Left Fuel Pump Check Valve, Checking

Left Fuel Pump Check Valve, Checking

Test conditions

• Remote control (V.A.G 1348/3 A) is still connected.

• This test checks the connections of the fuel supply line from fuel delivery units to connection point of pressure gauge (V.A.G 1318) for leaks

- Pull fuel supply hose - 2 - from left fuel delivery unit off fuel filter - 1 -.





- Close pressure gauge shut-off tap - arrow - (lever perpendicular to direction of flow).





- Connect pressure tester (V.A.G 1318) with adapter (V.A.G 1318/7), adapter (V.A.G 1318/13) and adapter (V.A.G 1318/24) as shown.





• Ensure that fuel supply line connection engages audibly when joined.

- Connect remote control (V.A.G 1348/3 A) with adapter (V.A.G 1348/3-3) to connection - arrow - for fuel pump relay for left fuel delivery unit.





- Operate remote control at short intervals, until a pressure of approx. 4 bar has built up.

- Watch pressure drop on gauge. After 10 minutes pressure must not drop below a 3.0 bar decrease.

If pressure drops:

- Left fuel pump is faulty. Replace left fuel delivery unit.

- Open lever of pressure tester and let fuel flow back to fuel tank through hose (V.A.G 1318/13).





- Remove pressure gauge (V.A.G 1318) with adapters.