I'm happy I added one on the rails even more now.
the OP doesn't. Sorry for the thread jack.
fuel pressure problem?
Thread Starter
Instructor
Joined: Feb 2005
Posts: 118
Likes: 0
fuel pressure problem?
I have a supercharged car with a boost a pump set-up
the pod gauge in my car always has read 60 to 61 lbs fuel pressure which I was told by the GM service guy is the correct factory pressure without the BAP increase - now it is only reads about 40 lbs -
so my question is whether it is likely the guuge is bad since the car probably wouldn't run and start normally if there is only really 40 lb fuel pressure?
I have not wanted to get on the car hard to see what happens in case there is really fuel pressure that low either due the BAP failure or possibly even the start of failure to the stock fuel pump - I assume the car would run lean in that cause and maybe do some real damage?
Any thoughts would be appreciated
Thanks
the pod gauge in my car always has read 60 to 61 lbs fuel pressure which I was told by the GM service guy is the correct factory pressure without the BAP increase - now it is only reads about 40 lbs -
so my question is whether it is likely the guuge is bad since the car probably wouldn't run and start normally if there is only really 40 lb fuel pressure?
I have not wanted to get on the car hard to see what happens in case there is really fuel pressure that low either due the BAP failure or possibly even the start of failure to the stock fuel pump - I assume the car would run lean in that cause and maybe do some real damage?
Any thoughts would be appreciated
Thanks
Le Mans Master
Joined: Aug 2002
Posts: 8,472
Likes: 38
From: Houston TX
St. Jude Donor '11
Normal is ~60#. I've seen mechanical fuel pressure gauges go bad and read low and I've seen EFPG's go bad too. I think before you do anything drastic it's worth verifying the pressure with a mechanical gauge on the rail.
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Safety Car
Joined: Sep 2007
Posts: 3,502
Likes: 82
At idle you should have 55-60psi. Put a mechanical fuel pressure gauge on the schrader valve on the front of the driver's side fuel rail and see what you have. Anything less than 55psi and you need to start looking for where the problem is. 40psi is not enough.
Thread Starter
Instructor
Joined: Feb 2005
Posts: 118
Likes: 0
Now the pod gauge reads 0 so obviously either the gauge itself is bad or the wiring to it since the car is running fine
I guess my next step will be to determine what the problem is with that but in the meantime at least the car runs and I have learned a little bit about stock fuel pressure and how the boost a pump works
anybody out there have any deals on cobalt gauges - my air fuel one doesn't work either so I am down to just the s/c boost guage
I guess my next step will be to determine what the problem is with that but in the meantime at least the car runs and I have learned a little bit about stock fuel pressure and how the boost a pump works
anybody out there have any deals on cobalt gauges - my air fuel one doesn't work either so I am down to just the s/c boost guage