Will not start, turns over but fails to start, seems as if it is not getting gas. Perhaps the fuel pump or sending unit is bad. gas guage does work now either.

No issues with the fuel guage that I know of , but you can follow the basic troubleshooting guidelines. Starting with the wiring disconnect at the fuel tank for a bad connector or bad connection. Only other connection would be up to the instrument cluster in the vehicle. Only replaceable items would be the guage or the sending unit in the fuel tank. You can disconnect the return line circuit or connector at the at the gas tank and jump a wire to the ground the that feeds the gauge and see if the guage moves, but don't and i repeat don't hold to long because the guage will go over hard over and could damage the guage. If the guage moved and I would suspect a bad float on the sending unit or a bad sending unit, either case the fuel pump assy would have to come out for repairs.

Most likely the sending unit is bad in the fuel tank. The easiest way to get to it is to remove the bed. Taking the tank off is quite a chore. You can unplug the tail light harness and the license plate lights& take the 6 bolts out of the bed and 2 good men can lift the bed off. The fuel tank will be in full view. Take the sending unit out of the tank by unhooking the fuel lines, wiring plug and turn the lock ring counter clockwise and lift the fuel pump and sending unit out of the tank and replace it. Reinstall it and check to see if it is working before you put the bed back on. I hope this is helpful.

Perhaps you did not get the wires plugged back together properly. Or, perhaps you damaged the sending unit in the tank when you had it apart.

Or, perhaps you accidentally blew the fuse for it when you were changing the pump, or you have pinched some wires when you put it back together, causing a short, and the guage not to work.

You will have to find out if it is plugged in properly, with no pinched/cut wires, and check to see that there is power going to the gauge.

If there is power going to the guage, and it still doesn't work, then you will have to repair the sending unit in the tank.

could be the float in the tank might have a hole in it and is stuck

The gas guage does not have its own fuse but instead gets its power from the "integrated power module" that handles power delivery to the entire instrament cluster and beyond. If the guage is in-op,[doesnt work] then you will need to have a few "hands-on tests run to verify if the sending unit in the tank[fuel pump module] is functional or if this problem lyes else-where, wiring problem, bad ground,ect,ect.. One hint would be if the low fuel level l;ight still functions without the fuel guage working,then your problem is NOT in the tank and very likely is in your dash-electrical or faulty guage.
8w-40-2
8w-40-2

SOUND LIKE FUEL GAUGE IS FAULTY.IF YOU REPLACED FUEL PUMP ASSEMBLY WITH NEW FUEL LEVEL SENDING UNIT.PROBLEM IS IN THE GAUGES.

you may have a bad fuel pump or a bad injection pump,here are picture of the two, as far as the gauge you may have a bad fuel sending unit, this is in the tank and work like a toilet float and sends a signal to the gauge, the injection pump and fuel pump are located on top of motor you would need to have the preasure checked on both before just replace them hope this is helpful.

THESE PROBLEMS ARE FROM THE FUEL PUMP AND THE SENDER, IT COMES AS A MODULE ASSEMBLY, IT IS INSIDE THE FUEL TANK

If there is gas in the tank and it is not registering correctly, then the sending unit or power to sending unit is bad.