TROUBLES AI Symptom and Probable Cause Fuel Pump Leaks Fuel a Loose housing screws b Ruptured or torn diaphragm c Loose fittings d Stripped thread on inlet and outlet fittings Symptom and Probable Cause Fuel Pump Leaks Oil a Hole in diaphragm b Damaged oil seal Insufficient Fuel Delivery a Loose fuel line fittings b Damaged diaphragm c Cracked or broken fuel line Fuel Pump Noise a Pump loose at mounting ND REMEDIES Probable Remedy a Tighten housing screws b Install new diaphragm c Tighten fittings d Replace fittings Probable Remedy a Install new diaphragm b Replace oil seal a Tighten fittings b Install new diaphragm c Replace line a Torque fuel pump mounting bolt and tighten lock nut