AFPR and Base Fuel Pressure FP
Thread Starter
Burning Brakes
Joined: May 2001
Posts: 895
Likes: 1
From: Austin TX
AFPR and Base Fuel Pressure FP
I got an Aeromotive AFPR for my LT1. Instructions say that most FP regulators are set at 43. I set mine to 40.
I searched the site, and only thing I could find was what people with 383s are setting their base.
What is base for a stock car?
I searched the site, and only thing I could find was what people with 383s are setting their base.
What is base for a stock car?
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Before installing the AFPR you should have measured the stock fuel pressure setting at idle with the vacuum line disconnected.
Then set the AFPR to that value as the baseline fuel pressure.
If you didn't take that data before installing the AFPR, try 43-44psi; that's the setting on late L98s.
Then set the AFPR to that value as the baseline fuel pressure.
If you didn't take that data before installing the AFPR, try 43-44psi; that's the setting on late L98s.
Thread Starter
Burning Brakes
Joined: May 2001
Posts: 895
Likes: 1
From: Austin TX
Originally Posted by 65Z01
Before installing the AFPR you should have measured the stock fuel pressure setting at idle with the vacuum line disconnected.
Then set the AFPR to that value as the baseline fuel pressure.
If you didn't take that data before installing the AFPR, try 43-44psi; that's the setting on late L98s.
Then set the AFPR to that value as the baseline fuel pressure.
If you didn't take that data before installing the AFPR, try 43-44psi; that's the setting on late L98s.
I had it set at 40 with vacuum disconnected, now have it at 44 with it disconnected.
One thing now, since adding this, I can't start the car right up. Previous, get in the car, turn the key, starts right up. Now, get in, turn the key, here it crank over and over and over, and then it starts. Like the fuel pump can't primer it fast enough. Did this at 40 and 44.
I have been having some bog issues, and thought replacing the fuel filter, AFPR, O2 senor, and plugs would fix it. Looking to be maybe fuel pump or injectors maybe.
What is a tall-tale sign the Fuel Pump is going?
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Put the gauge onto the Schraeder, prime the fuel rail for 2sec with key On and see how long it holds prime.
If the FP won't prime the rail, check the FP fuse and the relay.
Since the AFPR is the latest work area, if it doesn't hold prime, I would check around there for fuel leaks.
When my FP died it was sudden. I pulled out of a parking lot onto the street and the car suddenly sputtered and died, with no fuel pressure at the Schraeder.
If the FP won't prime the rail, check the FP fuse and the relay.
Since the AFPR is the latest work area, if it doesn't hold prime, I would check around there for fuel leaks.
When my FP died it was sudden. I pulled out of a parking lot onto the street and the car suddenly sputtered and died, with no fuel pressure at the Schraeder.
Instructor
Joined: Aug 2004
Posts: 109
Likes: 3
From: Just North of Boston Mass
Telltale dign of bad fuel pump/fuel pressure is a bog.
If you have a fuel press. gage with a long hose, tape it to the OUTSIDE of thr winshield and rdtest with a passenger watching for a pressure drop.
If you have a fuel press. gage with a long hose, tape it to the OUTSIDE of thr winshield and rdtest with a passenger watching for a pressure drop.
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Melting Slicks
Joined: Jan 2000
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From: NW Chicago Suburbs
94-96 Vette's PCM will automaticly compensate for fuel pressure. If you get the pressure in the right range the PCM will make adjustments to set the correct WOT injector pulse width.
Eric
Eric
