We’ve all taken that risk—watching the fuel gauge dip below empty and hoping there’s just enough gas to make it to the next station. While it might seem like a harmless gamble, running low on fuel or completely out can do more than leave you stranded. It can strain your fuel pump, clog your fuel system with debris, and even cause long-term engine damage. Is saving a few extra miles worth the potential repair costs?
What Happens When You Run Out of Fuel
When your fuel tank runs dry, your car’s engine and fuel system stop receiving the fuel they need to operate. This causes your engine to stall, leaving you stranded. But the effects of running out of gas go beyond just an inconvenience—they can lead to mechanical and system damage that could be expensive to repair.
Potential Damage Caused by Running Out of Fuel
Fuel Pump Wear and Failure
One of the most critical components affected by running out of fuel is the fuel pump. The fuel pump is designed to stay submerged in fuel to keep it cool and properly lubricated. When you run your car on low fuel levels frequently, or worse, run out of gas completely, the pump overheats and wears out faster.
A failing fuel pump can lead to hard starting, poor acceleration, or a complete breakdown, requiring replacement—which can be an expensive repair.
Clogged Fuel Injectors and Filters
Your fuel tank contains small amounts of dirt, rust, and sediment that settle at the bottom over time. When fuel levels are low, these contaminants get pulled into the fuel lines and injectors, leading to blockages.
Clogged fuel injectors can cause poor engine performance, misfires, and rough idling, while a blocked fuel filter restricts fuel flow, making it difficult for your car to start or accelerate smoothly.
Air in the Fuel System
When your car runs out of fuel, air can enter the fuel lines and injectors, creating an airlock that prevents proper fuel flow. Some vehicles, particularly those with diesel engines, require special procedures to remove trapped air before the engine will restart properly.
Air pockets can cause stalling, hesitation, and erratic engine performance even after refueling, requiring additional time and effort to purge the system.
Engine Damage and Misfires
Modern engines rely on precise fuel delivery for smooth operation. When fuel levels drop too low or run out entirely, the engine may misfire or run lean, which increases heat and friction inside the cylinders.
Over time, this can cause premature wear on engine components, including the pistons, valves, and spark plugs. Repeated misfires or fuel starvation can also trigger the check engine light, leading to further diagnostic and repair costs.
Avoid Running Out of Fuel
Keeping your fuel levels above a quarter tank is the best way to protect your engine and fuel system. Regular refueling helps prevent fuel pump overheating, injector clogs, and other avoidable issues.
If you find yourself running low on fuel often, consider these tips:
- Plan ahead – Keep an eye on your fuel gauge and refuel before reaching critical levels.
- Know your range – Understand how far you can travel on a near-empty tank, but don’t push it.
- Use navigation apps – Apps like Google Maps or Waze can help locate the nearest gas stations.
- Monitor fuel efficiency – If you notice a sudden drop in MPG, your fuel system may already need maintenance.
Four Car Garage
Running out of fuel isn’t just an inconvenience—it can cause long-term damage to your car’s fuel system and engine components. If you’ve recently run out of gas or notice poor performance, difficulty starting, or unusual engine behavior, our professionals at Four Car Garage in San Mateo, CA, can inspect your vehicle and ensure everything is running properly. Call us today to schedule an inspection!
