Residual Pressure, Checking
Fuel Pump, Checking
Special tools, testers and auxiliary items required
• Wrench (T10202)
• Pressure gauge (V.A.G 1318)
• Adapter (V.A.G 1318/1)
• Adapter (V.A.G 1318/11)
• Hose adapter (V.A.G 1318/16)
• Adapter (V.A.G 1318/17A)
Special tools, testers and auxiliary items required
• Double connection (V.A.G 1318/23)
• Torque wrench (40 to 200 Nm) (V.A.G 1332)
• Remote control connection (V.A.G 1348/3A)
• Connector test set (V.A.G 1594C)
• Multimeter (V.A.G 1715)
• Test instrument adapter/DSO (5-pin) (VAS 5565)
• Voltage tester (V.A.G 1527B)
• Measuring container
Residual Pressure, Checking
• Fuel pressure OK and pressure gauge (V.A.G 1318) connected. Checking fuel pressure => [ Fuel Pressure, Checking ]. Fuel Pressure, Checking
- Switch ignition on often until fuel pressure on pressure gauge no longer rises.
- Read off fuel pressure on pressure gauge. Specified value: 3.5 to 6.0 bar.
- Watch pressure drop on gauge. After 10 minutes the pressure must not drop below a 3.0 bar decrease.
If the pressure drops further:
- Switch ignition on often until fuel pressure on pressure gauge no longer rises.
- Switch ignition off and immediately close pressure gauge shutoff valve. Lever will then point in position - B -.
If the pressure drops again:
(Leak on engine side)
- Check fuel pipe to high pressure pump for leaks.
If no malfunction can be found:
- Replace high pressure pump => [ High Pressure Pump, Removing and Installing ] High Pressure Pump, Removing and Installing.
If pressure no longer drops now:
(Leak on fuel tank side)
- Check fuel line to flange => [ (Item 15) Flange with fuel filter ] Fuel Tank, Engine Codes CBFA, CCTA and CCTB, Assembly Overview for leaks.
If no malfunctions are found on fuel line:
- Check-valve in flange with fuel filter malfunctioning, replace flange with fuel filter => [ (Item 15) Flange with fuel filter ] Fuel Tank, Engine Codes CBFA, CCTA and CCTB, Assembly Overview.