Preventing Fuel Leaks: A General Rule to Remember

What is a general rule to prevent fuel leaks in gasoline engines?

A. Always fill the tank to capacity

B. Leave some space for the fuel to potentially expand

Answer:

B. Leave some space for the fuel to potentially expand

As a general rule, it is advisable not to overfill the tank and leave some space for the fuel to potentially expand. Overfilling the tank and drastic changes in temperature are potential causes for fuel leaks in gasoline engines.

When gasoline is filled to capacity in a tank, the surrounding temperature or the heat generated by the engine can cause the gasoline to expand. If the tank is completely full, this expansion may result in a fuel leak as the gasoline searches for additional space. Tank caps are designed to allow air to escape in such situations to prevent damage. However, if the caps are faulty or if the tank is filled on a cold day and then brought into a warm environment, leaks can still occur.

To prevent fuel leaks, it is recommended to not overfill the tank and provide some space for the fuel to expand when necessary. This simple practice can help maintain the integrity of the fuel system and avoid potential leaks.