Right Fuel Pump Check Valve, Checking

Right Fuel Pump Check Valve, Checking

Test conditions

• Fuel pump relays - 1 - and - 2 - for left and right fuel delivery units must be removed from their sockets.





- Remove locking ring from left sensor flange (fuel filter) using fuel tank sensor key (T10202).





- Carefully pry up sensor flange and raise it slightly.

- Disconnect connector next to fuel filter.

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





- Allow fuel from connecting piece - 1 - to flow back into tank.

- Close pressure gauge shut-off tap (lever at right angles 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 1318/17) as shown.





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

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

- Right fuel pump is faulty. Replace fuel delivery unit.

To modify pressure tester set-up for left fuel pump:

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