Abstract: A drywall tool filling pump includes a pump head removably attached to the top end of a pump cylinder positioned inside a bucket of drywall mud. Left and right hinge members extend from the pump head. A plunger shaft extends coaxially from the pump head. A lever has a proximal end pivotally attached to the top of the plunger shaft, and is positionable on either side of the pump head. A pair of connecting rods pivotally connect an intermediate portion of the lever to either hinge member. An output port arranged on the pump head may be connected to a variety of automatic drywall tools. A L-shaped mounting bracket has a top end attached to the output port, and extends downwardly for being positioned outside the bucket. A valve cap is attached to the lower end of the pump cylinder by bolts that extend through longitudinal slots on the cylinder, so that the valve cap may be easily removed by loosening the bolts, and sliding them out the slots.