Fig. 3-1 Priming Pump - Handle; Fig. 3-2 Fuel Filters (Wire-Element Type); Fig. 3-3 Fuel Filter - Bleed Air - Mitsubishi S12A2-PTA2 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 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 are the water
separator, fuel filter, then the fuel injection pump.
Lock the priming pump according to "Priming Pump
Tightening Method".
Fuel Filters (Wire-element Type) - 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 of the fuel filter (wire-ele-
ment type) about 1.5 turns.
2. Turn the priming pump counterclockwise to unlock,
and prime the fuel filter.
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 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 of the fuel filter about 1.5
turns.
2. Move the priming pump up and down, then feed fu-
el.
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.
3-2
[Unlock] [Prime]
Turn counterclockwise

Fig. 3-1 Priming Pump - Handle

Fig. 3-2 Fuel Filters (Wire-element Type) - Bleed Air

Fig. 3-3 Fuel Filter - Bleed Air

[Lock]
Move cap up
and down
Turn clockwise
while pressing
Air vent plug
Air vent plug
Tightening torque
8.8 ± 1 N·m
{0.9 ± 0.1 kgf·m}
[6.4 ± 0.7 lbf·ft]