Bleeding Fuel System, John Deere POWERTECH® 8.1 L Engine

    Bleed the fuel system:

  • After every filter change
  • Whenever the fuel tank has run dry
  • After repair work on the fuel system
  • If the engine has been idle for a longer period

1. Drain water and contaminates from water separator bowl (A) by opening drain (B).

2. Connect JT03472 coupler and hose to diagnostic port (C). If JT03472 coupler is not available, loosen the diagnostic port to allow air and fuel to escape. Bleed fuel into suitable container.

NOTE: Hand primer must be pulled all the way up between pumps.

3. Unlock and operate hand primer (D) until a steady flow of fuel (without bubbles) flows out of hose.

NOTE: It can take up to 200 strokes until fuel comes out steadily.

4. Continue to pump hand primer while disconnecting JT03472 coupler from diagnostic port, or while tightening diagnostic port to specification.

Specification

Diagnostic Port -Torque 14 N·m (10 lb-ft)

5. Start engine and run engine at high idle.

6. If engine fails to start, loosen high pressure fuel lines (E). Pump hand primer (D) until steady flow of fuel escapes the fuel pump. Tighten fuel lines to specification and lock hand primer (pull up, then push down and lock).

Specification

High Pressure Fuel Lines -Torque 27 N·m (20 lb-ft)

ZX1030877
ZX1030878
ZX1030879


A-Water Separator Bowl
B-Drain Valve
C-Diagnostic Port
D-Hand Primer
E-High Pressure Fuel Lines

POWERTECH is a trademark of Deere & Company.

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7. Start engine. If engine fails to start, repeat step 6.

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