12 PERIODIC SERVICE ENGLISH B Air bleeding the fuel system [PROCEDURE ] (fuel tanks lower than injection pump) 1. For fuel tanks that are lower than the injection pump. The fuel system must be pressurized by the fuel system electric fuel pump. 2. If an electric fuel pump is not used, you must manually actuate the pump by lever to bleed. 3. The primary fuel filter 3 must be on the pressure side of the pump if the fuel tank is lower than the injection pump. 4. To bleed follow (2) through (5) above. (PROCEDURE A ) B To avoid personal injury: A Do not bleed a hot engine as this could cause fuel to spill onto a hot exhaust manifold creating a danger of fire.
Air bleeding of the fuel system is required if; A after the fuel filter and pipes have been detached and refitted; A after the fuel tank has become empty; or A before the engine is to be used after a long storage. A Tighten air vent plug of the fuel injection pump except when bleeding, or it may stop the engine suddenly. [PROCEDURE ] (gravity feed fuel tanks only) 1. Fill the fuel tank to the fullest extent. Open the fuel filter lever. 2. Loosen air vent plug of the fuel filter a few turns. 3. Screw back the plug when bubbles do not come up any more. 4. Open the air vent plug on top of the fuel injection pump. 5. Retighten the plug when bubbles do not come up any more.
A [TANK BELOW INJECTION PUMP SYSTEM] [GRAVITY FEED SYSTEM] (1) Fuel tank below injection pump (2) Pre-filter (3) Electric or Mechanical pump (4) Main Filter (5) Injection pump (1) Air vent plug (2) Injection pump (3) Fuel filter CAUTION