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Effective Tips: How To Get Water Out of Gas Tank

How to Get Water Out of Gas Tank

Water in a gas tank can be a serious issue, leading to various engine problems such as misfiring, stalling, and even permanent damage. It is crucial to address this problem as soon as it is detected. This guide will provide a comprehensive, step-by-step approach to safely and effectively How to Get Water Out of Gas Tank.

Understanding the Problem

Water can enter your gas tank through various means, including condensation, faulty fuel pumps, or contaminated fuel. Once inside, it can mix with gasoline and disrupt the combustion process. Here’s a breakdown of the potential issues water can cause:

  1. Engine Misfire: Water in the fuel can prevent proper combustion, leading to engine misfires.
  2. Stalling: Water can cause the engine to stall or fail to start.
  3. Corrosion: Water can lead to rust and corrosion in the fuel system.
  4. Reduced Efficiency: Water-contaminated fuel can reduce engine performance and fuel efficiency.

Signs of Water in the Gas Tank

Before diving into the removal process, it’s essential to recognize the symptoms of water in your gas tank. These signs include:

  • Rough idling
  • Difficulty starting the engine
  • Poor acceleration
  • Stalling or sputtering
  • Check engine light illumination
  • Decreased fuel efficiency

Tools and Materials Needed

Before starting the process, gather the necessary tools and materials:

  • Fuel siphon pump
  • Gas can or container
  • Rags or paper towels
  • Fuel additive (such as Heet or ISO-HEET)
  • Socket set or wrench
  • Screwdriver
  • Fuel filter replacement (if necessary)
  • Clean cloth
  • Safety gloves
  • Eye protection

Step-by-Step Guide How to Get Water Out of Gas Tank

Step 1: Safety Precautions

Safety should always be your top priority when working with fuel. Follow these precautions:

  • Work in a well-ventilated area to avoid inhaling fumes.
  • Wear safety gloves and eye protection.
  • Keep a fire extinguisher nearby in case of emergencies.
  • Avoid any open flames or sparks in the vicinity.

Step 2: Confirm the Presence of Water

Before proceeding, confirm that water is indeed present in the gas tank. Here’s how:

  1. Visual Inspection: Use a flashlight to look into the gas tank. Water will appear as a separate layer beneath the gasoline.
  2. Fuel Sample: Use a clear container to collect a small sample of the fuel. Let it sit for a few minutes. If water is present, it will separate from the gasoline and form a distinct layer.
Confirm the Presence of Water

Step 3: Siphon Out the Contaminated Fuel

Once you’ve confirmed the presence of water, the next step is to remove the contaminated fuel:

  1. Prepare the Siphon Pump: Insert one end of the siphon pump into the gas tank and the other end into a gas can or container.
  2. Siphon the Fuel: Start the siphon pump to transfer the fuel from the tank to the container. Be sure to remove as much fuel as possible.
  3. Dispose of the Contaminated Fuel: Properly dispose of the contaminated fuel according to local regulations. Do not pour it down the drain or into the environment.

Step 4: Drain the Remaining Fuel

After siphoning out the majority of the fuel, there may still be some residue left in the tank. To ensure all water is removed, you’ll need to drain the remaining fuel:

  1. Locate the Drain Plug: Some vehicles have a drain plug at the bottom of the gas tank. Refer to your vehicle’s manual to locate it.
  2. Remove the Drain Plug: Use a socket set or wrench to carefully remove the drain plug. Allow the remaining fuel and water to drain into a container.
  3. Clean the Drain Plug: Wipe the drain plug and the surrounding area with a clean cloth before reattaching it.

Step 5: Dry the Gas Tank

With the contaminated fuel removed, it’s crucial to dry the inside of the gas tank to ensure no water remains:

  1. Use Rags or Paper Towels: Insert rags or paper towels into the tank to soak up any remaining moisture. Be thorough and ensure the tank is completely dry.
  2. Compressed Air (Optional): If available, use compressed air to blow out any residual moisture from the tank.

Step 6: Add a Fuel Additive

To prevent any remaining traces of water from causing issues, add a fuel additive designed to absorb water:

  1. Choose the Right Additive: Use a fuel additive such as Heet or ISO-HEET, which are specifically formulated to remove water from fuel.
  2. Follow Instructions: Read and follow the instructions on the additive’s packaging for the correct dosage.

