The water temperature sensor, steam filter, steel wire and spark plug have all been changed, and the throttle valve has been cleaned, but it is still impossible to refuel.

The water temperature sensor is an auxiliary sensor, which usually works during cold start and cold start. Replacement has nothing to do with your refueling or not.

It's interesting to replace the steam filter, but I think you should check whether the oil supply pressure is normal before deciding whether to replace it. If you replace it now, you can't guarantee the normal pressure of your fuel system. If the oil supply pressure is low, it will still lead to a difference in starting speed.

The cylinder line and spark plug were changed, which basically solved the power shortage caused by high pressure and weak fire.

Throttle cleaning is mainly related to idle speed, but not to acceleration.

Final judgment: 1. There is something wrong with the fuel system of this car. It should be cleaned without disassembly.

2. It may be poor exhaust.

3. There may be something wrong with the ignition timing.