A method for operating a j-47912 diesel fuel system and assembly or running out of fuel in which the system has a filter that allows the extraction of fuel into the tank. The system is provided with a fuel priming connection to the injection pump inlet, a closing connection to close the connection when not in use. A mechanically open check valve, such as a schrader valve, is a preferred form of closure. The system is primed by the reverse flow of fuel from the filter to the priming connection in the fuel tank to eliminate air trapped from the system. The engine can then be started with minimal cranking. The engine can be restarted after running out of fuel to operate a normal feed pump while partially filling the tank and bleeding air from the system through a priming connection, which starts the engine Closes first. The engine can be reopened after shutdown if required.