How To Get Water Out Gas Tank

Water in your gas tank is a serious problem that can lead to a range of performance issues and even significant engine damage. The good news is that it's often treatable, and understanding the symptoms, causes, and solutions can help you get your vehicle back on the road quickly. Addressing this issue promptly is crucial for maintaining the longevity and reliability of your car's engine.

Recognizing the Symptoms of Water in Your Gas Tank

Identifying the signs of water contamination early can save you from costly repairs down the line. Be alert for these common symptoms:

• Rough Idling: Your engine may struggle to maintain a consistent idle speed, fluctuating erratically or even stalling. This is often one of the first and most noticeable symptoms.
• Difficulty Starting: You might experience prolonged cranking or repeated attempts to start the engine, especially in cold weather. The water interferes with the combustion process.
• Engine Misfires: The engine may feel like it's "skipping" or running unevenly. You might notice a jerking or sputtering sensation, particularly during acceleration.
• Reduced Fuel Efficiency: Water displaces gasoline, reducing the amount of fuel available for combustion. This leads to a noticeable decrease in your miles per gallon (MPG).
• Stalling: The engine may suddenly stall, especially when accelerating or under load. This can be dangerous, particularly in traffic.
• Check Engine Light: The "check engine" light may illuminate, accompanied by diagnostic trouble codes (DTCs) related to misfires, lean fuel mixtures, or fuel system malfunctions. A scan tool is needed to retrieve these codes.
• Hesitation During Acceleration: When you press the accelerator, the engine may hesitate or feel sluggish before responding. This is caused by the inconsistent fuel delivery due to the presence of water.
• Unusual Engine Noises: You might hear popping or sputtering sounds from the exhaust, indicating incomplete or irregular combustion.

Understanding the Root Cause: How Water Gets In

Several factors can contribute to water accumulating in your gas tank:

• Condensation: Temperature fluctuations can cause condensation to form inside the gas tank, especially when the tank is not full. Over time, this condensation accumulates and separates into water.
• Contaminated Fuel: Water can enter the fuel supply chain at various points, from storage tanks at gas stations to tanker trucks during transportation. This is less common but still a possibility.
• Loose or Damaged Fuel Cap: A damaged or improperly sealed fuel cap allows moisture to enter the tank, especially during rain or car washes. This is a very common culprit.
• Faulty Fuel Tank Vent System: The fuel tank vent system is designed to allow air into the tank as fuel is used, preventing a vacuum. If this system malfunctions, it can draw in moisture.
• Flooding Events: If your vehicle has been submerged in water, even partially, it's highly likely that water has entered the fuel tank.

Because water is denser than gasoline, it settles to the bottom of the tank. The fuel pump, which draws fuel from the bottom of the tank, will then pick up this water and send it through the fuel lines and into the engine. This is why the symptoms are often most pronounced during acceleration or when the fuel level is low.

The Consequences of Ignoring Water in Your Gas Tank

Ignoring the presence of water in your gas tank can have serious consequences for your vehicle's engine and fuel system:

• Corrosion: Water can corrode metal components within the fuel system, including the fuel tank, fuel lines, fuel pump, and fuel injectors. This corrosion can lead to leaks and component failure.
• Fuel Injector Damage: Water can clog or damage fuel injectors, leading to poor fuel atomization and reduced engine performance. Replacing fuel injectors can be expensive.
• Fuel Pump Failure: The fuel pump relies on gasoline for lubrication. Water can cause the pump to overheat and fail prematurely.
• Engine Damage: In severe cases, water can enter the engine cylinders and cause damage to pistons, connecting rods, and cylinder walls. This can result in a costly engine rebuild or replacement.
• Catalytic Converter Damage: Misfires caused by water contamination can lead to excessive unburned fuel entering the catalytic converter, potentially causing it to overheat and fail. Catalytic converter replacement is often a significant expense.

Recommended Fixes for Removing Water from Your Gas Tank

There are several approaches to removing water from your gas tank, ranging from simple DIY solutions to more involved professional services:

1. Fuel Additives (Fuel System Water Remover)

For minor water contamination, a fuel additive specifically designed to remove water may be effective. These additives typically contain alcohols that bind with the water, allowing it to be safely burned along with the gasoline. Follow the manufacturer's instructions carefully. Be sure to choose an additive that is compatible with your vehicle's fuel system, especially if it's a modern vehicle with sensitive sensors and components.

