Should the fuel tank have fuel when a car is parked for a long time?

[DelilahLee]

If the car is parked for several months, the fuel should be drained or kept to a minimum. Here are the relevant details: 1. Impact: Among the quality indicators of gasoline, there are two key metrics—actual gum and induction period—which represent the stability of gasoline. When gasoline is stored for too long, it undergoes severe oxidation, forming gum. This gum can cause valves to stick and not close properly, and at high temperatures, it decomposes into carbon deposits that accumulate on the cylinder walls, piston tops, and cylinder heads, leading to poor engine performance, knocking, and increased wear. 2. Gasoline: Gasoline is a volatile, flammable hydrocarbon mixture liquid derived from petroleum through distillation and cracking, used as fuel. It appears as a transparent liquid, is flammable, and has a distillation range of 30°C to 220°C.