High Fuel Pressure?
Thread Starter
Melting Slicks
Joined: Jun 2007
Posts: 3,011
Likes: 2
From: Greenville SC
St. Jude Donor '10
High Fuel Pressure?
I just installed a fuel pressure gauge on my '00 and it's readings have me confused. When I turn on the ignition the gauge goes right to 58lbs but when I start the engine it jumps to about 68lbs. I'm using an auto meter sending unit fed off the fuel rail with a 3' 4an line as the gauge instructions recommended not mounting the gauge directly to the fuel rail because of possible vibration issues.
I thought maybe the sending unit was bad but like I said it reads 58lbs when the ignition is turned on so I don't know what is going on.
Any thoughts?
I thought maybe the sending unit was bad but like I said it reads 58lbs when the ignition is turned on so I don't know what is going on.
Any thoughts?
Melting Slicks
Joined: Sep 2008
Posts: 3,138
Likes: 802
From: Espanola New Mexico
High Fuel Pressure
The increase in fuel pressure when the car is running could be due to the fact that you have higher voltage, when the ignition is on the pump is just running on battery voltage, or the gauge is sensitive to the voltage change.
Thread Starter
Melting Slicks
Joined: Jun 2007
Posts: 3,011
Likes: 2
From: Greenville SC
St. Jude Donor '10
Nope
Nope, stays at 68 even after driving the car for a while.
Maybe it is a voltage issue, I used the A&A write up to do the install and got my power from the yellow wire under the steering column.
Nope, stays at 68 even after driving the car for a while.
Maybe it is a voltage issue, I used the A&A write up to do the install and got my power from the yellow wire under the steering column.
Safety Car
Joined: Apr 2000
Posts: 4,326
Likes: 140
From: Weatherford, TX
Safety Car
Joined: Jan 2008
Posts: 4,797
Likes: 52
From: Boise
Sorry to bump an old thread, but I am having the same issue, and I'm wondering if OP ever found a solution.
I see 58 psi key on engine off, but as soon as I fire it up it goes to 64 psi.
Could it be that the extra voltage from the racetronix harness is upping the fuel pressure? Even if that was the case what's the point of an adjustable regulator if it can't regulate a couple extra volts at the pump?
I see 58 psi key on engine off, but as soon as I fire it up it goes to 64 psi.
Could it be that the extra voltage from the racetronix harness is upping the fuel pressure? Even if that was the case what's the point of an adjustable regulator if it can't regulate a couple extra volts at the pump?
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Pro
Joined: Aug 2006
Posts: 565
Likes: 2
From: Chattanooga TN
Sorry to bump an old thread, but I am having the same issue, and I'm wondering if OP ever found a solution.
I see 58 psi key on engine off, but as soon as I fire it up it goes to 64 psi.
Could it be that the extra voltage from the racetronix harness is upping the fuel pressure? Even if that was the case what's the point of an adjustable regulator if it can't regulate a couple extra volts at the pump?
I see 58 psi key on engine off, but as soon as I fire it up it goes to 64 psi.
Could it be that the extra voltage from the racetronix harness is upping the fuel pressure? Even if that was the case what's the point of an adjustable regulator if it can't regulate a couple extra volts at the pump?
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
If it is steady I'd just leave it as is.
Thanks,Matt
Melting Slicks
Joined: Jun 2007
Posts: 2,704
Likes: 4
From: Lone Star State
For reference, my car, boost referenced, is at 58 psi at startup. When at WOT I hit 68 psi.
Put a mechanical guage at the FPR to get a more accurate reading. My guage reads a little higher in car for whatever reason.
I am running an a and a fuel system, hence the FPR. If you don't have one, put guage coming off the fuel rail.
GL
