Bleeding the Fuel System

If the engine runs out of fuel, repairs are made to the fuel system, or if air gets into the system for any other reason, the air must be bled out of the fuel system.

Note Make sure the fuel tank vent is kept open. If the vent becomes clogged, a partial vacuum develops in the tank, and this increases the tendency for air to enter the system.

To bleed air from the fuel system:

  1. Loosen the bleed screw about one turn.

  2. Unscrew the priming pump handle and manually prime the fuel system until air bubbles are no longer visible in the fuel coming out of the bleed screw.

  3. Tighten the bleed screw and screw the priming pump handle back in.

  4. Loosen the injection lines at the injection nozzles.

  5. Crank the engine until fuel appears at the nozzles.

  6. Tighten the injection lines.

  7. Start the engine and observe the engine run for a few minutes. If the engine fails to start, or starts but stops in a few minutes, repeat the procedure.

Parent topic: Engine Fuel System