Fuel pressure regulator question
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
Only way to tell anything is test fuel pressure with a gage on the test port.
Engine at idle 30 to 45 psi.
Remove the vacuum hose, read 40 to 50 psi.
Engine shut down after test should hold pressure for 5 min at 30 to 40 psi.
.
Issues caused by too high or too low pressure are many and varied from rich running to lean fuel starvation.
These conditions set a number of codes depending on what and when the systerm detected an issue via the OX sensors.
A low pressure can be a faulty fuel pump or a plugged filter.
Long crank times could be the fuel pump.
I can't answer only to you general question so what problem are you having?
Good luck.
Engine at idle 30 to 45 psi.
Remove the vacuum hose, read 40 to 50 psi.
Engine shut down after test should hold pressure for 5 min at 30 to 40 psi.
.
Issues caused by too high or too low pressure are many and varied from rich running to lean fuel starvation.
These conditions set a number of codes depending on what and when the systerm detected an issue via the OX sensors.
A low pressure can be a faulty fuel pump or a plugged filter.
Long crank times could be the fuel pump.
I can't answer only to you general question so what problem are you having?
Good luck.
Thread Starter
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New User
Joined: May 2012
Posts: 11
Likes: 0
No codes Bluegrass. Every once in a while it lacks power and will shutter or have a slight miss on take off. Idles rough at times. No vac leaks. Throttle body is clean as a whistle and new IAC valve. New plugs and wires were installed just about an hour ago. I haven't test drove it yet but it seems to idle better. I thought maybe a plug or wire was breaking down under a load. I also changed the coil pack.
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
If the regulator fails, gas leaks back to the tank and you have starting problems / lag. THe pressure should be maintained on the fuel rail for several hours. Put a gauge on the schrader valve, or just push the center pin after a few hours and see if pressure is good.
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Keith Wells
1987 - 1996 F150 & Larger F-Series Trucks
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Oct 5, 2020 03:21 PM
