FUEL SYSTEM AND METHOD FOR REDUCING FUEL LEAKAGE FROM FUEL SYSTEM

摘要

1. A fuel system (1) for supplying compressed fuel, in particular dimethylether or its mixture, to an internal combustion engine containing a fuel pump (4), the mechanism (10, 11) of which is partially located in the crankcase (16) containing lubricating oil, and a drain line (24) connected to the crankcase (16) for removing at least fuel vapor from the inner space of the crankcase (16), characterized in that it further comprises: a lubricating oil supply line (22) connected to the crankcase (16) ; lubricating oil supply valve (31) installed in the feed line (22) oil lubricant; sealing means (21) installed between the pump mechanism (10, 11) and the crankcase (16) to prevent at least lubricating oil from escaping out of the crankcase (16); a drain valve (30) installed in the drain line ( 24); moreover, the drain valve (30) and the lubricating oil supply valve (31) are designed to be controlled so that they are closed when the engine is not running, to prevent leakage of fuel vapor from the crankcase (16) .2. The fuel system according to claim 1, characterized in that at least with the engine idle, the level (20) of lubricating oil in the crankcase (16) is provided so that the sealing means (21) is completely immersed in the lubricating oil to further improve the sealing of the crankcase (16 ) for fuel vapors. 3. The fuel system according to claim 1, characterized in that the lubricating oil supply valve (31) is a spring-loaded shut-off valve that provides flow of lubricating oil in only one direction. The fuel system according to claim 3, characterized in that the valve (31) for the supply of lubricating oil is configured to