Right Pump Check Valve, Checking

Right 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.

NOTE: 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.