Potential Fuel Pressure Regulator Solution
 

Looking into potential alternatives to our NLA fuel pressure regulators.
Here are some photos of tansplanting a later style Delphi regulator to the original LT5 regulator body. So far looking very promising. Next step is machining a retainer ring and drilling and threading several screw holes to hold it together. Then test it out. Will keep everyone here posted as to the results.
http://i540.photobucket.com/albums/g...ps9qqxkhqt.jpg

http://i540.photobucket.com/albums/g...psadpkvgg9.jpg

http://i540.photobucket.com/albums/g...pskiac03w7.jpg

Re: Potential Fuel Pressure Regulator Solution
 

:cheers: Wow

Re: Potential Fuel Pressure Regulator Solution
 

I agree......WOW.....:cheers:

Re: Potential Fuel Pressure Regulator Solution
 

Is the stock one just a press fit?

Re: Potential Fuel Pressure Regulator Solution
 

The stock one is an old school design with a separate diaphragm and valve disk assembly under the vacuum dome.

Re: Potential Fuel Pressure Regulator Solution
 

I think you could just zip tie it in.....lol

I have an old one someone sandblasted if you're looking for ones to test things on

Re: Potential Fuel Pressure Regulator Solution
 

Sure, send it over

Re: Potential Fuel Pressure Regulator Solution
 

The L98 was a bolt in top.. maybe a ring with screws to bolt in..


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Re: Potential Fuel Pressure Regulator Solution
 

Literally just had this issue. Please keep us informed

Re: Potential Fuel Pressure Regulator Solution
 

Retainer ring finished and regulator installed on the fuel rails. Now on to the testing phase. Wish me luck.
http://i540.photobucket.com/albums/g...psksrzkxz0.jpg

http://i540.photobucket.com/albums/g...pshgziy7cl.jpg

Re: Potential Fuel Pressure Regulator Solution
 

Knowing you, luck is not a process component. I have no doubt you've covered all the bases. :-)

Re: Potential Fuel Pressure Regulator Solution
 

Beautiful! Looks like that piece was born on top of a LT5.
Is that my old failed regulator reborn?

Re: Potential Fuel Pressure Regulator Solution
 

Yes, that is your old regulator body. Used it for a noble cause.

Re: Potential Fuel Pressure Regulator Solution
 

A thing of beauty, Phil. Well done.


Jim

Re: Potential Fuel Pressure Regulator Solution
 

IF this works out.. it will be a great solution

Re: Potential Fuel Pressure Regulator Solution
 

Very steam punk. I like it

Re: Potential Fuel Pressure Regulator Solution
 

So Phil, this newer style regulator is set for same FP as the OEM one, correct?

Re: Potential Fuel Pressure Regulator Solution
 

Nice work!!!
Marty

Re: Potential Fuel Pressure Regulator Solution
 

And, it's serviceable with out removing the fuel rails.

Re: Potential Fuel Pressure Regulator Solution
 

I wanted to up the fuel rail pressure to 50 psi for the new motor I'm building so this one is the Delphi FP10016 rated at 350kpa. I will also be testing the Delphi FP10023 you mentioned which is the same body form and rated at 300kpa (43 psi). Will also baseline the the stock regulator to see how they all compare.

Re: Potential Fuel Pressure Regulator Solution
 

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:

http://i540.photobucket.com/albums/g...psrgf5vtvt.jpg

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
http://i540.photobucket.com/albums/g...ps3ruvuuat.jpg

Without vacuum 50 psi indicated
http://i540.photobucket.com/albums/g...pshnzbbkli.jpg

Rebuilt regulator with vacuum 42 psi indicated. No problem controlling the full flow of both fuel pumps.
http://i540.photobucket.com/albums/g...ps5ui3qc09.jpg

Rebuilt regulator without vacuum 49 psi indicated. No problem controlling the full flow of both fuel pumps.
http://i540.photobucket.com/albums/g...psdpetpndj.jpg

And best of all, no leaks!
http://i540.photobucket.com/albums/g...ps2nt3wo1h.jpg

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

Re: Potential Fuel Pressure Regulator Solution
 

Very nice.

Re: Potential Fuel Pressure Regulator Solution
 

Well done Phil I think it looks better than OEM

Re: Potential Fuel Pressure Regulator Solution
 

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

Re: Potential Fuel Pressure Regulator Solution
 

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

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Re: Potential Fuel Pressure Regulator Solution
 

Phil,

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

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

Re: Potential Fuel Pressure Regulator Solution
 

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

Re: Potential Fuel Pressure Regulator Solution
 

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!

Re: Potential Fuel Pressure Regulator Solution
 

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 :thumbsup:

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 :D

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 :thumbsup: :thumbsup:

Re: Potential Fuel Pressure Regulator Solution
 

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.

Re: Potential Fuel Pressure Regulator Solution
 

This is amazing nicely done !! Been frustrated because I wanted to change mine out for the sake of knowing it was working and functioning as it should and had no option. Looking forward to the progress/end result and looking forward to sending mine over if required !!

Re: Potential Fuel Pressure Regulator Solution
 

Count me in also :handshak:

If this works out I am assuming you are shooting for an unmodified Delphi FP Regulator and a MODIFIED Stock FP Regulator body?

Re: Potential Fuel Pressure Regulator Solution
 

If ur fuel pressure checks out, then u know its working.

Re: Potential Fuel Pressure Regulator Solution
 

I am interested in this as well. Moving to a modern device would be great..

Re: Potential Fuel Pressure Regulator Solution
 

No modifications are necessary to the Delphi regulator, only to the stock base.
This particular Delphi regulator design comes in 3 pressure ratings FP10023 300 KPa (43 psi), FP10016 350 KPa (51 psi) and FP10021 400 KPa (58 psi). Note the pressure control range of FP10016 that I used in the above test was almost identical to that of the stock regulator.

Re: Potential Fuel Pressure Regulator Solution
 

How is this working out? Viable replacement?


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Potential Fuel Pressure Regulator Solution
 

Lets hope Phil hasn't redefined 94 Torch Red

Re: Potential Fuel Pressure Regulator Solution
 

Hope ? and happy b day Lee I hope it was a good one. GC

Re: Potential Fuel Pressure Regulator Solution
 

Any updated status on how this is working for you?

Re: Potential Fuel Pressure Regulator Solution
 

Sorry, nothing new to report. Right now focused on completing the cylinder heads for the 427 build. Weather here lately not so great which hasn’t motivated me to get on with this.