The object of the present invention is to provide an inventive fuel system comprising a low pressure fuel system (4), a high-pressure fuel pump (5), a common rail (6), at least one fuel injector (7), and an engine management system (20). The engine management system (20) may initiate a recirculating cooling fuel flow through the high-pressure fuel pump (5) for avoiding fuel boiling by means of either increasing the target pressure of the fuel within the common rail (6) above a threshold level, which triggers opening a high-pressure fuel relief valve (14), such that fuel supplied by said high-pressure fuel pump (5) is returned to said low pressure fuel system (4) via said high-pressure fuel relief valve (14), or providing increased internal fuel leakage within said at least one fuel injector (7), such that fuel supplied by said high- pressure fuel pump (5); is returned to said low pressure fuel system (4) by a return line (13).