Should You Fill Up a New Car's Tank Completely?
2 Answers
Because the temperature of fuel varies when the vehicle is parked versus when it is in motion, the seasonal and environmental conditions under which the vehicle operates differ. If the fuel tank is overfilled, gasoline may expand due to heat and overflow from the tank opening, which is unsafe. Typically, the fuel tank should have a 5~7% expansion space reserved to ensure driving safety. If the tank is too full, there will be no space left at the top of the tank, especially in summer when gasoline vaporizes. This can lead to a lack of space for the vapor, potentially causing fuel choking. If the vehicle's fuel tank is overfilled (visible fuel at the tank opening), the tank's vent will be submerged in gasoline, forcing liquid fuel into the carbon canister and causing damage to it.
Filling up the tank immediately with a new car is indeed a common issue, and personally, I think it's better to be cautious. The fuel tank of a new car may contain residual impurities or deposits from the factory, and filling it up completely could push these contaminants into the fuel system, potentially causing clogged injectors or malfunctions. It's advisable to start by filling the tank halfway, drive a few hundred kilometers to test the car's condition, and then gradually fill it up if no issues arise. This approach helps protect the engine and filters, extending the vehicle's lifespan. Additionally, regularly checking fuel quality is crucial—don't compromise performance by using low-quality fuel to save money. The break-in period is key to new car maintenance, and adjusting driving habits along with moderate fueling makes it easier to spot potential issues. Moreover, considering fluctuating fuel prices, filling only half the tank can reduce initial cost pressures, especially since new car expenses are already significant. In short, safety comes first—don't take shortcuts by filling up right away.
