Hi,
The PCM provides a ground path to complete the primary side of the pump relay. So, I have to ask if the fuel pump relay and the main relay have been checked? Not the fuses for them but in this case the relay itself. If not, switch them with a different relay having the same part number and see if that makes a difference.
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
Next, when the vehicle does start, do you ever notice any strong exhaust odors or dark smoke from the exhaust? Is the check engine light staying on after the engine is running? If so, have you scanned the computer for codes?
Let me know.
Joe
See pic below. Note: I highlighted the green wire with a black tracer. That is what runs to the PCM to provide a ground to the primary side of the relay.
Image (Click to make bigger)
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Sunday, September 29th, 2024 AT 7:59 PM