Fuel Pump: Testing and Inspection

WARNING: Fire hazard. DO NOT smoke or have anything in area that can ignite fuel.

Requirements

- voltage supply OK

- Remote control VAG 1348/3A connected

- Fuel pressure gauge VAG 1318 or equivalent.

Test Preparation

- Remove fuel filler cap

Fuel Gauge Connection:

- Disconnect fuel supply line 1 from fuel rail

- Connect pressure gauge VAG 1318 to fuel supply line 1 using adaptor VAG 1318/10

Testing

- Attach hose to pressure gauge adaptor VAG 1318/11 and hold in measuring glass

- Open pressure gauge shut-off valve

- Lever parallel with direction of flow (position A)

- While operating remote control VAG 1348/3A, slowly close shut-off valve until pressure gauge indicates a reading of 3 bar

- Stop moving shut-off valve

- Empty measuring glass

- Operate remote control switch for 30 seconds

Fuel Volume Graph:

- Compare amount of fuel delivered with values shown in chart

NOTE:

- Minimum delivery in cc's per 30 seconds

- Voltage at fuel pump with engine not running and fuel pump energized, must be approximately 1 Volts less than battery voltage

If minimum delivery is not obtained:

- Check for kinked or blocked fuel lines

- Check for plugged fuel filter, replace if necessary

- Check if fuel pump defective, replace if necessary