TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download
Page 168 of 1563
TM 9-2815-220-24 INTAKE MANIFOLD HEATER ABNORMAL OPERATION 0023 00 MALFUNCTION 1: (Continued) Manifold heater inoperative. PROCEDURE OBSERVATION ANALYSIS Moderate flow indicates solenoid valve is operating properly and check valve is opening properly. With switch in "ON" position, note fuel flow from check valve opening. No fuel or restricted flow indicates check valve stuck closed or filters in solenoid valve are restricted or clogged. See appropriate vehicle technical manual. If fuel flow stops, solenoid valve is closing properly. Return Fuel Solenoid Valve and Check Valve: Remove fuel return solenoid outlet tube after the check valve at rear of engine, operate purge pump and press manifold heater switch "ON" and "OFF". With switch in "OFF" position note that fuel flow stops. If fuel flow continues, solenoid valve is defective (stuck in open position). Replace solenoid. PROBABLE CAUSE CORRECTIVE ACTION Fuel backflow valve Perform pressure tests in work package END OF WORK PACKAGE WP 0023 00-6