In view of the difficulty of starting a TBD234V12 diesel engine in a power station,this paper based on the ignition and combustion mechanism of cylinder fuel,analyzed the fuel system and electronic governor system that affect the start-up of diesel engine,and determined that the cause of the difficulty in starting the diesel engine is the failure of the manual fuel pre-supply pump.By disassembling the manual fuel pre-supply pump,this paper found that:first,the rubber sealing ring failed and caused loose sealing and serious oil and air leakage,secondly,cotton threads wrapped the 2 one-way valves inside the manual fuel pre-supply pump,causing loose closure and pump oil pressure drop.This paper repaired the engine by replacing parts and verified the result by starting a test run.
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