Patent ID: 7216634

Claim:
A DME fuel supply device for a diesel engine, comprising: an injection pump for delivering DME fuel supplied from a fuel tank via a feed pipe in a specified amount to an injection pipe in communication with a fuel injection nozzle of a diesel engine at specified timing; an oil separator for separating DME fuel mixed with lubricating oil in a cam chamber of the injection pump from the lubricating oil; a communication passage adapted to retrieve DME fuel separated by the oil separator to said fuel tank; suction means disposed in the communication passage for pumping a vapor phase part in said cam chamber via said oil separator; cam chamber pressure regulating means disposed between said suction means disposed in said communication passage and said oil separator for maintaining the pressure in said cam chamber at a specified pressure or above; a bypass passage routed around the cam chamber pressure regulating means and directly communicating said cam chamber and said suction means; and bypass passage opening means for opening the bypass passage.