How to Clean a Gummed Up Gas Tank on a Motorcycle


If gas has been sitting in a gas tank for awhile it has a tendency to eat away at the interior of the gas tank and gum up with age, so the gas will not be as potent as normal gas and your motorcycle won't run correctly. Cleaning out the gummed up gas tank will be required before you add more gas. Having a clean gas tank is crucial for your motorcycle to run optimally. Cleaning out a gummed up gas tank on a motorcycle is a fairly straightforward process and a great skill to know for other gas tank cleaning you may want to do.

Things You'll Need

  • Carb cleaner
  • Pliers
  • Toilet brush
  • Gas
  • Goggles
  • Empty can
  • Masking tape
  • Remove the clamp from the hose attached to the bottom of the gas tank with a pliers. Place the empty can under the hole to capture the gummy gas.

  • Tape over the gas tank base hole with masking tape. Take the cap off the top of the tank. Pour 2 cups of gas into the tank. Insert the toilet brush scrubber, dip it in the gas and then scrub the interior of the tank. Remove the brush once complete.

  • Remove the tape on the base nozzle hole under the tank and capture the dirty gas in the can.

  • Replace the hose to the base of the gas tank and clamp it back on.

  • Fill the gas tank 3/4 full of gas. Add an 8 ounce bottle of carb cleaner to the gas tank.

Tips & Warnings

  • If you know your motorcycle is going to be sitting for an extended period of time, you should drain the gas out of the tank by disconnecting the hose under the tank and draining all the gas into a can, then reattaching the hose to the tank. Start the motorcycle and let it run until it dies; this way you burn all the gas out and prevent any gumming up.
  • Wear safety goggles.

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