ENGINE DIAGNOSTIC TEST PROCEDURES
FORM NO. CGED-365
SUFFICIENT CLEAN FUEL
FREE OF WATER
CORRECT GRADE OF FUEL
Sufficient Clean Fuel
If fuel is satisfactory, enter OK in 1st check box. Drain
water or remove foreign substances as required. Record
any corrective action taken in the comments section at
the bottom of the form.
Fuel must be of proper grade, clean, undiluted and free
CHECK FOR AIR IN FUEL: Check for leaks in
the supply line from the tank to the fuel pump. If
in doubt, connect a piece of clear plastic tubing
from the filter to the injection pump inlet. Run
engine and watch for air bubbles - THERE
SHOULD BE NO AIR BUBBLES.
CHECK FOR QUALITY: By-pass the fuel
system. Run the engine with a can of fuel
known to be of good quality. Observe engine
performance. If engine performance is improved
with the use of the sample fuel, clean the system
and refill with proper, clean fuel.
Cold weather can cause fuel waxing of certain grades of
diesel fuel which result in fuel filter plugging.
Refer to the appropriate Engine Operation Manual for
1171 585 R1
Printed in United States of America