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Where to find stock fuel pressure regulator RESOLVED


mk2davis
Junior Member
398/2000


Galant VR-4 org Post #: 1245578 posted 03/14/19 04:57 PM     Remind Me!  Send Private Message   Edit Post      
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


Edited by mk2davis (03/31/19 08:55 PM)

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transparentdsm
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138/2000


Galant VR-4 org Post #: 1245580 posted 03/14/19 05:59 PM     Remind Me!  Send Private Message   Edit Post      
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.



138/2000

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mk2davis
Junior Member
398/2000


Galant VR-4 org Post #: 1245583 posted 03/14/19 06:19 PM     Remind Me!  Send Private Message   Edit Post      
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.

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thomcasey
I ain't no puny human
866/1000


Galant VR-4 org Post #: 1245584 posted 03/14/19 08:16 PM     Remind Me!  Send Private Message   Edit Post      
You can get an Aeromotive AFPR and set it to 37 real easy. Then you are good for the future too.



Thom
866/1000 (PTE 1200's, billet 20g+, DSMLink v3, eagle/ross, .020 over, 272's, GC/AGX Coilovers)


Edited by thomcasey (03/14/19 08:16 PM)

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transparentdsm
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138/2000


Galant VR-4 org Post #: 1245585 posted 03/14/19 09:21 PM     Remind Me!  Send Private Message   Edit Post      
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



138/2000

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gvr4ever
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Galant VR-4 org Post #: 1245587 posted 03/14/19 10:16 PM     Remind Me!  Send Private Message   Edit Post      
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.



1992 Nile black w/sunroof
15xK miles. 2nd owner since 1998

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mk2davis
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398/2000


Galant VR-4 org Post #: 1245588 posted 03/14/19 11:38 PM     Remind Me!  Send Private Message   Edit Post      
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.

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gvr4ever
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Galant VR-4 org Post #: 1245594 posted 03/15/19 12:20 PM     Remind Me!  Send Private Message   Edit Post      
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.



1992 Nile black w/sunroof
15xK miles. 2nd owner since 1998

Posts: 5839 | From: central Indiana | Member Since: 08/06/02 | IP: (77.111.246.248) | Report this post to a Moderator

mk2davis
Junior Member
398/2000


Galant VR-4 org Post #: 1245595 posted 03/15/19 03:19 PM     Remind Me!  Send Private Message   Edit Post      
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).


Edited by mk2davis (03/15/19 03:21 PM)

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belize1334
well bread and nobly conceived
1334/2000


Galant VR-4 org Post #: 1245600 posted 03/18/19 05:33 AM     Remind Me!  Send Private Message   Edit Post      
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.



Roger B. Scott
'91 Belize Green


Edited by belize1334 (03/18/19 07:53 AM)

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JNR
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Galant VR-4 org Post #: 1245619 posted 03/18/19 03:45 PM     Remind Me!  Send Private Message   Edit Post      
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?

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mk2davis
Junior Member
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Galant VR-4 org Post #: 1245640 posted 03/21/19 12:27 PM     Remind Me!  Send Private Message   Edit Post      
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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mk2davis
Junior Member
398/2000


Galant VR-4 org Post #: 1245707 posted 03/31/19 08:54 PM     Remind Me!  Send Private Message   Edit Post      
I'm calling this one RESOLVED, although the upshot seems to be that there is no source for new FPR's. Try and buy your buddy's, or get a AFPR and set it appropriately.

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transparentdsm
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138/2000


Galant VR-4 org Post #: 1245708 posted 03/31/19 09:30 PM     Remind Me!  Send Private Message   Edit Post      
hell yeah, glad you got it up and running dude!



138/2000

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gvr4ever
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Galant VR-4 org Post #: 1245711 posted 04/01/19 08:29 AM     Remind Me!  Send Private Message   Edit Post      
Might be faster to reset your ECU than having it relearn/adjust from too much fuel.

Just a thought.



1992 Nile black w/sunroof
15xK miles. 2nd owner since 1998

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mk2davis
Junior Member
398/2000


Galant VR-4 org Post #: 1245717 posted 04/02/19 02:24 PM     Remind Me!  Send Private Message   Edit Post   
Quoting transparentdsm:

hell yeah, glad you got it up and running dude!




It's been a long time coming, but being too stubborn to stop and having this community to back me up certainly helps!

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