3-2
Chapter 3 OPERATION
Fuel System - Bleed Air
When bleeding the fuel system, start with the compo-
nent closest to the fuel tank, that is, from the oil-water
separator to fuel filter to fuel injection pump.
Bleeding air from the oil-water separator differs
depending on fuel piping. Bleed air in an appropriate
way.
Bleed air from fuel filter or fuel injection pump using
priming pump.
Fig. 3-1 Priming Pump - Operate
Fuel Filter - Bleed Air
1. Loosen the air vent plug of the fuel filter about 1.5
turns.
2. Move the priming pump up and down to feed fuel.
3. When the fuel from the air vent plug becomes free
from air bubbles, stop priming and tighten the air
vent plug to the specified torque.
Fig. 3-2 Fuel Filter - Bleed Air
Fuel Injection Pump - Bleed Air
1. Loosen the air vent plug on the fuel injection pump
by rotating about 1.5 turns.
2. Move the priming pump up and down. When the
fuel flow from the air vent plug becomes free of
bubbles, turn the priming pump clockwise while
pushing it to lock.
3. Tighten the air vent plug on the fuel injection pump.
Fig. 3-3 Fuel Injection Pump - Bleed Air
When fuel overflows from the air vent plug, wipe
thoroughly with a cloth. Spilled fuel can cause a fire.
After air bleeding, lock the priming pump securely. If
the cap is not locked tightly, the priming pump can be
damaged, causing a fuel leak that could lead to a
fire.
[Unlock] [Prime] [Lock]
Turn counterclockwise
Move cap up
and down
Turn clockwise
while pressing
If air vent plugs, the thread portion of the bracket, or
sealing washers are damaged, replace them with
new ones.
Air vent plug
Tightening torque
8.8 ± 1 N·m
{0.9 ± 0.1 kgf·m}
[6.4 ± 0.7 lbf·ft]
Air vent plug
15 ± 2 N·m
{1.53 ± 0.20 kgf·m}
[11.06 ± 1.48 lbf·ft]
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