Important: Fuel additives are best suited for small amounts of water. If you suspect significant contamination, more aggressive measures are needed.

2. Siphoning or Pumping Out the Fuel Tank

This involves using a siphon or pump to remove the contaminated fuel from the tank. This is a more effective method than fuel additives, especially if you suspect a large amount of water. Be extremely careful when handling gasoline, as it is highly flammable. Work in a well-ventilated area and avoid any sources of ignition.

Procedure:

1. Locate the fuel tank drain plug (if your vehicle has one).
2. If there is no drain plug, use a siphon or pump to extract the fuel through the fuel filler neck. A long, flexible hose will be necessary.
3. Collect the fuel in approved containers.
4. Dispose of the contaminated fuel properly at a hazardous waste disposal facility. Do not pour it down the drain or onto the ground.

3. Draining and Cleaning the Fuel Tank (Professional Service)

For significant water contamination or if you suspect sediment and debris have also entered the tank, a professional fuel tank cleaning is recommended. This involves completely removing the fuel tank from the vehicle, draining it, and cleaning it thoroughly. A mechanic will also inspect the tank for corrosion or damage.

Benefits:

• Complete removal of water and contaminants.
• Inspection of the fuel tank for damage.
• Professional cleaning and treatment of the tank.

4. Replacing the Fuel Filter

After removing the water from the fuel tank, it's essential to replace the fuel filter. The fuel filter traps contaminants and debris that may have been stirred up during the process. A clogged fuel filter can restrict fuel flow and cause performance problems.

Recommendation: Replace the fuel filter every 30,000 miles as part of routine maintenance.

5. Professional Fuel System Flush

A professional fuel system flush involves using specialized equipment to clean the entire fuel system, including the fuel lines, fuel rail, and fuel injectors. This service can remove any remaining water and contaminants, ensuring optimal fuel delivery and engine performance.

Cost Estimates and Shop Advice

The cost of removing water from your gas tank can vary depending on the severity of the contamination and the chosen method:

• Fuel Additives: $10 - $30
• Fuel Filter Replacement: $50 - $150 (parts and labor)
• Siphoning/Pumping Out Fuel: $0 - $50 (depending on equipment needed) - DIY
• Fuel Tank Draining and Cleaning (Professional): $200 - $500 (depending on the vehicle and shop rates)
• Fuel System Flush (Professional): $150 - $350
• Fuel Pump Replacement: $300-$1000+ (parts and labor) - if the pump was damaged by water
• Fuel Injector Replacement: $200-$1200+ (parts and labor) - if the injectors were damaged by water

Shop Advice:

• Get a Diagnosis: Before authorizing any repairs, ask the mechanic to perform a thorough diagnosis to confirm the presence of water in the fuel tank and identify any other related issues.
• Ask for a Quote: Obtain a written estimate that includes a breakdown of all costs, including parts, labor, and any applicable taxes.
• Check for Warranty Coverage: If your vehicle is still under warranty, check to see if the fuel system is covered.
• Choose a Reputable Shop: Select a qualified and experienced mechanic to perform the repairs. Look for shops with ASE (Automotive Service Excellence) certification.

Credibility and Technical Information

While there isn't a single specific TSB (Technical Service Bulletin) addressing "water in the gas tank" across all manufacturers, manufacturers often release TSBs related to fuel system contamination, misfires, and related issues that can be indirectly caused by water in the fuel. These TSBs often provide diagnostic and repair procedures for technicians.

For example, if a vehicle is experiencing misfires, a technician would check for common causes, including fuel contamination. The specific TSB will depend on the make, model, and year of the vehicle. You can search for TSBs related to fuel system issues on websites like NHTSA (National Highway Traffic Safety Administration) or Alldata.

Community data and online forums dedicated to specific vehicle makes and models often contain threads and discussions about experiences with water in the gas tank. These discussions can provide valuable insights into common causes, symptoms, and recommended solutions for specific vehicles. Many owners report encountering water in the gas tank after periods of heavy rain or flooding, or after purchasing fuel from stations with questionable storage practices.

Fuel pump failures, which can be exacerbated by water contamination, often occur around 80,000 to 150,000 miles, depending on the vehicle and driving conditions. Fuel injector problems can arise sooner, particularly if the vehicle is frequently exposed to contaminated fuel.

By understanding the symptoms, causes, and solutions, you can take proactive steps to protect your vehicle from the damaging effects of water in your gas tank. Early detection and prompt action can save you from costly repairs and ensure the continued reliability of your engine.