ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
TEST OR INSPECTION
ENGINE CRANKS BUT FAILS TO START ABOVE 50°F (18°C) CONTINUED.
Diesel fuel burns easily. Do not smoke or allow flames nearby. Disconnect batteries when
working on fuel system. Failure to observe these precautions could cause serious injury to
Do not crank engine for more than 20 seconds. Allow starter motor to cool for 2 minutes
between cranking attempts. Cranking too long can overheat and damage starter motor.
Check primary fuel filter (1) for water or dirt contamination as follows: Place a see-through
container underneath draincock (2). Turn draincock (2) counterclockwise and allow fuel to drain
into see-through container. Turn draincock (2) clockwise to close. Observe condition of fuel. Get
rid of drained fuel (page 2-424).
If fuel is contaminated, replace primary fuel filter (1) (page 2-466), secondary fuel filter
(3) (page 2-476), and fuel pump fuel filter (5) (page 2-477). Prime fuel system (page
If fuel is not contaminated, go to step 5.
Unscrew and take off secondary fuel filter (3) and gasket (4), and check for low fuel level.
If fuel level is low, fill secondary fuel filter (3), install new gasket (4), and screw on and
tighten. Prime fuel system (page 2-446).
If fuel level is high, install secondary fuel filter (3) and new gasket (4), and screw on
and tighten. Go to step 6.
Check for fuel at fuel solenoid (6) as follows: Using 9/16-inch and 1/2-inch open-end wrenches,
unscrew and take off fuel line (7). Cover fitting (8) with wiping rag. Have assistant rotate KEY
SWITCH (9) clockwise to on position and press ENGINE START button (10) for 5 seconds.
Check for steady fuel flow from fuel solenoid (6). Have assistant rotate KEY SWITCH (9)
counterclockwise to off position. Take wiping rag off fitting (8).