Fuel System-Bleeding

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.

causym CAUTION: High-pressure fluid remaining in fuel lines can cause serious injury. Only technicians familiar with this type of system should perform repairs. Before disconnecting 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, wait a minimum of 15 minutes after engine is stopped.

IMPORTANT: Do not attempt to pressurize the fuel tank with compressed air or any other means. Fuel tank and surrounding structural damage could result.

NOTE: Fuel priming pump will need to be primed before it will pump.

Install DFRG6 Electric Fuel Priming Pump

NOTE: DFRG6 Electric Fuel Priming Pump is used to aid in bleeding fuel system. See Section 199 for a list of components required to install pump.

1. Remove plug (A) and install RE193349 fitting into filter header.

TS1343
N68826
N68825


A-Plug
B-Positive Terminal

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2. Connect output hose of DFRG6 Electric Fuel Transfer Pump to fitting RE193349 fitting in filter header.

3. Install input hose into container of fuel. Place fuel container higher than fuel pump for better priming results.

4. Connect power wire to positive terminal (B) on alternator with switch off and find a clean ground point for ground connection.

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Bleed Fuel System

1. Turn on DFRG6 Electric Fuel Priming Pump and loosen the fuel outlet (A) of the transfer pump until a steady flow of fuel (without bubbles) flows out of connection. If electric priming pump is not used then 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 to specification.

Specification

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

2. Loosen the high-pressure fuel supply line (C) and operate pump until a steady flow of fuel (without bubbles) flows out. When using the electric priming pump, the hand pump will need to be used to assist. Tighten the high-pressure fuel supply line to specification. Repeat this step for high-pressure fuel supply line (D).

Specification

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

3. Loosen fuel line fitting on fuel rail flow limiter #6 (E). Place rag around fitting to absorb fuel. Operate pump until steady flow of fuel escapes the flow limiter. Tighten fuel line to specification.

Specification

Pressure Limiter -Torque 24 N·m (18 lb-ft)

4. Operate electric pump for an extra 10 seconds or pump hand primer approximately 30 more times. Lock hand primer (B) (pull up, then push down and lock).

5. Remove electric pump, drain lines back into tank. Remove RE193349 hose fitting and install plug into filter header.

X9811
N68827


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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NOTE: While engine is running check all fittings for leaks.

6. 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.

7. If engine fails to start, loosen fuel line fitting on HPCR 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 Lines -Torque 24 N·m  (18 lb-ft)

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