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Hard to start '03 Silverado

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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.

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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.

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