How to Prevent Rust in Fuel Tanks

Rust most commonly accumulates in a fuel tank, after you have let the tank sit empty or half-full for some time. Many car, motorcycle and lawnmower gas tanks become rusted in the winter months, when they sit idle for weeks or months at a time. As rust in the fuel tank can work its way into the engine and seriously damage your vehicle, it is best to prevent rust before it becomes a problem.

• 1

  Check the tank for holes and leaks. Your first line of defense is a well-sealed fuel tank.

• 2

  Fill your tank to the top, before using the vehicle, especially if you live in cold climates or near a large body of water. High salt concentrations in the air can cause rust if a fuel tank is not full.

• 3

  Add fuel after you have used the vehicle. This will greatly lower your chance of accumulating rust in the fuel tank. Topping off the tank every few days is easier than removing the rust after it has built up in your tank.

• 4

  Fill the tank to prevent moisture buildup along the sides of the tank, if you plan to store your vehicle for more than a few days (see Ref 2, number 1).

• 5

  Place a fuel stabilizer in your tank before filling it, if you plan to store your vehicle for prolonged periods. Whenever you add a fuel stabilizer to a car, you must drive the car for ten or twenty minutes before parking the car.