The fire engine water pump throttle does not refuel.

1. Blocked oil circuit: Blocked oil circuit will make the throttle unable to refuel. You can check whether there is any foreign body in the tubing or whether there is any problem with the oil quality.

2. Oil pump failure: The oil pump is responsible for transporting oil from the oil tank to the engine. If the oil pump fails, it may cause the throttle to fail to refuel. It is recommended to check whether the oil pump works normally, and repair or replace it in time if it is abnormal.

3. Nozzle failure: The nozzle is responsible for atomizing the engine oil and injecting it into the combustion chamber. If the nozzle fails, it may cause the throttle to fail to refuel. It is recommended to check whether the injector works normally, and clean or replace it in time if it is abnormal.

4. Throttle failure: The throttle is responsible for controlling the mixing ratio of air and fuel. If the throttle fails, the throttle may not be able to refuel. It is recommended to check whether the throttle valve works normally, and repair or replace it in time if it is abnormal.

5. Fuel quality problem: Inferior fuel may cause the throttle to fail to refuel. It is recommended to check the fuel quality and replace it in time if there is any problem.