19
PRIMING THE FUEL SYSTEM
Priming the fuel system fills the fuel filters and
removes any air bubbles from the fuel system. This
must be performed before the first use, after any fuel
filter maintenance or if the fuel system is run dry.
To prime the fuel system:
On the water separator:
1. Using a 1/2” wrench, loosen the vent screw
(A, Figure 2) on the water separator 2-3
revolutions.
2. Unscrew the priming hand pump (B) located on
top of the water separator. Operate the hand
pump up and down until fuel that is free of air
flows from the vent.
3. Tighten the vent screw to 4.5 ft/lbs (6 N.m.).
DO NOT OVER TIGHTEN!
On the engine fuel filter:
1. Using the appropriate size wrench, loosen the
vent screw (C) on the engine fuel filter 2-3
revolutions.
2. Operate the hand pump up and down until fuel
that is free of air flows from the vent.
3. Tighten the vent screw to 4.5 ft/lbs (6 N.m.).
DO NOT OVER TIGHTEN!
On the engine injector pump:
1. Using a 13mm wrench, loosen the vent screw (D)
on the fuel inlet 2-3 revolutions.
2. Operate the hand pump up and down until fuel
that is free of air flows from the vent.
3. Tighten the vent screw to 4.5 ft/lbs (6 N.m.).
DO NOT OVER TIGHTEN!
4. Tighten the priming fuel pump finger tight.
5. Start the engine. (See STARTING THE ENGINE).
If the engine will not start, further priming is
necessary. If the engine starts but misfires
or continues to emit smoke, further priming is
necessary.
6. If the engine starts but runs rough, continue to
run the engine at low idle until the engine runs
smoothly.
WARNING
Fuel leaked or spilled onto hot surfaces or
electrical components can cause a fire. To
help prevent possible injury, turn the ignition
switch off when changing fuel filter or water
separator element. Clean up fuel spills
immediately.
Figure 2. Fuel System Priming
A. Water Separator Vent Screw
B. Priming Hand Pump
C. Engine Fuel Filter Vent Screw
D. Injector Pump Vent Screw
D
A
B
C
Operation
Not
for
Reproduction
