Fuel Pump Check Valve, Checking

Checking conditions
- Remote control VAG 1348/3A connected
- Pressure gauge VAG 1318 connected to hose on fuel supply line.

Checking sequence


NOTE: Using this procedure the fuel supply line connections from the fuel delivery unit to the point at which the pressure gauge VAG 1318 is connected will also be checked for leaks.







- Close pressure gauge shut-off tap (lever at right angles to direction of flow, position -B-.
- Operate remote control at short intervals, until a pressure of approx. 3 bar has built-up.
- If pressure builds up too high, lower excess pressure by carefully opening shut-off tap.

WARNING!
A danger of spray exists when opening the shut-off tap. Hold container over the pressure gauge free connection.
- Watch pressure drop on gauge. After 10 minutes pressure must not drop below 2.5 bar.

If the pressure drops further:
- Check line connections for leaks.

If no faulty wiring is detected:
- Fuel pump is faulty, replace fuel delivery unit.