You should never have air in the lines, even when fuel sender quits pressurizing no air will enter.
You will slowly leak off pressure but youll never gain air.
Quick way to check fuel pressure is to cycle the key to the "on" position but do not start the truck up. pop the hood, and on the fuel rail there will be a small valve, like a common bike valve except slightly smaller. unscrew the cap off and press the center pin with a point object. be very careful, wear glasses because fuel will spray very quickly.
This is all in assuming fuel pressure is the key here.
Clean IACsensor, TB, MAFsensor. I know these have nothing to do with cut off for fuel. Never hurts
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