I'll start the ball rolling---- manual or solenoid fuel shut off ??, if manual, make sure the shutoff is going the full travel to the run position, if solenoid, check operation, get another to switch key to on while you listen for the solenoid to click in, also listen that the solenoid will hold in the run position, also check if wiring connector is firm on the solenoid, also check if continuous voltage is at the solenoid terminal when in run mode.
Fuel filters are up to date, if old could be clogged, there could be air in the system, have you tried bleeding the system ??.
that's the basics for starters, pun not intended !!.
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