LOW-PRESSURE FUEL DELIVERY PUMP There are two seals on the drive gear shaft (Fig. 28). The inner seal is used to retain fuel in the pump from leaking past the drive shaft into the engine. The outer seal prevents engine oil from entering the fuel system through the fuel pump. There is a small weep hole located in the pump body to allow for drainage and early warning should either seal begin to leak (Refer to Fig. 25). Fig. 28 Fig. 29 Page 27 SHAFT SEAL PLUG REGULATOR VALVE BORE REGULATOR VALVE 18 SPRING S SCREW REGULATO VALVE SPR SPRING S SCREW ET REGULATO VALVE SPR R ING