Section 5 - Fuel System - Group 05 Fuel Pump - Rebuild (5-02) M11 Page 5-13 Fuel Supply Pump - Test Description of Test The fuel supply pump must pass the specification tests. The self-priming capacity must be high enough to start the engine. The operating flow must be correct. The supply pressure must be regulated for fault-free fuel in- jector performance. The safety shutoff valve must stop the fuel flow at excessive pressures. Installation Install the supply pump assembly on the test stand, Part No. ST-848 or 3375698, with four capscrews. The plumbing of the test stand must be as shown. The minimum size of the supply line is No. 10 with a maximum length of 70 inches.
The minimum size of the drain is No. 5. Connect the correct voltage to operate the shutoff valve. Gear Pump Test Operate the system with the inlet and outlet valves open to remove the air from the pump and the system. Gear Pump Flow Test Adjust the speeds and the inlet and outlet values accord- ing to the table. Check the pump flow. RPM Flow kg/hr [lb/hr] Inlet Restriction mm Hg [in Hg] Outlet Pressure kPa [psi] 600 51 [2.0] 1200 236 [520] 127 [5.0] [130-160] 2100 295 [650] 127 [5.0] [150-180] NOTE: The fuel supply must follow the minimum and maxi- mum pressure guidelines for the correct injector performance. Shutoff Valve Test Remove the air from the pump and system.
Open the inlet restriction and low control valve. Adjust the pump speed to 2400 rpm.