The present invention relates to a fuel injection pump having a variable pressure chamber which can adjust a fuel injection timing according to each engine load with a simple structure and a lower manufacture cost compared to the conventional injection pum...

A pressurisation pump (10) is provided comprising a first plunger (12a,12aF,12b) and a second plunger (12a,12aP,12b), each plunger being reciprocable within a respective plunger bore (26,28) defined by a housing (14), wherein the first and second plungers ...