Bosch VP44 Injection Pump Replacement Removal 1. Disconnect both negative battery cables at both batteries. Cover and isolate ends of cables. 2. Thoroughly clean fuel lines at cylinder head and injection pump ends. Thoroughly clean Bosch VP44 injection pump and supply/return lines at side of pump. 3. Disconnect 9–way electrical connector at Fuel Pump Control Module (FPCM) (Fig. 22). 4. Remove fuel return line at side