
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Then tap the port with the 3/8 NPT tap and use the 3/8 plug with teflon tape on the threads.

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Next is the return port on the top of the rail I placed it here because n other spots I tried it hit the valve cover or head. So I place it on the top between the 3 and fourth injector to give room for everything. You can probably place it in other sports too its up to you. You may want to file down the lip so you have a nice flat spot to drill or you may have problems.

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Place the 90 degree 1/8" NPT fitting in this hole.
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Now you can reinstall the fuel rail and pee-assemble some of the FPR. I put the necessary plugs, gauge, and the straight 3/8 adapters in the bottom and of the inlets. The braided line ran from the inlet to the 90 on the top of the fuel rail.

Finally the adapter to the return line. Make sure you have the fuel line , braided line and rail all set up before you this step and take your time. Using the pipe cutter to cut the fuel line down to length. Make sure you line if up and go to near the top of the male threads to make sure you have enough length for compressing fitting. As shown in the diagram. You also are going to scrape the black paint off the line to get the fittings on over the lines. Otherwise its a bit of a tight fit. The paint should scrape off pretty easily with a knife.

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Here's some final pictures. Also don't forget to run the vac line stock fpr to the new one. There's two types of fuel rail covers one of the that only clips on the ends (later style I believe?) will be able to go back on and cover the adapters and mess. You also need different adapters depending on where you place the fpr and what one you're using so plan accordingly.

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#2 lookforjoe

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Posted 06 January 2012 - 01:50 AM

Nice write up!

It should say -'96 850, though - no need to go to all this trouble with ME4.4 setup on 97-98 850/x70 :)
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1998 V70 XR M66 PTE6262 BB Built '04 2.3l Block '03 Ported Head EnemY21Cams TurboTuner 710cc Inj, 3" DP back Dual Magnaflow 14834's May 2011 355WHP(@6400rpm) 347WTq(@4400rpm)@22psi Now with LGSpeed Header & Custom Intake Manifold! BIG 31x12x3"FMIC

#3 CAPT_BLOTTO

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Posted 06 January 2012 - 02:05 AM

Yeah mine is a 95 so I went with this setup.




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