fuel pressure ?
Thread Starter
Burning Brakes
Joined: Jun 2003
Posts: 949
Likes: 0
From: smithtown ny
fuel pressure ?
i have been having trouble with fuel pressure bleeding down on my 91. fuel pump, fuel reg, and injecters from 5-o-motorsports all are a yr old. 40psi to 15psi in 7mins. now i noticed my idle goes up and down almost stalls. i did pinch off the supply from the tank but made no diffrence. fuel reg is fine also. can i pull plugs and see if any are wet????????????
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
With an idle problem, I would expect it to be an IAC valve failure.
As for the pressure loss, the check valve in the pump might have failed. Buty that drop isn't really bad. How long does it take to go from 15psi to 0?
As for the pressure loss, the check valve in the pump might have failed. Buty that drop isn't really bad. How long does it take to go from 15psi to 0?
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by bogus
As for the pressure loss, the check valve in the pump might have failed.
Originally Posted by 6spd
i did pinch off the supply from the tank but made no diffrence.
RACE ON!!!
Racer
Joined: Dec 2004
Posts: 427
Likes: 0
From: Albuquerque New Mexico
Is there gas coming from the vacum line off of the fpr? For me I had a problem with the fuel pressure dropping out. Changed the filter, problem solved. My car has FI, but I did have issues with my fuel pump as well. Is your fuel pump operating correctly? (I.E. getting 13.5 volts?) If it has a short or is just crapping out it won't be able to keep up with the demand of the fuel injectors.
-Dave
-Dave
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by drochau
My car has FI, but I did have issues with my fuel pump as well. Is your fuel pump operating correctly? (I.E. getting 13.5 volts?) If it has a short or is just crapping out it won't be able to keep up with the demand of the fuel injectors.
-Dave
-Dave
Originally Posted by 6spd
i have been having trouble with fuel pressure bleeding down on my 91
Originally Posted by 6spd
when i shut it down pressure held longer.
RACE ON!!!
Racer
Joined: Dec 2004
Posts: 427
Likes: 0
From: Albuquerque New Mexico
Originally Posted by CFI-EFI
All C4's are "FI"The fuel pump has nothing to do with it. There is no complaint of inadequate fuel pressure, running. Just that the fuel pressure bleeds down after the engine (and the fuel pump) is shutoff.
RACE ON!!!
RACE ON!!!
. BTW, thanks a million for helping me with tracking down my problem, she's running excellent now! 
-Dave
Le Mans Master
Joined: Feb 2002
Posts: 7,858
Likes: 2
Originally Posted by 6spd
well i took the car for a ride and when i shut it down pressure held longer. it did not drop as fast????????????????????????
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