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How Do You Flush Gas?

Published in Fuel System Maintenance 3 mins read

The process of "flushing gas" typically refers to removing old or contaminated gasoline from a fuel system. Here's a step-by-step guide based on the provided information:

Steps to Flush Gas from a Fuel System

It's important to remember that working with fuel systems can be dangerous due to the highly combustible nature of gasoline. Always prioritize safety.


Here's how to safely and effectively remove old or contaminated fuel:

  1. Drain the Tank: Begin by draining the fuel tank. This can be done by using a siphon, a hand pump, or by removing the drain plug, if available.
  2. Remove the Tank: Once the tank is drained, carefully remove it from the vehicle. This allows for a more thorough cleaning.
  3. Wash the Tank: Thoroughly wash the inside of the fuel tank using a suitable cleaning solution designed for fuel tanks. You might use a solvent or dedicated fuel system cleaner.
  4. Clean the Fuel System: In addition to the tank, the rest of the fuel system, including fuel lines and fuel rails should be cleaned. Again use a specialized fuel system cleaner.
  5. Replace the Fuel Filter: After cleaning, replace the fuel filter with a new one to prevent any remaining contaminants from re-entering the system.
  6. Put It Back: Reassemble the fuel system, including the cleaned fuel tank and new filter.

Example scenario: Flushing a Motorcycle Fuel System

  • Let's say your motorcycle has been stored for a long time, and you suspect the gas is old.
  • First you'll drain the old fuel using a siphon.
  • Then carefully detach the fuel tank from the motorcycle, taking note of how all the tubes are connected.
  • You'll use a fuel tank cleaner to wash the inside of the fuel tank.
  • Next you'll clean the fuel lines and carburetor (or fuel injector system) with a fuel system cleaner.
  • After that, a new fuel filter should be installed to ensure no contaminants enter the engine.
  • Finally, you'll reattach the fuel tank and fill it with fresh fuel.

Safety First

  • Always work in a well-ventilated area.
  • Avoid open flames or sparks.
  • Wear protective gear like gloves and eye protection.

By following these steps, you can effectively and safely flush the gas from your vehicle's fuel system.

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