Bleeding Fuel System, John Deere POWERTECH® 8.1 L Engine

causym CAUTION: 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 that 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, a doctor familiar with this type of injury must surgically remove it 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.

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

When fuel filters are being removed or replaced they must be prefilled. See "Replacing Fuel Filter Elements, John Deere POWERTECH 8.1 L Engine".

In case the engine has run out of fuel, see "Restarting Engine That Has Been Run Out of Fuel, John Deere POWERTECH 8.1 L Engine".

X9811

POWERTECH is a trademark of Deere & Company.

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IMPORTANT: When draining water from fuel filters, the drain valve must be unthreaded completely and drop down approximately 12 mm (0.5 in.) to properly drain water from filter.

1. Drain water and contaminates from water separator bowl by opening the drain valve (A) on the primary (D) and secondary (E) filters.

2. Prefill fuel filters (C) using prefill cup (B).


A-Drain Valve
B-Prefill Cup
C-Fuel Filter
D-Primary Fuel Filter
E-Secondary Fuel Filter

RG13269

Drain Valve on Fuel Filters

RG13296

Prefilling Fuel Filter

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3. Loosen the fuel outlet (A) of the transfer pump. Unlock and operate hand primer (B) until a steady flow of fuel (without bubbles) flows out of connection. This could take 270 - 330 strokes until steady fuel flow is free of air bubbles. Retighten fuel line.

Specification

Fuel Outlet Lines -Torque 24 N·m (18 lb-ft.)

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

5. Continue to pump hand primer while disconnecting JT03472 coupler from diagnostic port.

6. Loosen the high-pressure fuel supply line (C) and operate the hand pump until a steady flow of fuel (without bubbles) flows out. Tighten the high-pressure fuel supply line to specification.

Specification

High Pressure Fuel Supply Line -Torque 24 N·m (18 lb-ft.)

7. Loosen one of the high-pressure fuel supply lines (D) and operate the hand pump until a steady flow of fuel (without bubbles) flows out. Tighten the high-pressure fuel supply line to specification.

Specification

High Pressure Fuel Supply Line -Torque 24 N·m (18 lb-ft.)

8. Loosen fuel line fitting on fuel rail flow limiter #6 (E). Place rag around fitting to absorb fuel. Pump hand primer (B) until steady flow of fuel escapes the flow limiter. Tighten fuel line to specification.

Specification

Fuel Line Fitting on Fuel Rail Flow Limiter #6 -Torque 24 N·m (18 lb-ft.)

9. Pump hand primer approximately 30 more times. Lock hand primer (B) (pull up, then push down and lock).

10. Crank engine up to 15 seconds. If engine does not start, wait 15 seconds and then crank for an additional 15 seconds. If engine starts, run at 1200-1500 rpm for 3-5 minutes.

ZX1035988


A-Fuel Transfer Pump Outlet
B-Hand Primer
C-High Pressure Fuel Supply Line
D-High Pressure Fuel Supply Line
E-Fuel Line Fitting on Fuel Rail Flow Limiter #6

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11. If engine fails to start, loosen fuel line fitting on flow limiter #6. Place rag around fitting to absorb fuel. Pump hand primer (B) until steady flow of fuel escapes the flow limiter. Tighten fuel lines to specification below and lock hand primer (pull up, then push down and lock).

Specification

High Pressure Fuel Supply Line -Torque 24 N·m (18 lb-ft.)

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