Fuel injection pump

Claim 1

A FUEL INJECTION PUMP FOR AN INTENRAL COMBUSTION ENGINE HAVING AN INJECTION PISTON AND A REGULATING SPOOL FOR TERMINATING EACH FUEL DELIVERY STROKE OF SAID PISTON BY ADVANCING UNTIL IT OPENS A SPILL PASSAGE, AN AUXILIARY PUMP ADAPTED TO OPERATE IN SYNCHRONISM WITH SAID PISTON FOR ADVANCING THE REGULATING SPOOL DURING EACH PUMPING STROKE AGAINST THE FORCE OF A REGULATING SPRING, THE REGULTING SPRING RESTING AGAINST AN ELASTICALLY YIELDABLE ABUTMENT WHOSE MOVEMENT IS HYDRAULICALLY DAMPED, AND A THROTTLE THROUGH WHICH FUEL IS DISPLACED BY THE REGULATING SPOOL UPON ITS RETURN MOVEMENT, SAID THROTTLE BRAKING SUCH RETURN MOVEMENT SO THAT WHEN A CERTAIN SPEED IS REACHED THE REGULATING SPOOL IS PREVENTED FROM RETURNING TO ITS INITIAL POSITION PRIOR TO BEGINNING OF THE SUBSEQUENT PUMPING STROKE OF SAID INJECTION PISTON OWING TO THE "LIQUID STOP" PHENOMENON, AND THE AMOUNT OF FUEL DELIVERED BY THE INJECTION PISTON DURING EACH WORKING STROKE IS REDUCED.