Mitsubishi S4Q2 - 17 Fuel System Bleeding

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Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
FUEL SYSTEM BLEEDING
ENGLISH
FUEL SYSTEM
FUEL SYSTEM
17 FUEL SYSTEM
BLEEDING
1. Fuel filter
1) Loosen air vent plug on the fuel filter (by
turning it 1.5 turns).
2) Unlock bleeding pump plunger by turning it to
the left, and operate the pump.
3) Tighten the air vent plug when the fuel flows
free of bubbles.
2. Fuel injection pump
1) Loosen air vent plug on the injection pump (by
turning it 1.5 turns).
2) Unlock bleeding pump plunger by turning it to
the left, and operate the pump.
3) Tighten the air vent plug when the fuel flows
free of bubbles.
Bleeding button
Air vent plug
Bleeding button
Air vent plug
NOTE
a If the vent plug is tightened before the
bleeding pump plunger is locked, fuel
pressure acts on the feed pump, making it
difficult to restore the plunger.
b Clean up fuel spillage.