Hard to start '03 Silverado

[davebb]

My '03 Silverardo 5.3 is no longer a turn key start. It doesn't matter if it's hot or cold. I turn the key off and turn the key again and the truck starts instantly every time. Truck runs perfectly other than that. Has 345,000 kms and everything is original.

[txab]

Fuel filter

fuel pressure regulator

Fuel pump

 

Remove the vacuum line at the FPR. If fuel is present, replace the FPR

 

Take a pressure reading. Key on, engine off. Record pressure. Should be 55-62 psi. When pump stops operating, pressure should stabilize, then remain constant. If it drops more than about 5 psi in about a minute, you've got a bad check valve at the pump. Requires pump replacement.

[waumo1]

^^^ What he says.

[8.1HD/ALLISON]

+1