Left Pump Check Valve, Checking

Left Pump Check Valve, Checking

Test conditions
- Remote control V.A.G 1348/3 A is still connected.

NOTE: 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.

NOTE: 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.