Reprime Bosch VP44 Injection Pump The Fuel System Cummins This is an article on how to reprime the Bosch VP44 Injection fuel system on a 24V Dodge Ram Turbo Cummins. A certain amount of air becomes trapped in the fuel system when fuel system components on the supply and/or high-pressure side are serviced or replaced. Primary air bleeding is accomplished using the electric fuel transfer (lift) pump. If the vehicle has been allowed to run co