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 ENGINE FAILS TO START AT NORMAL CRANKING SPEED 0008 00 MALFUNCTION 1: (Continued) Cylinders not firing (insufficient fuel or incomplete combustion). PROCEDURE OBSERVATION ANALYSIS Solenoid Valve(s) Operation NOTE Disconnect purge pump fuel hose quick-disconnect coupling at engine before performing test. Evidence of action indicates normal solenoid valve operation. Press heater switch intermittently "ON" and "OFF". Note audible "click" or opening and closing valve action (by touch) of both solenoid valves (fuel supply and fuel return). No audible "click" or action indicates solenoid valve(s) is defective. Fuel System Checks Moderate flow with each stroke indicates normal purge pump operation. Purge Pump: Disconnect purge pump fuel hose quick disconnect coupling at engine main fuel backflow valve. Hold coupling valve open and operate purge pump. Note fuel with each firm stroke of purge pump. If flow is not evident, purge pump is defective, or purge lines are blocked or leaking. Moderate flow with each stroke indicates no in-line filter restriction. Filter satisfactory. Fuel Filter: Disconnect fuel tube between fuel check valve tee and manifold heater fuel filter and operate purge pump. Note fuel flow with each stroke of purge pump. No flow, or restricted flow, indicates in-line filter is plugged. Fuel flow indicates solenoid valve is operating properly and fuel filters are satisfactory. Solenoid Valve and Fuel Filter: Disconnect one fuel tube from engine front solenoid valve outlet tree, operate purge pump and press heater switch "ON" and "OFF". With switch in "ON" position, note fuel flow from tee opening with each purge pump stroke. No fuel or restricted flow indicates manifold heater filter or felt filters in solenoid valve are restricted or clogged. WP 0008 00-3