Transfer Fuel Pump - G6- /Fuel Pump - G23-, CHECKING, VEHICLES WITH 6.0L (V12) ENGINE

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Special tools and workshop equipment required

Injection Rate Comparison Meter Kit - Remote CableVAG1348/3A with Injection Rate Kit - Remote Cable VAG1348/3-3.

Fig 1: Identifying Remote Control Connection V.A.G 1348/3A
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Measuring container, fuel-resistant

Procedure

Fig 2: Identifying Left Plenum Chamber Cover -1- Above E-Box

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Follow all test requirements, refer to TEST CONDITIONS .

Follow the guidelines for clean working conditions, refer to CLEAN WORKING CONDITIONS .

-- Remove the cap from the fuel filler tube.

-- Open the left plenum chamber cover -1- above the E-box.

-- Turn the quick-release fasteners -1, 3 and 4- counter-clockwise 90° -arrows-.

Fig 3: Turning Quick-Release Fasteners -1, 3 And 4- Counter-Clockwise 90Degrees -Arrows- To Remove Relay/Fuse Holder Cover -2-

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-- Remove the relay/fuse holder cover -2-.

-- Remove the fuses for both fuel pumps in the relay/fuse holder in the E-box on the left side of the plenum chamber. Refer to the appropriate Wiring Diagram.

Fig 4: Locating Relay And Fuse Carrier In Left E-Box Plenum Chamber

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-- Connect the Injection Rate Comparison Meter Kit - Remote Cable VAG1348/3A with Injection Rate Kit - Remote Cable VAG1348/3-3 to the left terminal -arrow 1- and -arrow 2- for the socket for both fuel pump fuses. Refer to the appropriate Wiring Diagram.

Fig 5: Removing Engine Cover

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-- Release the clip and open the positive terminal pick-off cover -A-.

-- Connect alligator clip to positive terminal pick-off.

-- Remove the engine cover -arrows-.

Fig 6: Remove Engine Cover

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NOTE:

Place a clean cloth under the separating location to catch any fuel that may leak out.

Fig 7: Fuel Supply Hose Location

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WARNING:

Very hot fuel can burn your skin.

In extreme cases, the fuel lines and the fuel itself in vehicles with a common rail engine can be as hot as 100 °C after the engine has been turned off. Let the fuel cool down before opening any line connections otherwise there is a danger of scalding.
Wear safety gloves
Wear protective eyewear.

There is a risk of injury because the fuel is under pressure.

To reduce pressure in fuel system, lay a clean cloth around the connector and carefully loosen connector.

CAUTION:

Always observe the rules for cleanliness when working on the injection system, refer to CLEAN WORKING CONDITIONS .

-- Loosen the clamp and disconnect the fuel supply hose -1- from the fuel tank.

-- Attach a hose extension to the fuel supply hose -arrow- and hold it in a measuring container.

Fig 8: Hose Extension Location

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-- Press tand hold he switch on the remote control for 15 seconds.

Fig 9: Fuel Delivery Diagram

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-- Compare quantity of fuel delivered with minimum delivery rate in diagram (cm³ /15s).

NOTE:

Voltage at fuel pump with engine stopped and pump running is approximately 2 volts less than battery voltage.

If minimum delivery quantity is not obtained, the following malfunctions may be present:

The fuel tank does not have enough fuel in it.
The fuel lines are pinched.
One of the two fuel pumps is faulty.

NOTE:

This test does not test the throughput of the fuel filter. Test the filter separately, if necessary.