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Pressure in fuel rail after engine shutoff..

Barnes

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Joined
Feb 9, 2003
Messages
6,249
Location
Richland, WA
How long should there be fuel pressure in the rail after you turn the car off?

I was working on my car last night, and noticed that after about 2hrs the pressure was down to 0psi. I don't think that's normal.
 

SleepinGVR4

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Feb 12, 2003
Messages
2,483
Location
Danville, Pennsylvania
I believe its different for every type of fuel pressure regulator. Some bleed off fast and some hold pressure for a while. What FPR do you have?

Someone correct me if i'm wrong.
 

strokin4dr

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Joined
Aug 30, 2005
Messages
2,770
Location
Savannah, GA
I have an aeromotive fpr and mine does the same thing. Others have had this happen with aftermarket fpr too. It takes a couple of seconds for the car to crank in the morning, but other than that I have no issue with it.
 

Barnes

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Feb 9, 2003
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6,249
Location
Richland, WA
K. I can't believe I forget the name. The one that bolts straight to the rail. They only did a limited run.

Anyways, I guess that still leaves me pondering.

I'm still convinced I've got a bad injector. I guess I'll find out soon enough when I get my Keydiver ECU and I can put my 660's in.
 

icurunnin

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Joined
Nov 20, 2006
Messages
1,668
Location
Fort Worth Tx
another reason could be the fuel pump bleeding down. had that happen on 501 and had to tighten the clamp on my pump.
 

GVR4_1057

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Joined
Sep 3, 2008
Messages
676
Location
Brucetown VA
It is pretty normal for the AFPRs to bleed off pressure right away. It used to bother me then I realized that there may be an advantage that it gets another couple engine rotations in to get the oil pressure higher before it fires. Maybe it doesn't matter that much /ubbthreads/images/graemlins/dunno.gif
 

Rausch

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Joined
Dec 21, 2004
Messages
12,049
Location
Cleveland, OH
My Aeromotive held for like a week, and after that woudl bleed down in a matter of minutes. FWIW. Other than the mentioned extra cranks, no harm, no foul.
 

Barnes

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Joined
Feb 9, 2003
Messages
6,249
Location
Richland, WA
Well. I was just curious mostly because I'm trying to diagnose my injectors. I think one leaks. Weird idle issues, and the occasional backfire make me suspicious.
 

Jon,remind me when I do your chip and I'll add some extra code that runs the fuelpump for the first 5 seconds when you turn the key on. That primes the pump and lines for you, so starting will be easier.
As far as the injectors, if you suspect a leaky injector I would send all 4 of them to Rich at CruzinPerformance and have them cleaned.
 

Barnes

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Joined
Feb 9, 2003
Messages
6,249
Location
Richland, WA
Thanks Jeff. Although it seems to start fine for me. So maybe I don't need it. :shrugh:

The injectors I have now are bone stock. I think when I put the black car down for maintainence I'm going to send off all 8 450cc injectors and get back on nice clean set. /ubbthreads/images/graemlins/smile.gif
 
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