Bleeding Fuel System

X9811
X9811-UN-23AUG88

Pressurized fluid, when released, can penetrate skin causing serious injury. Avoid the hazard by relieving pressure before disconnecting hydraulic or other lines. Tighten all connections before applying pressure. Search for leaks using 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.

Each time the fuel system is opened for servicing (lines disconnected or filters removed) it is necessary to bleed the system.

To prevent damage to the injection pump, DO NOT try to start the engine while carrying out fuel system bleeding procedure.


5075E Tractor with Stanadyne DB4 injection pump1

  1. CQ294694
    CQ294694-UN-25JUL13

    CQ294695
    CQ294695-UN-25JUL13

    Release fuel return line (A).


  2. Ask a second technician to actuate hand pump (B).

  3. When fuel flow is free of bubbles, tighten fuel return line (A).

    Release manual pump and spring will return to normal position automatically.


5075E Tractor with Bosch A4000 injection pump1

  1. CQ294696
    CQ294696-UN-25JUL13

    Release fuel return line (A).


  2. Actuate hand pump (B).

  3. When fuel flow is free of bubbles, tighten fuel return line (A).

    Release manual pump and spring will return to normal position automatically.


5078E, 5085E and 5090E Tractors with Delphi DP100 Injection Pump

  1. CQ294697
    CQ294697-UN-25JUL13

    CQ294695
    CQ294695-UN-25JUL13

    Unfasten fuel bleed screw (A).


  2. Ask a second technician to actuate hand pump (B).

  3. When fuel flow is free of bubbles, tighten bleed screw (A).

    Release manual pump and spring will return to normal position automatically.

  4. Unfasten fuel bleed screw (C).

  5. Ask a second technician to actuate hand pump (B).

  6. When fuel flow is free of bubbles, tighten bleed screw (C).

    Release manual pump and spring will return to normal position automatically.

1 Identify injection pump installed on tractor according to reference in Fuel System Components — 5075E Tractor, in Section Service—As Required.

OU90500,00001EF-19-20131216