As the relatively high frequency equipment used in the maintenance enterprise, the fuel system cleaning machine will inevitably have some faults in the daily use, among which there are many failures caused by improper use, and there are many reasons such as improper design or "water and soil erosion". These different forms of failure, on the one hand, bring inconvenience to the users, on the other hand, some users misunderstand the equipment because of the reasons for the failure or one-sided understanding of the equipment. The common failures and preventive measures of the fuel system cleaning machine are briefly summarized here.