TEST OR INSPECTION, AND CORRECTIVE ACTION
TEST OR INSPECTION
ENGINE ROTATES BUT FAILS TO START
Step 1. Check main fuel supply line valves are open and fuel supply level inadequate.
Step 2. Check fuel pump for damaged drive shaft or drive coupling. insert end of 1/8 inch
diameter wire through one of the pump flange drain holes. Crank engine
momentarily ;note if slight vibration is felt in wire.
If wire vibrates, drive shaft is all right. If no vibration is felt, replace fuel pump.
Fuel spraying on hot components is an extreme fire
hazard. Control leakage immediately to prevent injury.
Step 3. Check for air in fuel system.
a. Disconnect fuel return line and drain into a bucket.
Protective fan screens must be installed prior to doing
maintenance in the engine compartment when engine
is running or when engine is in ground hop mode.
Contact with rotating fan can cause injury (reference
b. Crank engine momentarily. Observe fuel return flow. Uneven flow or bubbles
in fuel indicate air in fuel system.
Step 4. Check for contaminated fuel (water in fuel).
a. Drain and clean fuel strainer and filter.
b. Replace with new element as required
(Refer to vehicle type-20 maintenance