Reasons for the blockage of the fuel filter:
1. Gasoline pump filter clogging, gasoline filter clogging and fuel injector clogging to varying degrees will also cause insufficient fuel supply;
2. In addition, the filter screen on the fuel pressure regulator is blocked, resulting in poor fuel return, which will cause the fuel system pressure to be too high, and the mixture will be too thick;
3. Too lean and too rich mixture will cause insufficient engine power and cause towering. The mixture is too lean: If the towering phenomenon is not felt on flat roads or to a lesser degree during driving, and it feels obvious or heavier when going uphill, it can be judged that the mixture is too lean.

The clogging of automobile fuel filter includes:
1. It is easy to stall. After the gasoline filter is blocked, the delivery of gasoline is affected, resulting in insufficient fuel supply to the engine. The phenomenon of car rubbing is obvious during driving or shifting, and it is easy to cause flameout when idling;
2. Weak driving. Due to poor fuel supply, the engine power is reduced, the vehicle is weak and the speed of the vehicle is reduced;
3. The engine jitters when idling, and the gasoline filter is moderately blocked, which not only does not make the car power worse, but also causes engine jitter when the car is idling.