Fuel pump

Claim 1

A PULSE PUMP FOR A FUEL SYSTEM, SAID PUMP COMPRISING A BODY MEMBER ENCLOSING A CAVITY, A DIAPHRAGM SEALED AROUND ITS PERIPHERY ACROSS SAID CAVITY AND FORMING WITH SAID BODY MEMBER AND AIR CHAMBER ONE ONE SIDE OF SAID DIAPHRAGM AND A FUEL CHAMBER ON THE OTHER SIDE OF SAID DIAPHRAGM, SAID DIAPHRAGM HAVING A MOVABLE PORTION, INLET AND OUTLET PASSAGE THROUGH SAID BODY MEMBER AND OPENING INTO SAID FUEL CHAMBER TO PROVIDE FUEL FLOW THERETHROUGH, AN INLET CHECK VALVE IN SAID INLET PASSAGE AND AN OUTLET CHECK VALVE IN SAID OUTLET PASSAGE, AN AIR PASSAGE THROUGH SAID BODY MEMBER OPENING INTO SAID AIR CHAMBER TO PROVIDE PULSES THERETO, RESILIENT MEANS IN SAID AIR CHAMBER BETWEEN SAID BODY MEMBER AND SAID DIAPHRAGM PORTION TO BIAS SAID DIAPHRAGM INTO SAID FUEL CHAMBER IN A PUMPING STROKE, A VALVE SEAT IN SAID AIR PASSAGE ADJACENT THE AIR CHAMBER AND EXTENDING GENERALLY IN A HORIZONTAL PLANE, AND A FREE FLOATING VALVE DISK WITHIN THE AIR PASSAGE OVER THE VALVE SEAT ADAPTED TO SEAT BY GRAVITY AGAINST HE VALVE SEAT, AND VALVE DISK RESPONSIVE TO PRESSURE WITHIN THE AIR PASSAGE AND BEING UNSEATED UPON A PREDETERMINED NEGATIVE PRESSURE BEING EXERTED IN THE AIR PASSAGE, A POSITIVE PRESSURE IN THE AIR PASSAGE AIDING GRAVITY SEATING OF SAID VALVE DISK SO THAT THE DISK IS SEATED ACROSS SAID AIR PASSAGE UPON MOVEMENT OF THE DIAPHRAGM IN ITS PUMPING STROKE AND IN A OPENED UPON MOVEMENT OF THE DIAPHRAGM IN ITS SUCTION STROKE THEREBY TO CONTROL THE EFFECT OF POSITIVE PRESSURE IN THE AIR PASSAGE ON THE PUMPING STROKE OF THE DIAPHRAGM.