I have a 2003 Gmc Sonoma, 4.3. The engine will crank over, but will not start. I have poured gas down the throttle body and it starts. So I do have spark. I have connected the the scan tool to the OBC, and there is no code for a problem. I did a fuel pressure test and with the key on it is 60 psi for two seconds until the pump shuts off. Then it drops to 58 psi. Within 5 minutes the pressure drops to 54 psi and holds. I have checked voltage to all the sensors and fuse box. I'm getting correct voltage. I recently remove the Plenum intake cover and performed a visual test for the injectors. All six injectors are working. I'm thinking maybe a fuel pressure regulator? I didn't see any leaks from the regulator. Any Ideas? Thanks!
Thursday, January 3rd, 2013 AT 1:17 AM