Fuel Pressure inquiry
Thread Starter
Melting Slicks
Joined: Jan 2007
Posts: 3,021
Likes: 133
From: Conejo Valley CA
Fuel Pressure inquiry
Fellow Supercharger enthusiasts,
I have an '02 Z06 with a P1SC Procharger. I have had the car a year and I have noticed that the Fuel Pressure Pillar meter has typically read between 57 PSI and 62 PSI. However, very recently, I noticed that the fuel pressure is reading 52, 53 PSI. I don't know if this has anything to do with the outside temperatures. Southern California this week is in a heat wave and it has been in the low 100's this week.
I have a Lingenfelter fuel pump which from what I understand is a respectable fuel pump and it was installed with the supercharger in 2004.
I have not noticed anything different in the car's behavior (e.g. no pinging). Are these PSI levels anything I need to be concerned about? If these PSI values are fine, out of curiosity, what PSI levels does one have to be concerned about.
Thanks,
Matt
I have an '02 Z06 with a P1SC Procharger. I have had the car a year and I have noticed that the Fuel Pressure Pillar meter has typically read between 57 PSI and 62 PSI. However, very recently, I noticed that the fuel pressure is reading 52, 53 PSI. I don't know if this has anything to do with the outside temperatures. Southern California this week is in a heat wave and it has been in the low 100's this week.
I have a Lingenfelter fuel pump which from what I understand is a respectable fuel pump and it was installed with the supercharger in 2004.
I have not noticed anything different in the car's behavior (e.g. no pinging). Are these PSI levels anything I need to be concerned about? If these PSI values are fine, out of curiosity, what PSI levels does one have to be concerned about.
Thanks,
Matt
Melting Slicks
Joined: Jan 2006
Posts: 2,648
Likes: 0
From: St.Petersburg FL
St. Jude Donor '09-'10
Fellow Supercharger enthusiasts,
I have an '02 Z06 with a P1SC Procharger. I have had the car a year and I have noticed that the Fuel Pressure Pillar meter has typically read between 57 PSI and 62 PSI. However, very recently, I noticed that the fuel pressure is reading 52, 53 PSI. I don't know if this has anything to do with the outside temperatures. Southern California this week is in a heat wave and it has been in the low 100's this week.
I have a Lingenfelter fuel pump which from what I understand is a respectable fuel pump and it was installed with the supercharger in 2004.
I have not noticed anything different in the car's behavior (e.g. no pinging). Are these PSI levels anything I need to be concerned about? If these PSI values are fine, out of curiosity, what PSI levels does one have to be concerned about.
Thanks,
Matt
I have an '02 Z06 with a P1SC Procharger. I have had the car a year and I have noticed that the Fuel Pressure Pillar meter has typically read between 57 PSI and 62 PSI. However, very recently, I noticed that the fuel pressure is reading 52, 53 PSI. I don't know if this has anything to do with the outside temperatures. Southern California this week is in a heat wave and it has been in the low 100's this week.
I have a Lingenfelter fuel pump which from what I understand is a respectable fuel pump and it was installed with the supercharger in 2004.
I have not noticed anything different in the car's behavior (e.g. no pinging). Are these PSI levels anything I need to be concerned about? If these PSI values are fine, out of curiosity, what PSI levels does one have to be concerned about.
Thanks,
Matt
I would check your fuel filter and replace it if need be. Its fairly easy to get to even if you dont have an access to a lift. The lines are all quick connect. Hope this helps in comparision.
Joe
Last edited by Z06_Joe; Sep 2, 2007 at 10:41 PM.
Instructor
Joined: Feb 2005
Posts: 228
Likes: 2
From: Phoenix AZ
St. Jude Donor '08
My autometer electric fuel pressure bought on eBay used is always at 52 and has never matched the dyno fuel pressures on two occasions which run around 60. I have a Walbro 255, K-B BAP and Racetronix wiring harness. I've got to think a bad guage or sensor, or how I have it wired must make it read low. I've posted this before with no suggestions. But maybe someone knows what is going on.
Supporting Vendor
Joined: Dec 2001
Posts: 1,573
Likes: 31
From: A dealer near you.
My autometer electric fuel pressure bought on eBay used is always at 52 and has never matched the dyno fuel pressures on two occasions which run around 60. I have a Walbro 255, K-B BAP and Racetronix wiring harness. I've got to think a bad guage or sensor, or how I have it wired must make it read low. I've posted this before with no suggestions. But maybe someone knows what is going on.
Burning Brakes
Joined: Jan 2006
Posts: 1,170
Likes: 27
From: Magnolia Greens NC
Ahhhh, the answer!
My Autometer is reading the same way now with these 95 degree days (55psi down to 52psi @ WOT)....and YES, the sending unit is mounted on the end of the fuel rail! In 60 dgree weather it reads 57psi...so, now I have the reason...THANKS, Racetronix!!.....uhhh, exactly where should the sensor be mounted to avoid heat?
Drifting
Joined: May 2004
Posts: 1,904
Likes: 2
From: London(UK)/Troyes(France)
My Autometer is reading the same way now with these 95 degree days (55psi down to 52psi @ WOT)....and YES, the sending unit is mounted on the end of the fuel rail! In 60 dgree weather it reads 57psi...so, now I have the reason...THANKS, Racetronix!!.....uhhh, exactly where should the sensor be mounted to avoid heat?
I would like to know where to mount it as well.
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Probably the reason why i have had to replace one already.
Burning Brakes
Joined: Nov 2005
Posts: 815
Likes: 1
From: Georgetown TX
I used a braided line that already had a pre-fabbed fitting. It was a little long but I had it on the shelf already. I needed some brass adapters (also used what was on hand) to connect it to the sender, which is now ziptied next to the brake booster along the firewall. I'll put up a pic shortly...
Many say that the vibration from being mounted directly to the fuel rail will result in a shortened life for the sender.
In response to the original question, even with my sender located near the firewall, my pressure on a 90F+ day in traffic had my gauge going down to 52psi vs the 59-60 it normally reads, so I don't think the location under the hood makes much difference in that regard.
Many say that the vibration from being mounted directly to the fuel rail will result in a shortened life for the sender.
In response to the original question, even with my sender located near the firewall, my pressure on a 90F+ day in traffic had my gauge going down to 52psi vs the 59-60 it normally reads, so I don't think the location under the hood makes much difference in that regard.
Instructor
Joined: Feb 2005
Posts: 228
Likes: 2
From: Phoenix AZ
St. Jude Donor '08
Mine also is mounted at the end of the fuel rail. In Phoenix it is always hot enough to make it run lower if sensitive to heat. Where would be a better place to mount the sensor?
Instructor
Joined: Feb 2005
Posts: 228
Likes: 2
From: Phoenix AZ
St. Jude Donor '08
I'm looking into an Autometer braided stainless steel extension which would remove the sensor to a remote location but still connected to the fuel rail fitting. They offer in 3, 4, or 6 ft lengths.
Burning Brakes
Joined: Nov 2005
Posts: 815
Likes: 1
From: Georgetown TX
Here are the pics of my sensor mounting I mentioned a few posts prior.
You can't see the line from the fuel rail but there are no adapters used, just removal of the schrader valve and the -4 female end screws over it.
You can't see the line from the fuel rail but there are no adapters used, just removal of the schrader valve and the -4 female end screws over it.