View Full Version : Fuel pressure for 1990 chevy c1500 with 5.0 v8
Roggle
Aug 8, 2012, 07:34 PM
How many psi should this pump be putting out?
TxGreaseMonkey
Aug 9, 2012, 05:10 AM
40 to 47 psi.
Roggle
Aug 9, 2012, 06:38 AM
Thanks,monkey. Ive replaced fuel relay,filter and pump. Still no go. So ill hook up fuel pressure gauge and go from there.
TxGreaseMonkey
Aug 9, 2012, 06:49 AM
Is it a crank but won't start situation?
Roggle
Aug 9, 2012, 07:06 AM
Yes. Started as a starter issue. Wouldn't engage every time. Unplugged and replugged starter and that worked. Started truck like 8 times flawlessly to test my work and it stopped firing on the 9th. Changed out the before mentioned parts and no luck. Yet.
TxGreaseMonkey
Aug 9, 2012, 08:06 AM
Greater than 90% of all crank but won't start situations are electrical-related, not fuel. Here are my thoughts:
. Replace the Ignition Control Module (ICM).
. Check/replace the ignition switch for wear, pitting, or melting, if there's any question about the integrity of the switch.
. The fuel pump is likely fine, if you can hear it run when the ignition switch is turned to ON.
Roggle
Aug 9, 2012, 08:29 AM
Ill try those out. Thanks! Let me know if anything else comes to mind.
TxGreaseMonkey
Aug 9, 2012, 08:35 AM
The starter motor cranks every time, right, when the ignition switch is turned to Start?
Roggle
Aug 9, 2012, 11:03 AM
Correct. When I turn the key the starter cranks flawlessly.
TxGreaseMonkey
Aug 9, 2012, 11:32 AM
Good. I think replacing the ICM will solve the problem. Verify, however, that the Check Engine Light comes on and goes off normally, when the ignition switch is turned to ON.
Roggle
Aug 9, 2012, 01:19 PM
I will do that tonight and let you know how it worked tomorrow. Thank you for all your help!
Roggle
Aug 10, 2012, 06:40 AM
You were 100% correct! I changed ICM and she fired up immediately! Thanks again for all your time and assistance!
TxGreaseMonkey
Aug 10, 2012, 06:42 AM
You're welcome. Very good job!