How to Put Alcohol in a Gas Tank


There are a number of reasons why someone might want to add alcohol to a vehicle's gas tank. Alcohol is used in tasks such as cleaning the tank, increasing a vehicle's octane and efficiency and removing water from the car's system. Regardless of the reason for use, there is an easy method for adding alcohol to the engine.

Things You'll Need

  • Measuring cup
  • Gas can
  • Measure the appropriate amount of alcohol for your specific purposes using a measuring cup. For cleaning a gas tank that's been removed from the car, use two to three 16 oz. bottles. Use one 16 oz. bottle in a full tank if you're trying to remove water build-up.

  • Pour the alcohol into a clean, empty gas can.

  • Open the gas tank of your car in the method specific to the make and model.

  • Stick the gas can nozzle into your car's gas tank in the same manner as you fill it with fuel.

  • Tilt the gas can forward and pour the alcohol into the tank until the can is empty.

Tips & Warnings

  • Use a funnel as an alternative method of putting alcohol in a gas tank.
  • Adding too much alcohol to a gas tank can cause serious damage. Thoroughly research the exact amount needed for your intended use before adding it.
  • If adding isopropyl alcohol use only the 99 percent mixture. Lower numbers will add too much water to the tank.


  • Photo Credit gas tank image by Mat Hayward from
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