Mitsubishi S12A2 — Prime the fuel system
Maintenance · Fuel filter and fuel injection pump
For the Mitsubishi S12A2, from the Mitsubishi owner's manual.
Applies to: Mitsubishi S12A2, Mitsubishi S12A2 engine
Before you start
- After priming, lock the priming pump cap securely; looseness can cause fuel leakage and fire hazard
Procedure
- Loosen the air vent plug on the fuel filter about 1.5 turns.
- Turn the priming pump plunger left to unlock and move it up and down.
- Operate until fuel flows free of bubbles, then tighten the air-vent plug.
- Prime both right and left fuel filters simultaneously.
- Loosen the air vent cap on the fuel injection pump about 1.5 turns.
- Move the priming pump cap up and down until bubble-free fuel comes out.
- Lock the priming pump cap while holding it down, then tighten the air vent plug.
- Prime both right and left fuel-injection pumps simultaneously.
Specs & values
- Lock priming pump cap; tighten by wrench 120 to 150 degrees after hand-tight
Full service-parts list: Mitsubishi S12A2 →
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.