96 fuel pressure test results
Thread Starter
Safety Car
Joined: Mar 2017
Posts: 4,208
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From: LeClaire Iowa
96 fuel pressure test results SUCESS!!!
My 96 base has run great for the last three years. The last three times I have started it there was much more cranking than usual and ran rough for maybe 4 seconds. I did a search and read every post on checking fuel pressure and did not see anything like my results talked about. With key on I only get 26 pounds (should be 45). I tried pulling out the key and turning to on many times but it just stays at 26. When started it jumps up to 38 (should be 40 but close). With the regulator unplugged it jumps to 44 (should be 45 but almost fine). What does the 26 with the key on tell you experts? Fuel pump has never been changed. Also, after turning off it does not leak down very fast at all. Thanks very much!!! Dan
Last edited by Whaleman; Jul 9, 2020 at 02:25 PM.
Team Owner
Joined: Jul 2004
Posts: 28,495
Likes: 3,298
From: Hartford WI
I believe that the first time in a long time that you turn the key on, it will prime. In your case, it doesn't get past 26. The 2nd time and 3rd, etc time, it probably won't prime. Have you tried crimping off the return line and turn the key on for the first time in a while and see if the pressure works up to what it should be?
Thread Starter
Safety Car
Joined: Mar 2017
Posts: 4,208
Likes: 1,328
From: LeClaire Iowa
I believe that the first time in a long time that you turn the key on, it will prime. In your case, it doesn't get past 26. The 2nd time and 3rd, etc time, it probably won't prime. Have you tried crimping off the return line and turn the key on for the first time in a while and see if the pressure works up to what it should be?
Thread Starter
Safety Car
Joined: Mar 2017
Posts: 4,208
Likes: 1,328
From: LeClaire Iowa
Thanks for your response. I bought the car 3 years ago with 27,000 miles. I changed the fuel filter and have put 10k miles on it. I will change it again if I change the pump. I will check the voltage. I assume I pull the electrical connector and have my wife turn the key on while I have a multi meter hooked up. Dan
Team Owner
Joined: Jul 1999
Posts: 65,492
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From: Orange Park Florida
Thanks for your response. I bought the car 3 years ago with 27,000 miles. I changed the fuel filter and have put 10k miles on it. I will change it again if I change the pump. I will check the voltage. I assume I pull the electrical connector and have my wife turn the key on while I have a multi meter hooked up. Dan
Drifting
Joined: Jun 2018
Posts: 1,678
Likes: 229
From: Michigan
Not running you should see close to battery voltage 12.2-12.6 range. Running you should see 13-13.5V. Either way is a valid test.
Your fuel filter is probably not the issue give its age, but they are cheap. I like the idea of replacing it with a new pump. I would give it a go before replacing the pump because it may fix it, it is cheap, and you are going to do it anyway.
Crimping the return line, while not explained above, basically isolates your Fuel Pressure Regulator being the issue because it regulates what is allowed to return to tank. By crimping this off and seeing the same result, your root cause is not the FPR.
How about leak down. With the line crimped, primed, and then how long does the system hold pressure? You may have a bad pulsator, check valve, or leaking injector. Before buying a pump, I would dig just a bit deeper.
Last edited by KyleF; Jun 29, 2020 at 05:02 PM.
Team Owner
Joined: Jul 2004
Posts: 28,495
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From: Hartford WI
Thank you for taking the time to reply Aklim. I went out today and clamped the return line. I then turned the key on and it went to 24 pounds. I then unclamped the return line and bled the pressure and turned the key on again and got the exact same 24 pounds. What does this tell you sir? Thanks, Dan
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Thread Starter
Safety Car
Joined: Mar 2017
Posts: 4,208
Likes: 1,328
From: LeClaire Iowa
I want to thank everyone who responded and helped. I am going to change out the pump and filter. It means a lot to me that people will take the time to answer my questions. Dan
Thread Starter
Safety Car
Joined: Mar 2017
Posts: 4,208
Likes: 1,328
From: LeClaire Iowa