The engine of China v3 refueling door has bubbling sound.

The reasons for air leakage at the fuel filler door may be: 1, air leakage at the starting device; 2. The gas supply and exhaust system is out of order; 3. The three-way catalytic converter is broken in some places; The air inlet is blocked. The solution to the problem of air leakage at the oil filler door: 1, overhaul the starting device; 2. Repair or replace the three-way catalytic converter; 3. Clean the air inlet. The accelerator system consists of accelerator pedal, pedal displacement sensor, ecu electronic control unit, data bus, servo motor and accelerator actuator. The working principle of the throttle system is to send the electric signal of the gear where the throttle knob is located to the controller. The controller gives the throttle actuator current according to the setting information stored in the gear, and the throttle actuator controls the fuel intake and speed of the engine according to the current.