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12-11-2009, 09:10 AM #1
- Join Date
- Sep 2005
- Location
- Janesville IA
- Age
- 70
- Posts
- 21
black- 2003 Corvette
fuel pressure drops with key on and motor not run
I have a 95 Z28 that is sometimes slow to start. I checked the fuel pressure with the key on and the motor not running. It runs up to 49 pounds while the pump is running. As soon as the pump stops it drops to about 10 pounds. Is there a check valve or something that keeps the pressure up while the pump is not running? I am using a Haynes maunual that says the pressure should hold steady.
Thanks,
Bruce
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12-11-2009, 02:13 PM #2
- Join Date
- Feb 2006
- Location
- Orange County, NY
- Age
- 48
- Posts
- 2,693
always dirty- 2013 Ram 2014 Caddy ATS
How is the pressure when it is running? Are you checking it with the vacuum line disconnected from the regulator? Sounds like it is leaking down though. Could be an injector or the regulator.
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12-11-2009, 04:44 PM #3
- Join Date
- Sep 2005
- Location
- Janesville IA
- Age
- 70
- Posts
- 21
black- 2003 Corvette
The pressure is 41-43 with the motor running. I did not disconnect the vacumn line from the regulator.
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12-27-2009, 06:09 PM #4
Yes there is a check valve and the pressure should hold for a very long time. It is fairly common for them to go bad and hey can be a pain in the ass to change, i know several people who have just cut a door in the rear deck, because dropping the tank is fairly time consuming. if its dropping really fast, (<10 sec) and has no drivebility problems its most likely the pump.
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12-29-2009, 03:51 AM #5
- Join Date
- Sep 2005
- Location
- Janesville IA
- Age
- 70
- Posts
- 21
black- 2003 Corvette
Thank you, I will get back to working on it in the next few days.
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