fuel pressure regulator
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More Turbo
Joined: Feb 2022
Posts: 656
Likes: 106
From: New Dominion, PE
fuel pressure regulator
Looking for a fuel pressure regulator for my 87 ford f150 5.0L.
F4CZ-9C968-A
I bought one on ebay and it had the wrong plate fitment onto the fuel rail so would not work.
Anyone have one of these? I believe Bosch made the OEM ones.
The one on the truck (walker brand) is dropping fuel pressure when the rig starts turning over down to ~30 making
hard starts. Something amiss with the spring I assume.
thx a bunch.
F4CZ-9C968-A
I bought one on ebay and it had the wrong plate fitment onto the fuel rail so would not work.
Anyone have one of these? I believe Bosch made the OEM ones.
The one on the truck (walker brand) is dropping fuel pressure when the rig starts turning over down to ~30 making
hard starts. Something amiss with the spring I assume.
thx a bunch.
Mountain Pass
Joined: Jan 2005
Posts: 116
Likes: 31
From: Langley B.C.
I wonder if one from any '87 5.0L would work? LMR has an adjustable one for $45 (87 Mustang) that you could dial in your pressure, it looks like it has the same base from the photo compared to your truck one.
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More Turbo
Joined: Feb 2022
Posts: 656
Likes: 106
From: New Dominion, PE
the issue I'm chasing here is the truck exhibits a hard start condition (long crank) when the vacuum line to the FPR is connected. it will eventually start but takes
around 20+ seconds before lighting off. Once running, is fine.
If I disconnect the vacuum line off the FPR, it will start immediately...no hesitation.
I put a new inline high pressure pump (delphi) a few weeks back. pressure at the rail is 38 PSI with key in the ON position (not started). when started with
the vacuum line to the FPR, pressure drops to 30 PSI. from my limited knowledge, this is normal for these trucks. (5.0L).
there is no leaking of fuel from the FPR when the engine is running with the vacuum line off. I ran it for 15+ minutes and watched the nipple ...nothing leaking.
I'm open for other suggestions...
the hard starting is not normal. IMHO.
around 20+ seconds before lighting off. Once running, is fine.
If I disconnect the vacuum line off the FPR, it will start immediately...no hesitation.
I put a new inline high pressure pump (delphi) a few weeks back. pressure at the rail is 38 PSI with key in the ON position (not started). when started with
the vacuum line to the FPR, pressure drops to 30 PSI. from my limited knowledge, this is normal for these trucks. (5.0L).
there is no leaking of fuel from the FPR when the engine is running with the vacuum line off. I ran it for 15+ minutes and watched the nipple ...nothing leaking.
I'm open for other suggestions...
the hard starting is not normal. IMHO.
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Mountain Pass
Joined: Jan 2005
Posts: 116
Likes: 31
From: Langley B.C.
Does the rail lose pressure quickly when the engine is turned off? indicating a leaky injector.
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More Turbo
Joined: Feb 2022
Posts: 656
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From: New Dominion, PE
have not tested that specifically. if there was a leaky injector(s), why would it start right up with the FPR vacuum hose off? it's like the lower pressure when vacuum is being
supplied to it that is the cause. my understanding is that when high vacuum is present (ie: at IDLE), this opens the diaphragm allowing fuel to return to the tank lowering pressure.
A weak spring would let too much fuel out of the rail. No vacuum and the pressure remains at 38 PSI and it starts right up.
supplied to it that is the cause. my understanding is that when high vacuum is present (ie: at IDLE), this opens the diaphragm allowing fuel to return to the tank lowering pressure.
A weak spring would let too much fuel out of the rail. No vacuum and the pressure remains at 38 PSI and it starts right up.
Tuned
Joined: Apr 2023
Posts: 468
Likes: 67
From: Near SLC Utah
I went through several FPRs to get the right pressure at the rail. I just resorted to it being "good enough". It seems like yours is malfunctioning though. I would take a scroll on rockauto and see what they offer. SMP is pretty good along with delphi.
Hotshot
Joined: Jun 2015
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Thread Starter
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More Turbo
Joined: Feb 2022
Posts: 656
Likes: 106
From: New Dominion, PE
I HAD purchased one from rock auto before (walker) and it is now malfunctioning. I had picked one up on ebay. The listing didn't show all 3 mounting holes ...only 2 but the seller indicated it would work on a 5.0L engine. The mounting style was not triangular so it would not work. Finding the exact part # from ford for the model year proved an exercise. But I found it. Looks like they are not easily had. There are others I know (SMP, Delphi, walker, etc.). Just had a bad experience with them.
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