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I have found that the easiest way is to remove the bed. Take the three nuts out that hold the flange inside of the fuel filler door. Remove the 8 bolts that hold the bed on from underneath. Unplug the tail light wires. One person on each side at the wheel well, lift it and slide it off, either completely, or half way (the second way helps to have two milk crates placed behind the vehicle). Remove the fuel lines and unplug the sending unit at the top of the tank. Unscrew the outer ring and remove the sending unit. Either that, or drop the tank which can damage the lines, etc.. then reconnect and lift the tank back into place. Removing the bed is usually the easiest route and the biggest time saver.
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The fuel pump is in the gas tank, the best way to do this is to get some friends and remove the bed from the frame. There is i believe 8 bolts that hold the bed to the frame, and don't forget to remove the hardware to the gas tank filler neck. Once the bed is off the frame, you can get to the fuel tank. Disconnect the wire harness and might as well replace the harness since there only $12.00 last i looked, disconnect the fuel line and return line. Remove the fuel pump retainer ring and lift up on the fuel pump sending unit. To install replace the rubber O ring and oil it before installing the new fuel pump sending unit. Install the fuel sending unit retaining ring, gas lines, new wire harness, and filler tube. Good lime also to check the hose to the EVAP since you can inspect them, look for any dry rot to the vacuum lines and replace if needed. Reinstall the bed and use lock tight to the bed bolts or replace them with stainless bolts. Good luck and hope this helps, oh and you might as well change the fuel filter while your have the bed off. The other way is to drop the gas tank which means draining the tank and raising the truck.
A few things could end with these results. A faulty Fuel Sending unit, an issue with the gauge directly or a poor connection at the sending unit its self. I would start with the wiring and go from there. Check at the fuel tank where the wiring connects for the fuel pump and sending unit for corrison, a good cleaning and some ***-electric grease will do wonders.
Can't say for sure since you did not include year of your car but more than likely it's the fuel sending unit that requires replacement. Some years you can replace just the level sensor on the fuel sending unit but both repairs involve dropping the gas tank and opening to remove the fuel sending unit.
No power to the fuel pump is a common issue with Toyota Trucks. More than likely, the power wire at the top of the fuel tank sending unit is rusted off. If this is the case, you either need to drop the tank, or remove the bed to replace the sending unit assembly. I have done it both ways, but have found that removing the bed is easier than dropping the tank.