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 10: Engine fuel return restriction. PROBABLE CAUSE CORRECTIVE ACTION a. Engine fuel return hose quick-disconnect coupling not connected. (1) Reconnect coupling (refer to pertinent vehicle technical manual). b. Quick-disconnect coupling, tube or hoses defective or damaged (restricting return fuel flow). (1) Check return fuel flow as follows: PROCEDURE OBSERVATION ANALYSIS Open rear grille doors and remove transmission cover. Disconnect tank fuel return hose quick-disconnect coupling at rear of transmission. Hold quick-disconnect coupling valve open to collect fuel in suitable container. CAUTION Do not operate engine unless coupling valve is held open. Moderate fuel flow from coupling valve (about 1/2 gpm). No restriction. Return fuel flow rate is satisfactory. Start and operate engine at idle speed and collect fuel in suitable container. Trickle or no flow from hose. Fuel flow is insufficient. Pinched or kinked line or quick-disconnect coupling valve defective. PROCEDURE OBSERVATION ANALYSIS Moderate flow. Quick-disconnect coupling valve satisfactory. Remove coupling half from fuel tank tube and connect coupling halves on hose; operate engine. Trickle or no flow. Fuel tank return tube or hose pinched or kinked, or quick- disconnect coupling defective. PROBABLE CAUSE CORRECTIVE ACTION b. (Continued) Quick-disconnect coupling, tube or hoses defective or damaged (restricting return fuel flow). (2) Replace defective coupling tube or hose. WP 0020 00-12