If your riding lawn mower has been sitting in the shed all winter long, you might find that there is old gas in the lawn mower that will need to be removed. A riding lawn mower with bad gas will not run smoothly as it can build up deposits in the engine and hinder combustion. Before you begin removing the old gasoline in the lawn mower, you will need to gather a few supplies to complete the task. You will need an oil siphon pump to assist in the removal as well as a proper container in which to drain the unwanted gas.
Step 1: Before removing old gas from the lawn mower, place it on a flat level surface.
Step 2: Take care to turn the mower off and make sure the engine is cool. Then remove the ignition key and disconnect the spark plug wire to prevent accidental ignition.
Step 3: Unscrew the gas cap on the top of the riding lawn mower.
Step 4: Take the oil siphon pump and place the orange tube into the gas tank on the engine and the black tube into a container designed for the collection and disposal of gasoline.
Step 5: With the tubes in the correct place, pump the handle three or four times to prime it. Once the liquid begins to flow, it will continue flowing without further pumping.
Step 6: When the bad gas in the lawn mower has been drained, you can remove the oil siphon pump and set aside the old gas for disposal.
Step 7: Add new gas to your riding lawn mower. Make sure when you change your lawn mower's bad gas that the new gas has a fuel stabilizer mixed in to help it last longer. This is especially important when you're doing end-of-season maintenance.
Step 8: Replace the gas cap and reconnect the spark plug ignition wire.
Step 9: Dispose of your lawn mower's bad gas properly by taking it to a local waste disposal facility.
After you've changed the gas in your riding lawn mower, start the engine and let the new gas cycle through for a few minutes in a well-ventilated area before returning to mow the lawn. Make sure you check the gasoline at least once a season. If it contains debris or your engine is not running smoothly, it's probably time to replace the old gasoline in your lawn mower. For more tips on riding lawn mower maintenance from Cub Cadet. Check out our article repository.