How to Change a Propane Tank. Changing a propane tank on a gas grill is easier than it looks. Once you become familiar with the parts of a propane tank and the steps involved, you'll be able to change the tank like a pro.

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Change a Propane Tank

Removing the Tank

Step 1

Turn the gas supply off by turning the valve screw clockwise. The valve screw is located at the top of the tank.

Step 2

Determine what type of connection your propane tank has: internal or external. For internal connections the gas line is connected to the tank on the inside of the gas valve. This connection has a hex nut and requires a wrench for connecting and removing. Go to Step 3. For external connections the gas line is connected to the tank on the outside of the gas valve with a Marshall type acme nut. This nut is a large plastic nut with ridges that can be connected and removed by hand. Go to Step 4.

Step 3

Locate the hex nut that connects the gas line from the grill into the valve opening. Using a wrench, unscrew the hex nut using a clockwise motion.

Step 4

If your gas line is connected externally with a Marshall type acme nut, you can unscrew the valve connection using your hands. Turn the acme nut in a counter-clockwise motion.

Step 5

Lift the tank off of the grill platform.

Step 6

Exchange your old tank for a new tank at a store that provides this service. Most local gas stations and hardware stores offer this exchange. You can refill your old tank at a center that provides propane fuel.

Attaching the New Tank

Step 1

Place the new or refilled tank on the grill platform with the valve opening facing the grill's gas line.

Step 2

Connect the gas line to the valve opening, using a counter-clockwise motion if it attaches to the inside of the valve. Use a clockwise motion if you are using the acme nut or an outside attachment.

Step 3

Test the connection. Apply a professional or homemade (see tip below) soap solution to the valve connection using a small paintbrush. Slowly open the cylinder valve using a half turn. If there are no bubbles, your tank is safely connected.