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TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download

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TM 9-2815-220-24 FUEL SYSTEM ABNORMAL CONDITIONS 0020 00 MALFUNCTION 4: In-tank fuel pump deficiencies. PROBABLE CAUSE CORRECTIVE ACTION a. Electric circuit defective or electric motor failure. (1) Check operation as follows: PROCEDURE OBSERVATION ANALYSIS Electric pump operation is audible (left and right fuel tanks). Pump(s) is operative. Open top grilles. Turn master switch and in-tank fuel pump switch to "ON". Pump(s) operation is not audible. Pump(s) is inoperative. PROBABLE CAUSE CORRECTIVE ACTION (2) Check electric circuit (refer to pertinent vehicle technical manual). Repair as required. a. (Continued) Electric circuit defective or electric motor failure. (3) Replace pump assembly (refer to pertinent vehicle technical manual). b. Pump output insufficient (defective pump or screen clogged). (1) Check pressure and output as follows: PROCEDURE OBSERVATION ANALYSIS Pump Operational Check Electric pump operation is audible (left and right fuel tanks). Pump(s) is operative. Open top grilles. Turn master switch and in-tank fuel pump switch to "ON". Pump(s) operation is not audible. Pump(s) is inoperative. Pump Fuel Pressure Check Install pressure test gauges: 100 psi gauge in fuel/water separator filter cover bleeder valve opening (WP 0084, Fuel/Water Separator Automatic Drain System and Wiring Harness Replacement). 10 psi gauge in primary filter cover bleeder valve opening (WP 0086, Primary Fuel Filter Replacement). Turn master and in-tank fuel pump switches "ON". Less than 5 PSI at both fuel/water separator and primary fuel filters. In-tank pump is operative. Operate engine at high-idle speed (2500-2640 rpm). Zero psi at fuel/water separator filter, and zero psi at primary fuel filter. In-tank pump(s) inoperative or fuel line restriction. Pump Output Check (Fuel Flow Capacity): Open left grille doors. Disconnect fuel tank supply hose quick- disconnect coupling valve at engine. Open coupling valve (hold open) to collect fuel in suitable container (5 gallon). Turn master and in-tank fuel pump switches "ON". WP 0020 00-3