What are the hazards of refueling when the fuel tank is almost empty?
2 Answers
The hazards of refueling only when the fuel tank is almost empty include air intake throughout the fuel line up to the engine, which can complicate exhaust processes. For gasoline engines, the fuel pump is usually located inside the tank and relies on fuel for cooling. Running out of fuel can easily lead to pump burnout. Precautions for car refueling are as follows: 1. Refuel in the morning or evening: Gasoline is charged by volume rather than weight and is subject to thermal expansion and contraction. Refueling during cooler morning or evening temperatures allows for more mass per volume of gasoline, resulting in savings. A temperature difference of 15 degrees between morning and evening can amount to a difference of 0.62L. Even if the savings are minimal, the risk of hazards is lower at cooler temperatures. 2. Avoid filling the tank completely: There's no need to fill the tank completely for city driving, as frequent stops and starts increase engine load. It's best not to exceed two-thirds full. Overfilling can cause gasoline to overflow, potentially entering the intake manifold through the pipes and "drowning" the spark plugs, leading to engine stalling after refueling. In severe cases, this can prevent normal engine start-up or even cause gasoline to leak from the carbon canister, posing a significant fire hazard if exposed to open flames. 3. Don't wait until the tank is empty: The fuel pump relies on gasoline for cooling. If the fuel level is too low to cover the pump, prolonged use can reduce the pump's lifespan. While this is less of an issue in winter, the risk is higher in the hotter summer months. Additionally, if the fuel level is too low, the pump may draw in sediment from the bottom of the tank, potentially clogging the pump or blocking the fuel line. 4. Avoid refueling during thunderstorms: It's advisable not to refuel during thunderstorms as the fuel nozzle may introduce stray currents into the fuel tank, increasing the movement of unstable gasoline molecules and raising the risk of fire or explosion hazards.
Running your fuel tank dry can cause serious harm, and I'll explain why based on my driving experience. When you drive until empty, the fuel pump overheats because it relies on gasoline for cooling and lubrication. Running it dry is like burning out an electric motor, and repairs can be outrageously expensive, often costing hundreds or even thousands. Sediments at the bottom of the tank can get sucked up, contaminating the fuel injectors or filters, leading to engine stuttering or stalling—extremely dangerous if it happens on the road, especially if you break down on the highway. I recommend developing the habit of refueling before the warning light comes on, ideally when the tank is down to a quarter full. This protects the fuel pump, extends its lifespan, and saves you a lot on repairs. Remember, a well-maintained car ensures safer and more worry-free trips—don’t risk major problems for minor savings.
