TM 9-4520-257-12&P                                                      0008 00 0008 00-3 Table 2.  H-45 Type II (Liquid Fuel) Heater Troubleshooting (Operator)-continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Check fuel line from fuel can to fuel flow control for air bubbles. Open primer valve and shake hose assembly to purge air bubbles until a strong flow is achieved. Accumulation of soot in stack pipe. Clean stack pipe in accordance with WP 0020 00. Fuel selector control set incorrectly. Follow the procedures in   WP 0005 00, “Starting the H-45 Type II (Liquid Fuel) Heater”) to determine the correct setting.   Check if heater is being overfired or underfired. If heater is overfired, turn flow adjustment knob on fuel flow control counterclockwise to reduce flow rate. If underfired, turn knob clockwise to increase flow rate.   Check that stack pipe sections are assembled and properly fitted together. Reassemble any opened pipe sections. Tightly reconnect all pipe sections. Check for accumulation of soot in burner cap assembly and burner shell assembly components.   Clean burner cap assembly. Refer to WP 0021 00. Clean burner shell assembly. Refer to WP 0021 00. 2.  Heater does not operate             properly. Make sure that automatic vent on gravity feed adaptor is not blocked with ice or snow Clear obstructions from gravity feed adaptor vent Check to see if fuel setting is too high. Turn fuel setting down. Check to see if fuel selector is on the correct setting. Rotate fuel selector knob to         correct fuel type being used. Check to see if draft doors are open. Open draft doors. Check stack pipe sections for cracks. Replace cracked sections. Check stack for proper number of stack pipe sections. Failure to use all six stack pipe sections will adversely affect heater performance, increase soot buildup, and increase maintenance.  Always use all six sections. 3. Excessive dark smoke Check stack for proper fit between stack pipe sections. Push stack pipe sections together.