Delivery Quantity, Checking

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Voltage supply is OK.
The fuel pressure regulator and residual pressure is OK. Refer to FUEL PRESSURE REGULATOR AND RESIDUAL PRESSURE, CHECKING .
The fuel filter is OK.

-- Remove the fuel cap from the fuel filler tube.

-- Remove the rear bench seat. Refer to Removal and Installation .

-- Remove the cover -1- from fuel delivery unit. The arrow -2- points in the direction of travel.

Fig 1: Removing Cover From Fuel Delivery Unit

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- First, pull on the connector -arrow- without pressing the retainer to make sure it connected securely. If the connector was not connected correctly, it could cause a fault.

Fig 2: Fuel Pump Control Module Connector

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Disconnect the connector.

-- Check the contacts on the connector and the fuel delivery unit for damage.

-- Install the test instrument adapter/DSO (5-pin) VAS 5565 between the connectors on the fuel delivery unit and cover.

Fig 3: Connecting Remote Control V.A.G 1348/3A To Test Instrument Adapter/DSO (5-Pin) VAS 5565 And To Battery Plus (+)

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Connect the remote control V.A.G 1348/3A to the test instrument adapter/DSO (5-pin) VAS 5565 and to battery positive (+).

NOTE:

This step allows the fuel pump to run when the engine is not running.

The delivery rate of the fuel pump is measured at 4 bar. Therefore, measure the fuel pressure before measuring the delivery rate. Refer to FUEL PRESSURE REGULATOR AND RESIDUAL PRESSURE, CHECKING .

WARNING:

The fuel system is under pressure!

Always wear protective eyewear and protective clothing to prevent injuries and fuel from coming in contact with your skin.
Before loosening line connections, place a cloth around the connection point. Then release pressure by carefully pulling off the line.

-- Disconnect the return line -1- from the fuel pressure regulator.

Fig 4: Installing Adapter Vas 6550/1 To The Fuel Pressure Regulator

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

NOTE:

Press in the securing ring to disengage the fuel line.

-- the adapter VAS 6550/1 to the fuel pressure regulator and hold the other end of the adapter in a measuring container.

-- Operate the remote control V.A.G 1348/3A approximately 5 seconds in order to fill the fuel filter.

-- Empty the measuring container.

-- The fuel pump delivery rate depends on the voltage. So, connect the multi-meter V.A.G 1715 to wires -1 and 5- on the test instrument adapter/DSO (5-pin) VAS 5565.

Fig 5: Connecting Multi-Meter V.A.G 1715 To Wires And Of Test Instrument Adapter/DSO (5-Pin) VAS 5565

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Operate the remote control for 60 seconds and simultaneously measure the voltage of the fuel pump.

-- Compare the quantity of fuel delivered with the specification.

Fig 6: Identifying Graph Of Voltage Versus Delivery Rate

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

*) Minimum delivery rate cm³ /60 s

**) Voltage of the fuel pump with engine running in idle and the pump is on.

Example:

During the test, a voltage of 10.5 volts is measured. This results in a minimum delivery quantity of approximately 1200 cm³ /60 s.

If the minimum delivery rate is not attained:

-- Check the fuel filter as follows:

WARNING:

The fuel system is under pressure!

Always wear protective eyewear and protective clothing to prevent injuries and fuel from coming in contact with your skin.
Before loosening line connections, place a cloth around the connection point. Then release pressure by carefully pulling off the line.

-- Disconnect the fuel supply line -arrow- from the fuel filter.

Fig 7: Fuel Supply Line At Fuel Filter

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Connect the pressure tester VAS 6550 to the fuel supply line using the adapter VAS 6550/1. Hold the other end of adapter VAS 6550/2 in the measuring container.

Fig 8: Connecting Pressure Tester VAS 6550 To Fuel Supply Line Using Hose VAS 6550/1

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Make sure the drain is closed and the shut off levers are open.

-- Operate the remote control V.A.G 1348/3A. Slowly close the shut off lever -A- until the pressure gauge reads 4 bar. From this point on do not move the position of the shut off lever.

-- Empty the measuring container.

-- Repeat the fuel delivery test.

If the minimum delivery rate is now obtained:

-- Replace the fuel filter.

If the minimum delivery rate is again not obtained:

-- Remove the fuel delivery unit and check the fuel strainer for contamination.

Only when up to now no malfunction has been detected:

-- Replace the fuel delivery unit. Refer to FUEL DELIVERY UNIT .

-- Reconnect all disconnected fuel lines.

-- Bleed the fuel supply system. Refer to FUEL SYSTEM, BLEEDING .

Delivery rate has been obtained, but malfunctions are still suspected in the fuel supply, for example sporadic loss of fuel supply:

-- Check the fuel pump current draw. Refer to CURRENT DRAW, CHECKING .