First, make sure you either drain the tank or run it down as far as possible. If your truck has a carb engine, the first thing you will need to do is to disconnect the fuel lines from the sending unit in the tank. If your truck has fuel injection, you will need to relieve the pressure in the fuel system before removing the lines. If you should happen to forget to do this, don't panic. You will just have some spray when you disconnect the lines.
Once you have removed the lines from the sending unit, next remove any wiring for the sending unit. You may find it easier to remove the wires, and the fuel lines for that matter, if you lower the tank a little.
If your tank has a rubber hose type filler neck, make sure to remove it from the tank.
You can lower the tank slightly be loosening the gas tank straps that hold the tank in the truck. When you are sure that you have disconnected everything, you can remove the straps from one side at a time. You may need an extra pair of hands, too! Slowly lower the tank down and out. Installation is just the reverse.
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