Fig. 3-1 Priming Pump - Handle; Fig. 3-2 Fuel Filter - Bleed Air; Fig. 3-3 Fuel Injection Pump - Bleed Air - Mitsubishi S6B Operation & Maintenance Manual

Chapter 3 OPERATION
Fuel system - Bleed air
When fuel overflow from the air vent plug, wipe thor-
oughly. Spilled fuel causes fire hazard.
After bleeding, lock the priming pump cap securely. If
the cap is not locked tightly, the priming pump can be
damaged, causing a fuel leak that could lead to a
fire.
While feeding fuel with priming pump, bleed air from
the location closest to the fuel tank that is the water
separator, fuel filter, then the fuel injection pump.
Lock the priming pump cap according to "Priming
pump cap tightening method".
Fuel filter - Bleed air
If air vent plugs, the thread portion of the bracket, or
sealing washers are damaged, replace them with
new ones.
1. Loosen the air vent plug on the fuel filter about 1.5
turns.
2. Move the priming pump cap up and down, then
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.
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 cap up and down until the
fuel flow from the air vent plug is free from air bub-
bles. Push and turn the priming pump cap clock-
wise to lock in the original position when the fuel
flows are free from bubbles.
3. Tighten the air vent plug on the fuel injection pump.
3-2
[Unlock] [Prime]
Move cap up
Turn counterclockwise
and down

Fig. 3-1 Priming pump - Handle

Fig. 3-2 Fuel filter - Bleed air

Air vent
plug

Fig. 3-3 Fuel injection pump - Bleed air

[Lock]
Turn clockwise
while pressing
Air vent plug
Tightening torque
8.8 ± 1 N·m
{0.9 ± 0.1 kgf·m}
[6.4 ± 0.7 lbf·ft]
Priming pump