Mitsubishi — Bleeding the fuel system
Maintenance
From a Mitsubishi owner's manual — check it applies to your exact model before use.
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Before you start
- When fuel overflows from the air vent plug, wipe thoroughly with a cloth. Spilled fuel is a fire hazard.
- After bleeding, lock the priming pump cap securely.
Procedure
- Bleed air at fuel filters and then at the fuel injection pump. Bleed from upstream to downstream.
- Loosen the air vent plug on the fuel filter intake for the left bank cylinder about 1.5 turns.
- Turn the priming pump cap counterclockwise to unlock, and prime the fuel filter.
- When fuel from the air vent plug is free from air bubbles, stop priming and tighten the air vent plug to the specified torque.
- Loosen the air vent plug on the fuel filter outlet for the left bank cylinder about 1.5 turns, and bleed as described above.
- Bleed the fuel filters for the right bank cylinders as described above.
- Loosen the air vent plug on the fuel injection pump about 1.5 turns.
- Move the priming pump cap up and down until the fuel flow from the air vent plug is free from air bubbles.
- Push and turn the priming pump cap clockwise to lock in the original position.
- Tighten the air vent plug on the fuel injection pump.
- Repeat the same procedure for the fuel injection pump on the other side.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Air vent plug torque: 7.8 to 9.8 N-m (0.8 to 1.0 kgf-m) {5.7 to 7.2 lbf-ft}
Source: Mitsubishi owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.