Fuel supply apparatus for a diesel engine.

摘要

A fuel supply apparatus for a diesel engine includes a fuel tank (11) and a fuel injection pump (12). The fuel injection pump (12) has an inlet and an overflow outlet. A fuel feed line (14) connects the fuel tank (11) to the inlet of the fuel injection pump (12). A fuel feed pump (20) is disposed in the fuel feed line (14) to supply fuel from the fuel tank (11) to the fuel injection pump (12). A fuel filter (13) is disposed along the fuel feed line (14). A main fuel return line (17) connects the overflow outlet of the fuel injection pump (12) to the fuel tank (11). An auxiliary fuel return line (18) connects the overflow outlet of the fuel injection pump (12) to the fuel feed line (14) at a position upstream of the fuel filter (13). A control valve (19) is disposed in the auxiliary fuel return line (18) to selectively block the latter. A device drives the control valve (19) in response to the temperature of fuel in the fuel filter (13) so that the control valve (19) will block the auxiliary fuel return line (18) only when the temperature of fuel in the fuel filter (13) is higher than a preset value.