High pressure fuel pump

A high pressure fuel pump for a gasoline direct injection fuel equipment of an internal combustion engine, said high pressure fuel pump comprising:

• a body provided with a pumping bore extending along a pumping axis and defining, at an end, a compression chamber which volume is cyclically varied by a piston reciprocating in said pumping bore;
• an inlet conduit controlled by an inlet valve;
• an outlet conduit controlled by an outlet valve, said outlet valve being normally closed and only opening when the pressure in the compression chamber exceeds a first predetermined threshold, thereby enabling pressurised fuel to be expelled into the outlet conduit;
• and
• a pressure relief valve (PRV) normally closed and only opening to enable a return flow from the outlet conduit back to the compression chamber when the pressure in the outlet conduit exceeds a second predetermined threshold superior to the first predetermined threshold, said PRV comprising a resilient valve member and a seat and being arranged in an elongated PRV chamber extending parallel and offset to the pumping bore, said elongated PRV chamber being sealed at an end by a plug member;
• wherein said elongated PRV chamber extends to a blind bottom end;
• and
• wherein said seat is defined in said plug member such that said seat is formed on an inner end face of said plug member which faces toward said blind bottom end and such that said PRV is located between said seat and said blind bottom end.