- Aug 8, 2012
- 79
2001 Chevy Tahoe, 5.3L, Auto, 4x4, 155K, I’ve owned her since 135K
She has been slow to start. She cranks just fine but takes awhile to start and then stumbles a little and then runs fine. Once she does start then you can shut her down and restart her at will. I changed the plugs and wires (ACs) and put on a new fuel filter no change. It must be fuel now but is it the pump or the fuel pressure regulator?
Fuel pressure:
After sitting all night put the gauge on and no gas came out of the connector 0psi.
At key on the pressure goes to 32 psi. Key on again pressure goes to 35 psi. Key on again pressure goes to 37 psi.
Start the truck the gage goes all over 25-50 once running she settles out at 50 psi. Pull the vacuum line off the fuel pressure regulator and the pressure goes up to 56 then back down to 50 psi after it is replaced. No fuel in the fuel pressure regulator vacuum line.
I shut her down and fuel pressure was at 50 psi. After 30 minutes still 50 psi. After 1 hour 49 psi. After 5 hours 45 psi.
Fuel pump or the fuel pressure regulator?
Thanks,
Walt
She has been slow to start. She cranks just fine but takes awhile to start and then stumbles a little and then runs fine. Once she does start then you can shut her down and restart her at will. I changed the plugs and wires (ACs) and put on a new fuel filter no change. It must be fuel now but is it the pump or the fuel pressure regulator?
Fuel pressure:
After sitting all night put the gauge on and no gas came out of the connector 0psi.
At key on the pressure goes to 32 psi. Key on again pressure goes to 35 psi. Key on again pressure goes to 37 psi.
Start the truck the gage goes all over 25-50 once running she settles out at 50 psi. Pull the vacuum line off the fuel pressure regulator and the pressure goes up to 56 then back down to 50 psi after it is replaced. No fuel in the fuel pressure regulator vacuum line.
I shut her down and fuel pressure was at 50 psi. After 30 minutes still 50 psi. After 1 hour 49 psi. After 5 hours 45 psi.
Fuel pump or the fuel pressure regulator?
Thanks,
Walt