Bleed the Fuel System (Engines with Electronic Fuel Systems and Denso High Pressure Common Rail) (4045HF475, 6068HF475)

CAUTION:

TS1343
TS1343-UN-18MAR92

High-Pressure Fuel Lines

X9811
X9811-UN-23AUG88

High Pressure Fluids

High-pressure fluid remaining in fuel lines can cause serious injury. Do not disconnect or attempt repair of fuel lines, sensors, or any other components between the high-pressure fuel pump and nozzles on engines with High Pressure Common Rail (HPCR) fuel system. Only technicians familiar with this type of system can perform repairs. (See your John Deere dealer.)

Escaping fluid under pressure can penetrate the skin causing serious injury. Avoid hazards by relieving pressure before disconnecting hydraulic or other lines. Tighten all connections before applying pressure. Search for leaks with a piece of cardboard. Protect hands and body from high pressure fluids.

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 may call the Deere & Company Medical Department in Moline, Illinois, or other knowledgeable medical source.

Any time the fuel system has been opened up for service (lines disconnected or filters removed), it will be necessary to bleed air from the system.

IMPORTANT: NEVER pressurize the fuel tank to prime the fuel system as it could rupture seals in the injection pump.

NOTE: These are the 4-valve cylinder head 4.5 L and 6.8 L “475” model engines with Denso HP3 pumps and High Pressure Common Rail (HPCR) fuel systems (decal on rocker arm cover marked “16V” or “24V”).

IMPORTANT: Four valve cylinder head engines are especially sensitive to fuel contamination. Do not crack any fuel lines to bleed the fuel system.

  1. RG12220
    RG12220-UN-24MAY02

    Final Fuel Filter Bleed Vent Screw

    A - Bleed Vent Screw

    Loosen the air bleed vent screw (A) two full turns by hand on fuel filter base.


  2. RG12221
    RG12221-UN-24MAY02

    Fuel Supply Pump Primer Lever

    B - Primer Lever

    Operate fuel supply pump primer lever (B), or primer button on fuel filter base (if equipped), until fuel flows out of bleed vent screw.


  3. Tighten bleed vent screw securely. Continue operating primer until pumping action is not felt.

  4. Start engine and check for leaks.

    If engine will not start, repeat steps 1-4.

OURGP11,000000F-19-20060727