A pumping apparatus mountable on a mobile cart or shelf for transferring a liquid or slurry pie filling such as is used for pumpkin and custard pie to pre-formed pie crusts within the confines of an oven. The device is used in small 1-3 man bakery in the manufacture of pumpkin or custard pie. The device features a housing having a pump and motor and an inlet pipe to bring the filling to the pump from which it is transferred to other locations within an oven by an outlet hose connected to a loading arm. The flow of filling is controlled by the operator via a switch mounted on the arm.