Potential Fuel Pressure Regulator Solution

[Jagdpanzer]

First round of testing was very encouraging. Before going to the trouble of pulling the plenum and swapping out the stock fuel regulator I wanted to make sure the rebuilt regulator would control fuel pressure properly and not leak so I hooked it up to a spare set of fuel rails and did some testing with it connected to the car's fuel supply and return lines:



First connected a jumper from the battery + to the fuel pump test connection to run the pumps with out the engine being started.

Tested the stock regulator with and without vacuum being applied

With vacuum 41 psi indicated


Without vacuum 50 psi indicated


Rebuilt regulator with vacuum 42 psi indicated. No problem controlling the full flow of both fuel pumps.


Rebuilt regulator without vacuum 49 psi indicated. No problem controlling the full flow of both fuel pumps.


And best of all, no leaks!


Now on to swapping out the stock regulator and doing some driving tests.

[RussMcB]

Very nice.

[GOLDCYLON]

Well done Phil I think it looks better than OEM

[Roadster]

As always, your work is flawless.....

[Top Toy]

Looks similar to the one Lingenfelter used to make. Nice work!

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[secondchance]

Phil,

If you splice in unit below, you can adjust pressure increase point.

https://www.google.com/search?q=delp...TvtBqEQgjYIyAQ

[Pete]

Originally Posted by Top Toy

Looks similar to the one Lingenfelter used to make. Nice work!

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Very nice Phil.

Sorry Phil.
But this just caught my eye.
Dennis, WOW 468RWHP is that SEA corrected and what were the corrected torque #'s.
Have you taken it to the track 468 RWHP with stock wheels should be running 126 MPH.

Pete

[Top Toy]

Those results were based on Standard corrections. Actual RWHP was higher. Was a cool, dry day which always helps! Torque was about 380, corrected. Last track day was several years and several mods ago. No match for yours!

[Dynomite]

Phil.....I have at least one Fuel Pressure Regulator that has failed and am saving that so I can use a Delphi FP10023 once you have proven the concept.

I assume your machined ring is outside the Delphi flange and if you were to sell those machined rings I could use that as a template to drill and tap threads for the Allen Head machine screws

How did you remove the present Fuel Pressure Regulator Mechanism from the Aluminum Housing so as not to damage the compatibility of the Delphi to that original Fuel Pressure Regulator Housing?

Your research is superb and if this works out and you were to sell the machined rings I am in for at least 3

I will pay a premium if you tell me how deep to tap and provide the screws

All kidding aside (I am not kidding about the machined flanges).....Phil....this is great research and your machining capabilities are the best....

Thank you for all your contributions over the years

[Jagdpanzer]

Cliff,
Thank you for the compliments. Im afraid the retainer ring by itself won’t do you much good. The stock regulator body requires several machining steps to adapt the Delphi FP regulator. Once I’ve finished testing ths one I will be tweaking the machining steps a little to make it easier to reproduce which will likely impact the retainer ring design.