Fuel system e.g. for internal combustion engine has high pressure fuel pump with pump element and mechanism whereby mechanism has orifice for absorbing pressure surges

摘要

The fuel system (100) has high-pressure fuel pump (1) with a pump element (21) and a mechanism (30'). The mechanism has an orifice for absorbing pressure surges. The orifice has a resistance coefficient depending on the fuel flowing in the flow direction. The resistance coefficient of the orifice is smaller in a conveying direction than in a reverse flow direction.