Bleed Fuel System

T147678B
T147678B-UN-19NOV01

T147652B
T147652B-UN-03DEC01

1 - Primer Pump

2 - Final Fuel Filter Bleed Screw

The fuel system must be primed after performing service procedures on the fuel system, or whenever the fuel tank has been drained or run dry and refilled.

  1. Ensure that all fittings are tight.

  2. Ensure that the fuel tank is at least 1/4 full.

  3. Loosen final fuel filter bleed screw (2).

  4. Operate primer pump (1) until fuel flows freely from bleed screw without air bubbles.

  5. Tighten final fuel filter bleed screw.

  6. NOTE: The primer knob must be unscrewed to allow operation. Always tighten primer knob after operation.

    Operate primer pump until a significant increase in resistance is felt, indicating that fuel has filled the gallery of the injection pump.

  7. NOTE: Engine may start while air is still present in one or more injection lines. In this case, engine may run “rough” until remaining air is pushed out of the fuel system. Operate engine at slow idle for one minute. If engine operation “smoothes” within one minute of operation, it is not necessary to bleed the remaining injection lines.

    Attempt to start the engine. If engine starts, it is not necessary to perform the rest of this procedure. If engine does not start, continue with procedure.

  8. T148674B
    T148674B-UN-03DEC01

    3 - Connector Fitting

    Loosen fittings (3) connecting TWO of the injection lines to the injection nozzles. Turn fittings counterclockwise one full turn. DO NOT completely disconnect fittings.


  9. CAUTION: Escaping fluid under pressure can penetrate the skin causing serious injury. Avoid the hazard. Keep bystanders away from machine while cranking the engine.

    If an accident occurs, see a doctor immediately. Any fluid injected into the skin must be surgically removed within a few hours or gangrene may result. Doctors unfamiliar with this type of injury should reference a knowledgeable medical source.

    Turn key switch to start position. Starter motor should crank. DO NOT start engine. Operate starter motor until a small amount of fuel flows from each loosened injection nozzle fitting.

  10. Tighten all connections.

  11. Repeat steps 2—6 for the remaining fuel injection lines until the engine starts. In some cases it may not be necessary to bleed the fuel system at all injection lines.

  12. Check for leaks at all filters and fittings. Tighten only enough to stop leaks. If leaks cannot be stopped, see your authorized dealer.

OUO1043,0000E23-19-20011030