Fuel system and method of preventing boiling of ethanol-based fuel at an internal combustion engine driven low pressure fuel pump of a fuel system

摘要

The present invention relates to a fuel system (4) for an internal combustion engine (2) of a vehicle (1) adapted for a fuel having a boiling point below 90°C, the fuel system comprising a main fuel pipe (18) connecting an internal combustion engine driven low pressure fuel pump (12), a fuel tank (11) upstream of the low pressure pump (12), a fuel filter (17) downstream of the low pressure pump (12), and a high pressure pump (19) located downstream of the fuel filter (17), the high pressure pump (19) being configured to supply fuel to an injection system associated with the internal combustion engine. The fuel system (4) comprises a cooling flow recirculation line (15) associated with the main fuel pipe (18) and arranged to recirculate part of the fuel downstream of the low pressure pump (12) and upstream of the high pressure pump (19) back to the fuel tank (11), whereby cooling of the low pressure pump can be obtained especially during an engine brake mode of the vehicle.