ENGINE CRANKS BUT FAILS TO START OR IS HARD TO START ABOVE 32F (0C) (cont) -624880103

TM 5-2420-222-20-1

ORGANIZATIONAL TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

3. ENGINE CRANKS BUT FAILS TO START OR IS HARD TO START ABOVE 320F (0C) - CONTINUED

WARNING

Although ignition lock switch must be on and battery ground cable connected to test electrical circuit

voltage, turn off ignition lock switch and disconnect battery ground cable before doing resistance tests

or replacing parts. This will keep you from getting shocked and prevent damage to parts and

equipment.

Step 7.

Using multimeter set to 30 vdc scale, place red probe on solenoid terminal (1) and black probe on

fuel metering pump (2). Have assistant turn ignition lock switch (3) clockwise to ignition. Check for

11 to 13 vdc on multimeter. Have assistant turn ignition lock switch (3) counterclockwise to off.

a. If multimeter reads 11 to 13 vdc, notify Direct Support Maintenance.

b. If multimeter reads less than 11 vdc, repair wire from solenoid terminal to ignition lock switch

Step 8.

Check for air in fuel system by priming fuel system (page 2-340).

a. If air was in fuel system, problem should be corrected.

b. If no air was in fuel system, go to step 9.

Step 9.

Inspect fuel lines (4, 5, and 6) for kinks and sharp bends.

a. If fuel filter-to-fuel metering pump fuel line (4) has kinks or sharp bends, replace (page 2-292).

b. If fuel pump-to-fuel filter fuel line (5) has kinks or sharp bends, replace (page 2-288).

c. If fuel shutoff valve-to-fuel pump fuel line (6) has kinks or sharp bends, replace (page 2-264).

d. If all lines are undamaged, go to step 10.

WARNING

No open flames, welding, grinding, smoking, or use of heat producing devices permitted near fuel tank

and fuel lines during maintenance unless the fuel tank has been cleaned and purged of all flammable

liquids and vapors. Fuel burns easily and fumes are explosive. Keep battery disconnected. Failure to

observe these precautions could cause serious injury.

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