A fuel pressure gauge can be bought from any autoparts store for around $20 or less, just screws on to the fuel rail, makes easy to check pressure, just when you take it off make sure it seals back up, and check a couple times after.

It is never a good idea to run low on gas.
When the pump starts sucking air, it greatly reduces the life of the pump.
Even if there is gas in the tank and running fine, when cornering, the gas will slosh to the side and could leave the pickup barely sucking, so it is getting gas and also some air, but might not be enough to relize it is sucking a small amounts of air.

Does anyone know if crossfire will give a code with low fuel pressure?

Do you use premium gas only??? 92+ octane?

When it does start, does it fire right up as it should, or does it have to crank a couple xtra rotations ?

Another thing I carry around with me is a mechanics stethoscope, cheap at any autoparts store also.

Example if someone was turning car over you can listen to each injector to hear if they are opening and closing.

1st I would try.
Disconnect battery for 15 minutes then rehooked battery and try and start your car.