实践发现,采用直流泵供应甲醇时其使用寿命较供应汽油时大幅缩短。为探索原因，对已损坏的大量甲醇泵进行了故障统计，并从电化学腐蚀的角度分析了甲醇泵正负极不均匀腐蚀的现象和机理;自行设计了简易的醇泵试验台，通过醇泵耐久性试验验证了理论分析的正确性。结果表明: 直流泵正负极线路之间发生了类似“阴极保护”的电化学作用，加速了正极线路的腐蚀并使负极线路得到保护。基于此，测试并分析了电液分离式和电液一体式无刷泵耐醇特性，指出将电液一体泵正负极铜丝与流体分离是提高直流泵耐醇能力的可行措施。

Previous practical studies showed that the life of DC pumps substantially reduced when supplying methanol compared with supplying gasoline. To explore the reason,the fault statistics was made on a large number of damaged nethanol pumps,while the phenomenon and mechanism of the non-uniform corrosion between the positive and negative electrodes were analyzed from the point of electrochemical corrosion. A simple methanol pump test bench was designed and durability tests of methanol pumps were performed using the bench,the theoretical analysis was verified to be correct. The results show that a kind of electrochemical action,which was similar with cathodic protection,happened between the positive and negative circuit of the DC pump. This effect accelerated the corrosion of the positive line but protected the negative line at the same time. Based on this,testing and analyzing were made on both the integrated and separate electro-hydraulic pump. It is pointed out that separating both the positive and negative copper wires from the fluid for the electro-hydraulic integration pump is a feasible way to improve the methanol-resistant capability of the DC pump.