Bad fuel pressure regulator?
06-01-2003, 10:56 PM
#1
Registered User
Thread Starter
Join Date: Jul 1999
Location: Winnipeg, Manitoba, Canada
Posts: 3,650
Bad fuel pressure regulator?
I just swapped out my stock fuel pump, because it was dying, for a Walbro.
Now when I turn the key to the ON position it goes to 38psi and when I start the car it goes upto 45psi and then throughout the day slowly goes down to 42psi or upto 46psi when I'm travelling at a constant speed at even 1200 rpm.
Doesn't matter how much I turn up the pressure on the Accel adjustable fuel pressure regulator it still goes down to 42psi.
Is it a bad regulator?
Now when I turn the key to the ON position it goes to 38psi and when I start the car it goes upto 45psi and then throughout the day slowly goes down to 42psi or upto 46psi when I'm travelling at a constant speed at even 1200 rpm.
Doesn't matter how much I turn up the pressure on the Accel adjustable fuel pressure regulator it still goes down to 42psi.
Is it a bad regulator?
06-02-2003, 07:28 AM
#2
Registered User
Thread Starter
Join Date: Jul 1999
Location: Winnipeg, Manitoba, Canada
Posts: 3,650
Sometimes initially it will go upto 46psi or so when I turn it up but later it drops to 42psi.
I wouldn't normally care but my O2 sensor voltage at WOT is about 854mV. Normally its around 895mV.
I wouldn't normally care but my O2 sensor voltage at WOT is about 854mV. Normally its around 895mV.
06-02-2003, 10:59 AM
#4
Registered User
Join Date: Jun 2002
Location: sarasota, fl
Posts: 2,456
sorry i dont know the answer.........but i would just try changing out the least expensive part first...........its either gotta be the regulator, or the pump, since that is the part that has been changed.
06-03-2003, 08:00 AM
#6
Registered User
Join Date: Jun 2002
Location: sarasota, fl
Posts: 2,456
Originally posted by Gripenfelter
Well I just swapped out the pump so I guess its the regulator.
Well I just swapped out the pump so I guess its the regulator.
could be..........but its always possible you got a bad pump too............im not sure if that would cause the problem though.
06-03-2003, 08:54 AM
#7
Registered User
Join Date: Oct 2002
Location: Denver
Posts: 856
Is the regulator leaking, pull vac to make sure nothing is coming from there. I assume fuel filter is clean or new! Regulator is only a 5min(4bolts and take fuel rails off) swap and around 50 bucks, make sure to only use DELCO! Aftermarkets regs are worthless and poorly built.
Thread
Thread Starter
Forum
Replies
Last Post
chevroletfreak
LT1 Based Engine Tech
202
07-04-2005 05:00 PM
F(ast)-body
LT1 Based Engine Tech
8
02-26-2003 09:05 AM