How To Remove Old Gas From Car

Old gasoline in your car can cause a variety of problems, ranging from poor engine performance to complete engine failure. If your car has been sitting for an extended period, or if you suspect the fuel in your tank is stale, it's crucial to remove it before attempting to start the engine. This article provides a comprehensive guide on how to safely and effectively remove old gas from your car.

Why Removing Old Gas Matters

Gasoline, unlike wine, does not get better with age. Over time, gasoline degrades and undergoes several chemical changes that render it unsuitable for use in your engine. Understanding these changes helps explain why removing old gas is so important:

• Evaporation of Volatile Compounds: Gasoline contains volatile compounds that evaporate over time. These compounds are essential for the fuel to ignite properly in the engine. As they evaporate, the fuel becomes less flammable and harder to start.
• Oxidation: Gasoline reacts with oxygen in the air, leading to the formation of gum and varnish. These sticky residues can clog fuel lines, fuel filters, and fuel injectors, restricting fuel flow and causing engine misfires or a no-start condition.
• Water Absorption: Gasoline can absorb moisture from the air, especially in humid environments. Water in the fuel tank can lead to corrosion and can also interfere with the combustion process. Furthermore, phase separation can occur in gasoline containing ethanol, where the ethanol separates from the gasoline and settles at the bottom of the tank, creating a corrosive and unburnable layer.
• Reduced Octane Rating: The octane rating of gasoline can decrease over time, especially if the gasoline is exposed to heat or sunlight. Lower octane fuel can cause engine knocking or pinging, which can damage the engine.

Ignoring old gas can lead to significant and costly repairs. Trying to start an engine with degraded fuel can damage fuel system components, necessitate a fuel pump replacement, injector cleaning or even more severe engine damage.

How to Choose the Right Method for Removing Old Gas

Several methods exist for removing old gas from a car, and the best option depends on the quantity of fuel, the tools available, and your comfort level. Here's a breakdown of common methods:

1. Siphoning with a Hand Pump

This is a common and relatively simple method, especially suitable for removing large quantities of fuel. Safety is paramount when working with gasoline. Always work in a well-ventilated area, wear gloves and eye protection, and avoid any sources of ignition.

1. Gather Your Supplies: You will need a siphon hand pump (available at auto parts stores), a suitable container for the old gasoline (approved gasoline container), safety glasses, and gloves. A length of flexible hose that is compatible with gasoline is also essential.
2. Access the Fuel Tank: Locate the fuel tank opening. This is usually under the fuel filler cap.
3. Insert the Siphon Hose: Carefully insert one end of the siphon hose into the fuel tank until it reaches the bottom. Be gentle to avoid damaging the tank or any internal components.
4. Operate the Hand Pump: Follow the instructions provided with your hand pump to start the siphoning action. Typically, this involves repeatedly squeezing a bulb or lever on the pump.
5. Transfer the Fuel: Direct the other end of the siphon hose into your approved gasoline container. Continue pumping until the fuel stops flowing or until you have removed the desired amount of gasoline.
6. Dispose of the Old Fuel Properly: Take the old gasoline to a hazardous waste disposal facility or a recycling center that accepts gasoline. Do not pour it down the drain or into the ground.

2. Using the Fuel Pump Access Panel

Some vehicles have an access panel in the trunk or under the rear seat that allows you to directly access the fuel pump and its associated hoses. This method provides a more direct route for fuel removal.

1. Locate the Access Panel: Consult your car's owner's manual to find the location of the fuel pump access panel.
2. Remove the Access Panel: Carefully remove the panel using the appropriate tools (usually screws or clips).
3. Disconnect the Fuel Line: Identify the fuel line connected to the fuel pump. Disconnect it carefully, ensuring you have a container ready to catch any fuel that spills.
4. Attach a Hose and Pump: Connect a suitable hose to the disconnected fuel line and use a hand pump to siphon the fuel into an approved container.
5. Reassemble: Once the fuel is removed, reattach the fuel line, reinstall the access panel, and dispose of the old fuel properly.

