mk2davis
(Junior Member)
03/14/19 04:57 PM
Where to find stock fuel pressure regulator

I'm having a heck of a time finding stock/OEM style 37 pound FPR. The dealership says that have been discontinued with no updated reference number. Any aftermarket one I can find is 3 bar/43 pounds or higher, including the one I got from O'Reilly that was application specific (tested at 46 pounds). At least this explains the stumble as boost comes on.

Does anyone have a good source? The pn I was searching for from the dealer was MD124647.

TIA


transparentdsm
(I have to say something dumb Member)
03/14/19 05:59 PM
Re: Where to find stock fuel pressure regulator

I know I have one, not sure if it's good or not though. Car ran fine before I put an aeromotive on and changed a bunch of things.

mk2davis
(Junior Member)
03/14/19 06:19 PM
Re: Where to find stock fuel pressure regulator

Would you be willing to sell it? I found one from a DSM part out, but it is untested.

My car idles fine and seems to run off boost really well, but transition to on boost is not consistent.

Eventually, I know I'll be getting an AFPR, but I can't quite afford to get a logger right now and that seems to be really important to get things right.


thomcasey
(I ain't no puny human)
03/14/19 08:16 PM
Re: Where to find stock fuel pressure regulator

You can get an Aeromotive AFPR and set it to 37 real easy. Then you are good for the future too.

transparentdsm
(I have to say something dumb Member)
03/14/19 09:21 PM
Re: Where to find stock fuel pressure regulator

Quoting mk2davis:

Would you be willing to sell it? I found one from a DSM part out, but it is untested.

My car idles fine and seems to run off boost really well, but transition to on boost is not consistent.

Eventually, I know I'll be getting an AFPR, but I can't quite afford to get a logger right now and that seems to be really important to get things right.





Yeah I'm willing to sell it. Send me a text, 530-208-9548 name is Shane


gvr4ever
(Forever Member)
03/14/19 10:16 PM
Re: Where to find stock fuel pressure regulator

I'd get a adjustable FPR so you can run a higher pressure fuel pump later.

Also, do a boost leak test. Not sure your boost issue is 100% the cause of the FPR your currently running.

I upgraded my fuel pump before I had a FPR and my car ran rich at idle and before boost, but was fine under boost. I don't think I had a boost build problem. I only ran that way for a very short time before I ordered a FPR and it was years ago, so my memory could be fuzzy.


mk2davis
(Junior Member)
03/14/19 11:38 PM
Re: Where to find stock fuel pressure regulator

I did a boost leak test and then swapped out my TB seals. Since then it seems to be pretty good. But I'm getting about 17mpg, and swapping out my Walbro 190 pump for one that flows 125ish seems to help a little bit. I may have an issue with my TPS because the stumble, if it happens, happens at 4k rpm. But it tested good.

Shane, I'll text you in the AM.


gvr4ever
(Forever Member)
03/15/19 12:20 PM
Re: Where to find stock fuel pressure regulator

Double check the base timing too.

I don't know if it's a direct fit or not, but I was thinking the 2G FPR could handle the flow of a 190lph fuel pump.

Most people just go with a good after market FPR.


mk2davis
(Junior Member)
03/15/19 03:19 PM
Re: Where to find stock fuel pressure regulator

I set the base timing about 3 months ago, but once I install a new FPR that is next on my list. I have no reason to think it has changed, but it seems wise. If the car still hesitates with the new FPR and base timing checked, I'm going to set it at about 3* BTDC. I had a phantom knock issue with the original sensor. It has since been replaced and it has gotten better, but without a logger I don't know if timing is being pulled out or what.

Supposedly.... the 1G can handle the 190. Now at 46 psi, the car is getting as much fuel as if it were running 9 pounds of boost, if I understand things correctly.

And I will go with a good AFPR, but my high hp build (375-400 at the wheels) is going to be a long term project(2-4 years).


belize1334
(well bread and nobly conceived)
03/18/19 05:33 AM
Re: Where to find stock fuel pressure regulator

Quote:

Supposedly.... the 1G can handle the 190. Now at 46 psi, the car is getting as much fuel as if it were running 9 pounds of boost, if I understand things correctly.




All things being equal, the flow is proportional to the square root of the pressure drop, so with sqrt(46/37)=1.115, you'll be running about 10% too rich compared to the target value. Given that DSMs run VERY rich on the stock maps (10:1 or so), that would put you in the low 9:1 AFR, which could potentially lead to poor ignition.


JNR
(5 star (English Professor) member Has extensive pop up picture book collection)
03/18/19 03:45 PM
Re: Where to find stock fuel pressure regulator

Do you still have the factory fuel pressure solenoid (forgot what it's called, want to say it's near firewall on pass side) hooked up or bypassed?

mk2davis
(Junior Member)
03/21/19 12:27 PM
Re: Where to find stock fuel pressure regulator

JNR: I believe the fuel pressure solenoid has been bypassed. Do I want it to be bypassed?

Big thanks to Shane for helping me out with this stock FPR. I haven't run a fuel pressure test yet, but the old butt dyno reports good things! My second and third gear pulls are clean and consistent. It's definitely happier, warms up faster, time will tell about economy but I'm very optimistic, and this may have been my hydrocarbon issue when it came to smog time.

One thing that I still notice is that if I just start from a stop normally and then get aggressive in first, it doesn't like to transition. If I start aggressive, no problem. Start normal, no problem. Transition normal to aggressive, not happy. Thankfully, my 2nd gear syncro is crap anyway, and the extra long pause from 1st to 2nd isn't conducive to winning many drag races, or so I've been told.

Of course, the weather has been relatively mild so far, so things may change as the weather does. But right now I'm pretty happy. Next plan is a catch can for the PCV and reconnect the Greddy turbo controller.



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