Fuel and water don’t mix, so it’s always unfortunate when water is found in a driver’s gas tank. When this liquid somehow finds its way inside a vehicle’s gas tank, it can cause some serious performance issues. So how does it get there to begin with?
Water can infiltrate a vehicle’s gas tank if a driver refuels at a gas station that has (illegally) watered down its fuel to make a profit. In some cases, the gas station’s supplier might be selling them contaminated gas unintentionally.
Condensation is another common cause, especially in colder climates where moisture builds up inside the fuel tank. Whatever the case, water should be removed from a vehicle’s gas tank as soon as it’s been detected.
If you’re considering a career as an auto mechanic, here are some common signs that water has made its way into the gas tank, as well as some tips for removing it.
Auto Mechanic School Students Should Watch for These Signs of Water in a Fuel Tank
When water gets into a vehicle’s gas tank, it can cause some unfortunate performance issues, especially when accelerating. Water can enter a vehicle’s combustion chamber when a driver puts their foot on the gas pedal, causing the engine to misfire and making the car’s acceleration choppy or hesitant.
The driver may also have difficulties starting the engine, as water can inhibit the spark plug’s ability to ignite and deliver power to the engine. The vehicle’s exhaust system may also be affected by the presence of water, creating white exhaust smoke as it evaporates and turns to steam upon exiting the tailpipe.
What is the best way to remove water from a gas tank? The most effective way to remove water from a fuel tank is by draining the tank completely, replacing the fuel filter, flushing the fuel lines, and refilling with fresh fuel. Professionals with car mechanics training can help drivers to remove water from their tank safely by following the steps below.
Step One: When Removing Water from a Gas Tank, Empty the Tank First
The first step to removing water from a gas tank is to empty the tank. What is the best way to separate water from a gas tank? Using a fuel siphon pump or vacuum pump is the most effective method to remove water from the gas tank. Some mechanics may also let the fuel settle and extract water from the bottom.
It’s important to let the tank drain completely before moving on to the next step, as any traces of water could affect a vehicle’s performance.
Step Two: Replace a Vehicle’s Fuel Filter and Flush Its Fuel Lines
After the tank has been drained, auto mechanic school graduates can replace a vehicle’s fuel filter. The presence of water in the gas tank can damage the fuel filter by weakening it.
When a fuel filter isn’t functioning properly, it can let other contaminants into the fuel supply, potentially harming the engine. Next, it’s important to flush a vehicle’s fuel lines. Exposure to water in fuel tanks can cause corrosion, increasing the chances of a dangerous leak.
What gas treatment removes water from a gas tank? Fuel additives like HEET, ISO-HEET, or Sta-Bil are specially designed to absorb water from a gas tank and help remove it through the fuel system. These treatments are effective for small amounts of water contamination.
Step Three: Fill Up the Gas Tank and Take Steps to Avoid a Repeat of the Problem
When the fuel lines have been flushed and the filter has been replaced, a vehicle’s gas tank can be filled up once again. If a driver wants to avoid getting water in their fuel supply in the future, it’s important that they:
- Use good-quality fuel from reputable gas stations
- Choose ethanol-free fuel, as it won’t absorb water
- Ensure the gas cap is tightly sealed to prevent moisture entry
- Regularly check for condensation buildup, especially in colder months
While water in a fuel tank can be inconvenient, it’s typically a simple problem for an automotive professional to fix. As a mechanic, make sure your clients recognize the symptoms of water in the gas tank to ensure no lasting damage is caused.
Did You Know? For minor cases of water in a gas tank, using a fuel additive like HEET can help absorb and remove small amounts of moisture safely.
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Frequently Asked Questions
What is the best way to remove water from a gas tank?
The most effective way to remove water from a fuel tank is by draining the tank completely, replacing the fuel filter, flushing the fuel lines, and refilling with fresh fuel.
What is the best way to separate water from a gas tank?
Using a fuel siphon pump or vacuum pump is the most effective method to remove water from the gas tank. Some mechanics may also let the fuel settle and extract water from the bottom.
What gas treatment removes water from a gas tank?
Fuel additives like HEET, ISO-HEET, or Sta-Bil are specially designed to absorb water from a gas tank and help remove it through the fuel system. These treatments are effective for small amounts of water contamination.
