Fuel Pump Delivery Rate, Checking [For Engine(S): Bub, CBRA]

Special tools and workshop equipment required

Procedure

Observe test conditions, refer to TEST CONDITIONS .

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

TT Coupe:

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

TT Roadster:

-- Remove the right side rear panel trim panel. Refer to Removal and Installation .

All Vehicles:

-- Unclip catches -arrows- of right connector flange cover.

Fig 1: Identifying Cover From Fuel Delivery Unit

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-- Disconnect the connector -arrow- from the locking flange.

Fig 2: Disconnecting Electrical Harness Connector From Fuel Delivery Unit

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-- Connect V.A.G 1348/3A with V.A.G 1348/3-3 with an adapter cable from V.A.G 1594C at terminal -1-.

Fig 3: A Jumper Cable From A Electrical Connector Test Lead Set Connected To Terminal Of The Fuel Delivery Unit And To Vehicle Ground

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-- Cover the second connector terminal of V.A.G 1348/3-3 with insulating tape to prevent short circuit -arrow-.

-- Connect contact -5- to vehicle Ground (GND) using a jumper cable from the V.A.G 1594C.

-- Connect alligator clip to battery positive.

WARNING:

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

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

-- Press the release button and disconnect the fuel return line -arrow-.

Fig 4: Disconnecting Fuel Return Line By Pressing Release Buttons

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-- Connect V.A.G 1318/17-1 to disconnected fuel return line and hold it in a measuring container.

Fig 5: Adapter V.A.G 1318/17-1 Connected To Disconnected Fuel Return Line And Placed In Measuring Container

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-- Press the switch on the remote control for 15 seconds.

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

Fig 6: Delivery Rate Diagram

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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:

Assemble in reverse order of disassembling. Note the following:

TT Coupe:

-- Install rear seat bench. Refer to Removal and Installation .

TT Roadster:

-- Install the right side rear panel trim panel. Refer to Removal and Installation .