Running Out of Gas vs. Filling Up Frequently: What’s Better for Your Car?

When it comes to maintaining your car, fuel management is one of the critical aspects. Whether you prefer running your car completely out of gas or filling up the tank every time it's half empty, both methods have their pros and cons. Let’s break down the potential impacts of each approach based on expert advice and automotive knowledge.

Running Out of Gas: The Risks and Dangers

Running your car out of gas is a common practice for many drivers. However, this habit can be risky and detrimental to your car's health. The primary concern is the potential damage to the fuel pump. Here’s why this can be problematic:

Fuel Pump Damage: When the fuel pump draws in air instead of gasoline, it can cause several issues. The fuel pump is designed to operate with a specific lubrication and cooling effect provided by fuel. Without this, the pump can overheat and possibly seize or grind, leading to premature failure. Particle Build-Up: When your car runs out of gas, particles and sludge that have settled at the bottom of the tank get sucked into the fuel lines. The fuel pump then grinds these particles, which can lead to clogging of the fuel filter. This clogging can further deteriorate performance and fuel efficiency. Engine Stalling: Running out of gas can cause the fuel to slosh around in the tank, which can lead to engine stalling when making turns or sharp maneuvers.

These problems highlight why running your car out of gas is generally not recommended and can lead to costly repairs and maintenance.

Filling Up Frequently: The Benefits and Trade-offs

Filling up your gas tank frequently, especially when the reservoir is only around a quarter empty, can have its own set of advantages and potential downsides:

Reduced Wear on Fuel Pump: When your tank is frequently full, the fuel pump gets more consistent usage, which can help maintain its lubrication and cooling. This can extend the life of the fuel pump and reduce the likelihood of overheating or grinding. Moisture Control: When the fuel tank is full, there is less air space, and thus less moisture intrusion. In humid climates, this can help prevent water accumulation inside the tank, which can lead to rust and corrosion. Avoiding Rude Mechanisms: Filling up the tank regularly can prevent the wear on the mechanism that keeps the gas cap in place. Frequent operation of this mechanism can lead to wear and potential failure over time.

However, it’s important to note that while these benefits are present, they don't outweigh the risks associated with running your car out of gas.

What’s the Best Practice?

According to automotive experts like Tom and Ray Magliozzi, also known as the "Click and Clack Twin Plumber," you should never run your gas tank completely empty. They advise maintaining a level of fuel that keeps the tank about a quarter full at all times. This ensures that the fuel pump can function correctly and that you avoid the issues associated with running out of gas.

Conclusion

Maintaining proper fuel levels is crucial for the longevity and reliability of your car. While there are both advantages and disadvantages to filling up your tank regularly or allowing it to run low, the best practice leans towards maintaining a fuel level that keeps the tank about a quarter full. This approach helps protect your fuel pump, reduces the potential for moisture and rust, and extends the life of your vehicle.