How do I bypass the safety control in order to bleed ?

Wire pump electric motor directly to 120 volt source with a patch cord or extension cord. Make dang sure the ignition transformer and all other electric components are disconnected in the wiring area below the transformer. NOTE!! Write down how it all was wired together BEFORE disconnecting all the wires. Make sure that once all the air is gone that you can disconnect the wiring powering the pump motor quickly. You do not want a belly full of oil when you light her off.