Go to NAPA and buy WIX fuel filter. 33737
Fuel Pressure Question
Thread Starter
Melting Slicks
Joined: Jul 2010
Posts: 3,479
Likes: 92
From: Between Tally and Gatorville ,Florida
Fuel Pressure Question
I have been having issues with my engine running rich after warm up and throwing code p0102. ( Have a separate thread for the run rich issue) While trouble shooting it I installed a fuel pressure gauge at the fuel rail and noticed the pressure at 72 lbs in Idle. What's up with that? is that normal and would cause it to run rich? it has stock injectors.
Last edited by Dale002; Aug 11, 2015 at 07:43 PM.
Le Mans Master
Joined: Aug 2005
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From: CA.
St. Jude Donor '13-'14-'15
P0102 is a MAF code--- normally caused by an over oiled cold air intake that fouls the MAF sensor or simply a dirty MAF-- I would pull the sensor out --clean it with brakeclean and re-install
Normally a high fuel pressure issue will trigger a "rich code" and not a MAF code
72 PSI does sound high but I wouldn't put all that much faith in that reading
Normally a high fuel pressure issue will trigger a "rich code" and not a MAF code
72 PSI does sound high but I wouldn't put all that much faith in that reading
Le Mans Master
Joined: Apr 2001
Posts: 5,941
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From: Was New Orleans but swam to Baton Rouge LA
Cruise-In IX Veteran
Definitely look at the maf to fix the code you see. As mentioned above the fuel filter is the pressure regulator so you may want to swap that. Also buy a quality filter. I had one filter I installed regulate at 62 psi. I swapped on another and it is at a solid 58 psi.
Last edited by Sigforty; Aug 11, 2015 at 04:51 PM.
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St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Thread Starter
Melting Slicks
Joined: Jul 2010
Posts: 3,479
Likes: 92
From: Between Tally and Gatorville ,Florida
At this time It have a new oem filter/regulator installed. It would have to be the regulator part of the filter. I tried using a different gauge and the pressure dropped two pound. so, I don't think it's a faulty pressure gauge but, I'm going to try with a different one tomorrow. Then I guess if it's still high I will replace the filter/regulator or at least put the old one back on and see what that one reads.
Thread Starter
Melting Slicks
Joined: Jul 2010
Posts: 3,479
Likes: 92
From: Between Tally and Gatorville ,Florida
P0102 is a MAF code--- normally caused by an over oiled cold air intake that fouls the MAF sensor or simply a dirty MAF-- I would pull the sensor out --clean it with brakeclean and re-install
Normally a high fuel pressure issue will trigger a "rich code" and not a MAF code
72 PSI does sound high but I wouldn't put all that much faith in that reading
Normally a high fuel pressure issue will trigger a "rich code" and not a MAF code
72 PSI does sound high but I wouldn't put all that much faith in that reading
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
Depending on the scanner brand you are using or if you are using HP or EFILIVE the fuel pressure readings are never quite accurate--If you have attached a fuel pressure gauge to the port o the fuel rail then you may get a more accurate reading---But even then when you rev up the RPM's while the car is in P/N the reading still may not be accurate as there is NO engine load--To really get a 100% accurate fuel PSI you need to attach a fuel pressure gauge and temporarily tape it to the windshield and read the PSI while driving under various amounts of load
Thread Starter
Melting Slicks
Joined: Jul 2010
Posts: 3,479
Likes: 92
From: Between Tally and Gatorville ,Florida
Depending on the scanner brand you are using or if you are using HP or EFILIVE the fuel pressure readings are never quite accurate--If you have attached a fuel pressure gauge to the port o the fuel rail then you may get a more accurate reading---But even then when you rev up the RPM's while the car is in P/N the reading still may not be accurate as there is NO engine load--To really get a 100% accurate fuel PSI you need to attach a fuel pressure gauge and temporarily tape it to the windshield and read the PSI while driving under various amounts of load
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Thread Starter
Melting Slicks
Joined: Jul 2010
Posts: 3,479
Likes: 92
From: Between Tally and Gatorville ,Florida
Ok, Wanted to let everyone know the outcome of this problem. I hate when op leave there issues open. I decided to replace the test gauge first, that brought down the pressure to 63 psi, I also replaced the fuel filter/regulator and the pressure is now a steady 58 psi at idler and 56 to 60 through driving range. As always, Thanks for the help.