Fuel Pump, Checking

Special tools and workshop equipment required 

• Voltage tester V.A.G 1527 B
• Connector test set V.A.G 1594C
• Vehicle diagnosis, testing, and information system VAS 5051B

Test Conditions 

• The fuses must be OK.
• The battery voltage must be at least 11.5 Volts.
• All electrical consumers like, for example, lights and rear window heating, must be switched off.

Function and Voltage Supply, Checking 

-- Switch ignition on.

• Fuel Pump (FP) must briefly start up audibly.

-- Switch off ignition.

If Fuel Pump (FP) Does Not Start Up 

-- Remove seat bench Removal and Installation .

-- Unclip cover -1- from fuel delivery unit. Arrow -2- points in direction of travel.

Fig 1: Identifying Fuel Delivery Unit Cover

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Disconnect the connector -1-.

Fig 2: Identifying 4-Pin Connector, Black Supply Line And Blue Return Line From Fuel Delivery Unit

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Connect voltage tester V.A.G 1527 B using adapter cables from connector test kit V.A.G 1594C to outer terminals of connector.

Fig 3: Identifying Voltage Tester V.A.G 1527 B Connected With Adapter Cables To Outer Terminals Of Connector

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Switch ignition on.

• LED must light up briefly.

If LED does not light up briefly:

-- Locate and repair open circuit in wiring.

LED lights up briefly (voltage supply OK):

-- Fuel delivery unit, removing FUEL DELIVERY UNIT .

-- Check if the electrical wiring between the flange and fuel pump is connected and has continuity.

If no open circuits are found:

-- Replace fuel delivery unit FUEL DELIVERY UNIT .

Fuel Pump Current Draw, Checking 

-- Remove seat bench Removal and Installation .

-- Unclip cover -1- from fuel delivery unit. Arrow -2- points in direction of travel.

Fig 4: Identifying Fuel Delivery Unit Cover

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Connect current probe -A- of vehicle diagnosis, testing and information system VAS 5051B on cable -B- to terminal 1 of 5-pin harness connector.

Fig 5: Identifying Current Probe Connected To Terminal 1 Of 4-Pin Harness Connector

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Start the engine and run at idle speed.

-- Measure Fuel Pump (FP) current draw:

• Specified value: max. 7.5 amps.

-- If the measured value is greater than the specified value:

-- Replace fuel delivery unit FUEL DELIVERY UNIT .