The Face runs continually unlike say an SU which has a pressure switch. I suggest you fit a pressure regulator and adjust it to suit your engine's fuel system. Mel 24 January 2022 at 10:32 AM #6935 BartRatkiewiczParticipant The Face runs continually unlike say an SU which has a pressure switch. I suggest you fit a pressure regulator and adjust it to suit your engine’s fuel system. Mel