Step 7: Refill the Gas Tank

With the tank dry and the additive added, it’s time to refill the gas tank with fresh, clean gasoline:

  1. Use High-Quality Fuel: Ensure the fuel you use is from a reputable source to avoid future contamination.
  2. Fill the Tank: Fill the tank to at least half capacity to help dilute any remaining traces of water.
Refill the Gas Tank

Step 8: Replace the Fuel Filter (If Necessary)

If you suspect the water contamination has affected the fuel filter, it’s a good idea to replace it:

  1. Locate the Fuel Filter: Refer to your vehicle’s manual to locate the fuel filter.
  2. Remove the Old Filter: Use a screwdriver or wrench to remove the old filter. Be prepared for some fuel spillage.
  3. Install the New Filter: Install the new filter and ensure it’s securely fastened.

Step 9: Start the Engine

With the tank refilled and the fuel filter replaced, start the engine to ensure everything is functioning correctly:

  1. Turn the Key: Turn the ignition key to the “on” position and wait a few seconds for the fuel system to pressurize.
  2. Start the Engine: Start the engine and let it run for a few minutes. Listen for any unusual sounds or symptoms.

Step 10: Monitor Performance

After successfully removing the water and starting the engine, monitor your vehicle’s performance over the next few days:

  • Check for Symptoms: Pay attention to any recurring symptoms of water contamination, such as rough idling or stalling.
  • Fuel Efficiency: Keep an eye on your fuel efficiency to ensure it has returned to normal levels.

Preventative Measures

To avoid future issues with water in your gas tank, consider the following preventative measures:

  1. Use Fuel Stabilizers: Regularly use fuel stabilizers to prevent water condensation in the tank.
  2. Buy Quality Fuel: Purchase fuel from reputable gas stations to minimize the risk of contamination.
  3. Keep the Tank Full: Keeping your gas tank full can reduce the chance of condensation forming inside.
  4. Regular Maintenance: Perform regular maintenance on your vehicle, including checking for leaks and replacing old or damaged fuel components.


Water in the gas tank is a serious issue that can lead to various engine problems. By following this step-by-step guide, you can effectively remove water from your gas tank and prevent future contamination. Remember to prioritize safety, use the right tools and materials, and monitor your vehicle’s performance after completing the process. Taking these precautions will help ensure your vehicle runs smoothly and efficiently.

Frequently Asked Questions: how to get water out of gas tank (Quora) Questions And Answers

What is the best fuel additive to remove water from a gas tank?

The best fuel additive to remove water from a gas tank is Heet Gas-Line Antifreeze and Water Remover. It works by absorbing water and allowing it to be safely burned off during the combustion process. Another excellent option is STA-BIL 360 Marine Ethanol Treatment and Stabilizer, which also protects against ethanol-related issues.

How can I separate/drain water from fuel tank of my bike?

To separate and drain water from your bike’s fuel tank, you can use a siphon pump to remove the fuel into a clear container. Allow the container to sit so the water settles at the bottom, then carefully pour off the fuel, leaving the water behind. Alternatively, use the tank’s drain plug if available, or remove the tank to drain and clean it thoroughly.

How do I remove all the fluid out of my motorcycle fuel tank?

To completely remove all fluid from your motorcycle fuel tank:
Turn off the fuel supply valve.
Disconnect the fuel line from the tank.
Use a siphon pump to remove as much fuel as possible.
Unbolt and remove the tank if necessary.
Tilt and drain any residual fuel into a container, and rinse with a small amount of clean fuel if needed.

Can the bike fuel tank get air-locked?

The bike fuel tank can get air locked, which can prevent fuel from flowing to the engine. This typically happens when air is trapped in the fuel lines. Ensuring the fuel cap vent is clear, checking for kinks in the fuel line, and priming the fuel system can help resolve air locks.

How do you remedy water in your gas tank?

To remedy water in your gas tank:

1. Use a fuel additive like Heet to absorb small amounts of water.
2. For larger amounts, drain the tank completely by siphoning out the fuel and water mixture or using the drain plug.
2. Regularly check your tank for moisture and ensure your fuel source is clean.
Consider using a water-separating fuel filter if water contamination is a recurring issue.