(1) Remove the air in the fuel pipeline, the specific method: loosen the oil return bolt of the oil pump to drain the clean air, if necessary, loosen the high-pressure oil pipe, and use the starter to drive the engine to idle to drain the clean air; 

(2) Troubleshooting the electrical system, specific method: check each single cell in the electrolyte level, if necessary to add distilled water or replace the battery;

（3） Check whether the intake system is blocked. If so, the air filter and intake pipe must be cleaned or replaced. In addition, for the problem that the oil level in the tank is too low when it is difficult to start, the tank should be filled up to eliminate the trouble of starting or not starting.