TM     10-3930-638-24&P 2-9. ENGINE TROUBLESHOOTING (cont) MALFUNCTION TEST  OR  INSPECTION CORRECTIVE   ACTION 3. ENGINE STARTS BUT WILL NOT RUN (cont) WARNING Step 3. Step  4. Step 5. Step 6. Step 7. If NBC exposure is suspected, all air filter media should be handled by personnel wearing protective equipment. Consult your unit NBC Of- ficer or NBC NCO for appropriate handling or disposal procedures Check for air in fuel system. a. Place ignition switch in on position.  Open bleed valve plug on top of secondary fuel filter allowing air to bleed out of both filters. When fuel, free of bubbles, starts to flow, close bleed valve plug and wipe parts free of fuel. Turn ignition switch off b. If no air in fuel system, proceed to step 4 below. Check for clogged fuel filters by disconnecting fuel line between fuel filter head and fuel injection pump at fuel injection pump. Place ignition switch in ON position and crank engine. Fuel should be pumped out of disconnected line. a. If fuel is not pumped out of disconnected line, reconnect fuel line and service fuel filters (para 2–15e and 2–15f). b. If fuel is pumped out of disconnected line reconnect line and proceed to step 5 below. Check for incorrect or contaminated fuel in fuel tank (if contaminated, fuel will have a milky white color- ing). a. If fuel is contaminated, drain fuel tank, clean fill with correct fuel (para 2-1 5d (1)) and replace fuel filters (para 2–15e and 2-15f). (Refer to current lubrication order for correct fuel.) b. If fuel is not contaminated, proceed to step 6 below. Check throttle cable movement as an assistant depresses and releases accelerator. a. If movement is not observed, repair or replace throttle/accelerator pedal linkage (pars 2- 15i) b. If movement is observed, proceed to step 7 below. Disconnect wire at fuel injection pump terminal. With ignition switch in ON position, check for +24 Vdc between  wire  and  chassis  ground. a. If +24 Vdc is obtained, reconnect wire to terminal and crack (open) a fuel injector line at fuel injector pump Crank engine and check if fuel is pumped through  fuel  injection  pump. 2-16 Change   5