TM 10-3930-641-34-1
ENGINE TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. ENGINE CRANKS BUT WILL NOT START OR IS HARD TO START
Step 1. Check fuel supply.
Add fuel.
Step 2. Cranking speed is too slow. Check batteries for weak charge or faulty batteries.
a. Charge batteries. (See TM 10-3930-641-20.)
b. Replace faulty batteries. (See TM 10-3930-641-20.)
Step 3. Inspect fuel filter.
Install new elements. (See TM 10-3930-641-20.)
Step 4. Inspect fuel lines for dirt or breaks.
Clean or replace fuel lines.
Step 5. Test fuel transfer pump.
When starting engine, fuel transfer pump discharge should be a minimum of 30 psi (205 kPa). If discharge pressure is less than 20 psi
(140 kPa), check for air in system or dirty fuel filter. If fuel pressure is still low, remove and repair fuel transfer pump. (See page 3-58.)
Step 6. Check for bad quality fuel.
a. Replace fuel.
b. Replace fuel filter element. (See TM 10-3930-641-20.)
Step 7. Check fuel injection timing.
Adjust fuel ratio control. (See page 3-75.)
Step 8. Inspect fuel shut-off solenoid.
Replace/repair fuel shut-off solenoid. (See TM 10-3930-641-20.)
Step 9. Inspect fuel bypass valve.
Clean valve of restrictions.
Step 10. Check valve clearance.
Adjust to specified valve clearance. (See page 3-268.)
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