Abstract: A fuel system for supplying fuel to a compression ignition engine includes an accumulator in which fuel is stored at high pressure. The fuel being supplied to the accumulator from a high pressure cam actuated pump which includes pumping plungers operable in timed relationship with the associated engine. The apparatus also includes a distributor member having a delivery passage which can register with outlet ports in turn. Valve means is provided and this is operable in a first setting to connect the high pressure pump to the delivery passage so that fuel is supplied at a low rate to the associated engine and a second setting in which the accumulator is connected to the delivery passage to achieve a high rate of fuel delivery to the engine.

Abstract: A fuel injection pump of the rotary distributor type has angularly adjustable stop rings which limit the outward movement of the pumping plungers so as to control the maximum fuel output of the pump. The stop rings have an outwardly extending curved stop surface so that the maximum fuel output can be altered by altering the angular setting of the rings. The latter portion of the stop surface is arranged to curve outwardly at a greater rate so that as the engine speed increases the plungers no longer follow paths determined by said surface so that the maximum fuel delivery of the pump decreases.

Abstract: A liquid fuel injection pumping apparatus includes a plunger movable inwardly in a bore to deliver fuel, by the action of a roller and a cam. An adjustable stop ring is provided to limit the extent of outward movement by the plunger and hence the maximum amount of fuel which can be supplied to the associated engine. The ring is positioned by a piston upon which liquid under pressure can act. The liquid under pressure is supplied by a low pressure pump and is admitted to one end of a cylinder containing the piston through a restrictor. The pressure downstream of the restrictor is controlled by a valve which includes a valve member spring biased into contact with a seating against the action of the pressure downstream of the restrictor. The air pressure in the engine inlet manifold is applied to a diaphragm and the force developed assists the action of the spring biasing the valve member.

Abstract: A fuel injection pump of the rotary distributor type including a pump plunger the outward movement of which can be limited by an angularly adjustable stop ring to determine the maximum amount of fuel supplied by the pump. The stop ring is moveable from a first position to a second position to enable the pump to supply an excess amount of fuel for starting the engine. A first torsion spring biases the stop ring to the first position and a second torsion spring biases the ring to the second position and is stronger than the first torsion spring. Means is provided to remove the force exerted by the second torsion spring when the supply of the extra amount of fuel is no longer required. This means can be a fluid pressure operable piston.

Abstract: A fuel injection pumping apparatus comprises a rotary distributor member mounting a pumping plunger in a transverse bore. A cam ring is provided to impart inward movement to the plunger as the distributor member rotates and the cam ring is movable angularly in accordance with speed by a fluid pressure operable device. Stop rings are mounted on the opposite sides of the cam ring and these are angularly adjustable to alter the allowed outward movement of the plunger. The stop rings are connected by a bridging member mounting a peg. The peg mounts a lever having a cam surface engageable with a stop member and the lever is movable by means of the cam ring so that the setting of the stop rings varies with speed.

Abstract: A fuel pumping apparatus includes an injection pump and means for controlling the quantity of fuel delivered by the pump. A two speed governor including an operator adjustable control is provided to determine the setting of said means. Stop means is provided to determine the maximum amount of fuel which can be supplied by the injection pump and this is movable from a first position in which an excess of fuel can be supplied for starting purposes to a second position in which the normal maximum amount of fuel can be supplied. The stop means is moved to said first position when the operator adjustable control is moved to the engine idling position but is moved to said second position as the operator adjustable control is moved away from the idling position.

Abstract: A fuel injection pumping apparatus includes a housing having a boss portion through which extends a drive shaft. An adjustable member is mounted about the boss portion and a two part sprocket is mounted on the shaft. One part of the sprocket has an aperture which can be aligned by a tool, with an aperture in the member. Assuming that the member is correctly adjusted, the tool is inserted into the apertures and the driving belt or chain engaged with the part of the sprocket. When the engine and driving belt are in the correct position the sprocket parts are secured together so that the shaft is correctly positioned relative to the engine.