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Pump failure reasons: In general, the machine pump is very reliable, even if a fault, often caused by rupture of diaphragm oil shortage. Sometimes oil pump arm or spring worn over, can also cause oil shortage, the fault easier to identify. Old-style oil pump can be repaired, but the new oil pump because they can not be disassembled, once the failure of the new. Maintenance methods: 1, first check the pump body drive diaphragm push rod is damaged with your fingers gently block the pump inlet, try starting the engine, this time if you feel attractive to prove that putter intact. 2, fingertips are not sucking, indicating that the putter is damaged, the fuel pump should be replaced as a whole. Electric fuel injection pump work, if issued a powerful pump oil, indicating that the pump intact, if there is no pump oil sound, indicating the fuel pump failure.