Bleeding Fuel System

CAUTION:

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Keep Skin Away from High-Pressure Fluids

Escaping fluid under pressure can penetrate the skin causing serious injury. Relieve pressure before disconnecting fuel or other lines. Tighten all connections before applying pressure. Keep hands and body away from pinholes and nozzles which eject fluids under high pressure. Use a piece of cardboard or paper to search for leaks. Do not use your hand.

If ANY fluid is injected into the skin, it must be surgically removed within a few hours by a doctor familiar with this type injury or gangrene may result. Doctors unfamiliar with this type of injury may call the Deere & Company Medical Department in Moline, Illinois, or other knowledgeable medical source.

IMPORTANT: Do not operate the engine at high speeds or full loads just before bleeding the fuel system as this may cause fuel injection pump failure.

Bleed the fuel system anytime the fuel system has been opened up. This includes:

  • After fuel filter changes.
  • After pump or nozzle replacement.
  • Anytime fuel lines have been disconnected.
  • After engine has run out of fuel.

Bleed the fuel system using the following procedure:

  1. Loosen the air bleed vent screw (B) two full turns.

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    Air Bleed Screw and Fuel Supply Pump Primer Lever

    A - Fuel Supply Pump Primer Lever

    B - Air Bleed Screw


  2. On mechanical supply pumps, operate supply pump primer lever (A) until fuel flow is free from air bubbles.

  3. On electric supply pumps, turn key switch to “ON” position until fuel flow is free from air bubbles.

  4. Tighten bleed screw securely by hand. Continue operating hand primer until pumping action is not felt. When finished, pull hand primer upward as far as it will go.

  5. Start engine and check for leaks.

    If engine does not start, it may be necessary to bleed air from fuel system at the high-pressure fuel pump.

  6. Disconnect high-pressure pump fuel inlet line (A).

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    High-Pressure Fuel Pump

    A - Fuel Inlet Line


  7. Attach a fuel line to the fuel inlet line (A), and place other end in a 3.8 L (1.0 gal.) or larger container.

  8. Manually prime the mechanical transfer pump until discharge stream of fuel into bucket is present without air bubbles.

  9. Reinstall fuel inlet line and prime the high-pressure fuel pump.

  10. With the ignition ON and the engine OFF, manually prime the mechanical transfer pump.

  11. Crank the engine for 15 seconds. If engine does not start, perform step 6—10 as necessary. If engine does not start, see your John Deere dealer.

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