Patent ID: 9388779
Filing Date: 2016-07-12
CPC Classification: E02F,F02D,F02M

Claim Text:
1. A fuel system for an excavator comprising: a fuel tank, a water separator, an engine, and fuel supply lines configured to conduct fuel from the fuel tank to the water separator, from the water separator to the engine, and from the engine back to the fuel tank; a hand pump included with the water separator, the hand pump configured such that actuation of the hand pump removes water from the fuel; a fuel supply pump included with the engine, the fuel supply pump configured to pump fuel from the fuel tank, through the water separator, and to the engine; common rail fuel injectors included with the engine and configured to deliver fuel to combustion chambers of the engine; an injection pump included with the engine and configured to pump fuel to the common rail fuel injectors; a fuel control unit that is included with the engine and controls the injection pump, the fuel control unit is configured to: (A) direct fuel from the water separator back to the fuel tank without the fuel flowing to the common rail injectors; or (B) activate the injection pump to direct fuel from the water separator to the common rail fuel injectors and the combustion chambers, the fuel is combusted in the combustion chambers and any fuel remaining after combustion is directed back to the fuel tank; a pressure sensor included with the engine and configured to input fuel pressure readings to the fuel control unit, the fuel control unit is configured to control fuel flow to the common rail fuel injectors based on the fuel pressure readings input to the fuel control unit; a check valve included with the engine, the check valve is positioned along the fuel supply line exiting the engine to the fuel tank and is positioned to receive: (A) fuel that the fuel control unit directed to the common rail fuel injectors; and (B) fuel that the fuel control unit directed around the common rail fuel injectors; wherein: