Liquid fuel pumping apparatus

A liquid fuel pumping apparatus for supplying fuel to an internal combustion engine, comprising an injection pump operable in time relationship with an associated engine, a fuel control rod movable to effect adjustment of the quantity of fuel supplied at each injection stroke, governor mechanism including a governor weight which is driven at a speed dependent upon the speed of the associated engine, a member movable by the weight, a governor spring for opposing movement of the member as the speed of the engine increases, operator adjustable means for adjusting the force exerted by the spring, link means connecting said member with the fuel control rod whereby for a given setting of the operator adjustable means, as the engine speed increases, the fuel control rod will be moved to reduce the amount of fuel supplied to the apparatus, a releasable actuator which, when released, acts to effect movement of the control rod to an excess fuel position, said actuator including a coiled compression spring, a piston which can be subjected to fluid pressure in order to compress the spring, a spring loaded pin to retain the piston, with the pin being operable from the exterior of the apparatus when excess fuel is required, a pivotal arm which can be engaged by said piston when said pin is released, with said arm pivoting under the action of said compression spring and engaging with part of said link means to effect movement of the control rod to the excess fuel position, a maximum fuel stop which acts to limit the movement of the control rod in the direction of increasing fuel during normal operation of the apparatus, and said pivotal arm having means for rendering said maximum fuel stop inoperative prior to the engagement of the arm with said part of the link means.