Fuel injector system

A fuel injector system comprising:

• a) a high pressure fuel pump, the high pressure fuel pump having,
• a pump housing having an internal, cylindrical slider sleeve with first and second ends, the slider sleeve having a discharge passage assembly in the first end for discharging fuel at high pressure from the pump, and a slidable piston in the second end wherein the piston has an end, and a fuel chamber is formed between the end of the piston and the discharge assembly;
• a fuel passage means for supplying fuel to the pump, the fuel passage means including at least one side entry passage to the fuel chamber;
• actuator means for reciprocating the piston in the sleeve, wherein fuel is supplied to the chamber through the side entry passage and the piston eclipses the side entry passage on displacement by the actuator means, pumping the fuel in the chamber through the discharge passage assembly, the discharge passage assembly including a check valve means for preventing discharged fuel from reentering the fuel chamber, wherein the fuel passage assembly has a stationary discharge tube mounted to the pump housing with an internal passage, the tube being inserted into the first end of the slider sleeve, wherein the housing has an internal cylinder and the slider sleeve is displaceable in the cylinder, the pump having actuating means engaging the slider sleeve for displacing the slider sleeve in the internal cylinder, wherein the volume of fuel displaced by the piston is varied according to the position of the slider sleeve in the housing cylinder;
• and,
• b) a booster pump, the booster pump having,
• a housing connected to the pump housing,
• a booster cylinder with a slidable booster piston in the cylinder, the cylinder in part forming a booster hydraulic chamber,
• a booster actuator means for reciprocating the booster piston in the booster cylinder,
• a displaceable end member in engagement with the slidable piston of the fuel pump, the end member being in hydraulic communication with the hydraulic chamber, wherein the end member and the fuel pump piston have different diameters and the diameter of the end member of the booster pump substantially exceeds the diameter of the fuel pump piston, wherein on reciprocation of the booster piston with hydraulic fluid in the booster chamber the fuel pump piston is displaced, said booster pump comprising the actuator means of the fuel pump.