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Home >> Volkswagen >> 2000 >> EuroVan Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures >> Fuel System >> Fuel Pump Volume Check >> 2.8L VR6 (Engine Code AES)
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2.8L VR6 (Engine Code AES)

  1. Ensure battery voltage is at least 11.5 volts. Ensure fuel pump fuse No. 18 is okay. See Figure . Turn ignition off. Remove fuel filler cap.
  2. Relieve fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE (2.8L VR6, ENGINE CODE AES)  .
  3. Connect Pressure Gauge (VAG 1318), or equivalent, at fuel supply line/hose in engine compartment. Ensure shut-off lever is open (position A), and fuel hose is in a measuring container. See Fig 1 .
    Fig 1: Checking Fuel Pump Volume (Engine Code AES)
    G00283880Courtesy of VOLKSWAGEN UNITED STATES, INC.
  4. Remove fuel pump relay from relay panel. Connect Remote Control Switch (VAG 1348) between battery positive source and fuel pump terminal. See Fig 2 .
    Fig 2: Connecting Remote Control Switch (VAG 1348) To Fuel Pump Terminal
    G00283879Courtesy of VOLKSWAGEN UNITED STATES, INC.
  5. Activate fuel pump with remoter control switch and slowly close lever (A) until pressure is at 44 psi (3 bar). See Fig 1 . Once this pressure is reached, do NOT move lever any further. Empty measuring container.
  6. Connect DVOM to battery terminals. Activate fuel pump for 30 seconds while collecting fuel in measuring container and measure battery voltage. Record fuel volume and battery voltage.
  7. Compare quantity of fuel with specification. See Fig 3 .
    NOTE: Voltage shown in graph in Fig 3 is at fuel pump. Battery volage is about 2 volts more than that measured directly at fuel pump.
    Fig 3: Comparing Fuel Pump Voltage Vrs. Fuel Pump Volume (Engine Code AES)
    G00283881Courtesy of VOLKSWAGEN UNITED STATES, INC.
    8. NOTE: Fuel filter is mounted near fuel tank.
    Fig 4: Testing Fuel Filter For Restrictions
    G00283856Courtesy of VOLKSWAGEN UNITED STATES, INC.
  8. If minimum fuel pump volume is not as specified, check fuel lines for possible restrictions, kinks or blockages. Connect Pressure Gauge (VAG 1318), or equivalent, at fuel filter. See Fig 4 .
  9. Repeat fuel pump volume check. If minimum volume is now reached, replace fuel filter.
  10. Repeat fuel pump volume check. If minimum volume is still not reached, remove fuel pump and check strainer for clogging. If strainer is okay, replace fuel pump.
    NOTE: It is not necessary to drop fuel tank to access fuel pump. Remove driver's seat. Lift carpeting above parking brake lever. Remove fuel pump assembly access plate. See Fig 5 .
    Fig 5: Removing Fuel Pump Assembly
    G00283870Courtesy of VOLKSWAGEN UNITED STATES, INC.
  11. If fuel pump volume is okay, but an intermittent fuel supply problem is suspected, check fuel pump amperage draw. See FUEL PUMP AMPERAGE DRAW  .
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