Several items on any lawn mower should be checked on a regular basis. They include fuel level, oil level, battery cables and the fuel line. All of these items can be attended to with little or no mechanical knowledge; conversely, if these items are neglected, the mower can be damaged beyond repair. Safety is also a concern: When the fuel line goes bad, leaks, and possibly fire, can result.
Locate the fuel line on the mower. Most fuel lines will exit the bottom of the fuel tank and then travel to the carburetor on the motor.
Remove the fuel line from the carburetor. To do this, squeeze the clamp on the line with the pliers and slide away from the carburetor 6 inches. This will ensure the clamp is off the fuel barb. Then, wiggle the fuel line off the barb.
Place the hose in the bucket and allow the fuel tank to drain completely. To aid the draining process, remove the fuel cap from the mower.
Remove the fuel line from the bottom of the fuel tank after the tank is drained. To do this, squeeze the clamp on the fuel line and slide away from the tank 6 inches. This will ensure the clamp is off the barb. Then wiggle the fuel line off the barb.
Disconnect all the parts to the old fuel line. This will help when cutting the new fuel line to fit. Save the clamps, as they can be reused.
Cut pieces of new fuel line to match each piece of the old fuel line.
Install the first piece of fuel line on the tank barb and clamp in place.
Install the fuel line at the end of the first piece and clamp in place. If the old fuel line did not have a fuel filter, make sure to install one now. Double check the flow arrow on the side of the filter to make sure the filter is properly oriented.
Clamp the next piece of fuel line to the fuel filter.
Install the end of the new fuel line on the carburetor barb and clamp in place. Make sure the fuel line is properly routed.
Pour the fuel in the bucket back into the fuel tank.
Start the mower. The mower may shut off while running because of the large air bubble in the new fuel line. Allow the mower to run constantly for 10 minutes without shutting off.