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Check the listing for details. For Detroit Series 60 Engine Fuel System Check Valve Replacement Part 23509140. Condition: New. Listed at 16.83 USD. OE: 23516919, 23509140. for Detroit Diesel 23509140. Reducing vapor lock: By preventing fuel backflow, it effectively reduces the risk of vapor lock formation in the fuel system. Preventing fuel backflow: This is the core function of the for Detroit fuel check valve.