Why does the fuel level decrease after the car has been parked for a few days?
2 Answers
Possible reasons for fuel level decrease after parking the car for a few days include inaccurate fuel level sensor readings (actual tank may be full while gauge shows less than full). Relevant information about automotive fuel tanks is as follows: 1. Introduction: Automotive fuel tank is the full name of car fuel tank. Currently, with the development of automobile industry and the revitalization of domestic automotive industry, major automobile manufacturers are showing significant growth in demand for automotive fuel tanks. 2. Design principle: Utilizing the heat energy generated by the engine during operation, a thermal circulation system is added between the engine, fuel tank, and radiator. The original single tank design is modified into a combined tank system consisting of main tank and auxiliary tank.
Actually this is quite common. My old car used to lose a small fraction of a fuel gauge level after just one week of parking. The main reason is gasoline is highly volatile, especially during hot summer temperatures when fuel molecules slowly escape through gaps and the carbon canister system. Additionally, many modern vehicles have active carbon canister purge programs that continue to draw in fuel vapors adsorbed in the canister even after engine shutdown. If you smell gasoline or notice oil stains on the ground, it might indicate aging fuel line connections are leaking. However, as long as the leakage isn't particularly noticeable, losing one gauge level after two weeks of parking is generally considered normal consumption.