3. Draining the Fuel Tank (Advanced)

This method involves locating the drain plug (if equipped) on the fuel tank or disconnecting the fuel line at the tank and allowing the fuel to drain out. This method requires more mechanical knowledge and caution.

Warning: This method is more complex and can be dangerous if not performed correctly. It's best left to experienced mechanics.

1. Locate the Drain Plug (if applicable): Some fuel tanks have a drain plug at the bottom. If your vehicle has one, locate it.
2. Prepare for Draining: Place a large container under the fuel tank to catch the draining fuel.
3. Open the Drain Plug: Carefully loosen and remove the drain plug, allowing the fuel to drain into the container.
4. Disconnect Fuel Line (if no drain plug): Locate the fuel line connected to the fuel tank. Disconnect it at the tank and allow the fuel to drain into the container.
5. Reinstall/Reconnect: Once the fuel is drained, reinstall the drain plug or reconnect the fuel line securely.
6. Dispose of the Old Fuel Properly: As with the other methods, dispose of the old gasoline responsibly.

Real-World Owner Experiences

Many car owners have encountered the problem of old gasoline. Here are some insights gleaned from online forums and discussions:

• Prevention is Key: Regularly starting and running your car, even if you're not driving it, can help prevent fuel degradation. Adding a fuel stabilizer to the tank before storing the car can also help.
• Professional Help: If you're unsure about any of these methods or if you're dealing with a large quantity of old fuel, it's best to consult a professional mechanic. They have the experience and equipment to safely and efficiently remove the fuel.
• Fuel Stabilizers: Owners have reported success using fuel stabilizers like STA-BIL to extend the life of gasoline. These additives help prevent oxidation and gum formation.
• Ethanol Concerns: Vehicles that sit for extended periods with ethanol-blended gasoline are more prone to problems due to water absorption and phase separation. Consider using ethanol-free gasoline if you plan to store your car for a long time.
• Smell Test: A simple way to check if your gasoline is old is to smell it. Fresh gasoline has a distinct odor, while old gasoline often smells stale or sour.

Frequently Asked Questions (FAQs)

Q: How long does gasoline last in a car?

A: Generally, gasoline can last for 3-6 months in a car's fuel tank. However, this can vary depending on factors like temperature, humidity, and the presence of ethanol.

Q: Can I just add fresh gasoline to old gasoline?

A: While adding a small amount of fresh gasoline to a nearly full tank of old gasoline might be okay in some cases, it's generally not recommended, especially if the fuel has been sitting for a long time. The old fuel can still cause performance problems. It's always best to remove the old fuel and start fresh.

Q: What happens if I try to start my car with old gasoline?

A: Starting your car with old gasoline can lead to a variety of problems, including difficulty starting, rough idling, engine misfires, reduced power, and potential damage to fuel system components.

Q: Where can I dispose of old gasoline?

A: You can dispose of old gasoline at hazardous waste disposal facilities, recycling centers that accept gasoline, or some auto parts stores. Never pour it down the drain or onto the ground.

Q: Are there any additives I can use to prevent gasoline from going bad?

A: Yes, fuel stabilizers like STA-BIL can help prevent gasoline from degrading. These additives help prevent oxidation, gum formation, and water absorption.

Q: How often should I start my car if I'm not driving it regularly?

A: Ideally, you should start your car and let it run for 15-20 minutes every couple of weeks to keep the engine lubricated and prevent fuel degradation.

Q: What if I accidentally spill gasoline?

A: If you spill gasoline, immediately wipe it up with absorbent materials like rags or paper towels. Dispose of the contaminated materials properly. Ensure the area is well-ventilated to allow any remaining fumes to dissipate.

Removing old gas from your car is a crucial step in maintaining its performance and preventing costly repairs. By following the methods outlined in this article and prioritizing safety, you can ensure that your car runs smoothly and reliably for years to come.