Fuel 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
Fuel Pressure, Checking
CAUTION!
Fuel supply line is under pressure! Wear protective goggles and protective clothing to prevent injuries and contact with skin. Before removing from hose connection wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection.
- Remove fuel supply line - arrow - and catch escaping fuel using a rag.
• Press in securing ring to disengage the fuel line.
- Install the fuel injector pressure gauge (V.A.G 1318) with the adapter set (V.A.G 1318/17A).
- Open shut-off valve of pressure gauge set.
- 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.
If fuel pressure is OK, check retaining pressure => [ Residual Pressure, Checking ]. Residual Pressure, Checking
If the specification is exceeded:
- Pressure relief valve in flange malfunctioning, replace flange with fuel filter => [ (Item 15) Flange with fuel filter ] Fuel Tank, Engine Codes CBFA, CCTA and CCTB, Assembly Overview.
If the specification is not obtained:
- Check the fuel lines for possible restrictions (kinks) or blockages.
If no malfunction can be found:
- Replace flange with fuel filter and pressure relief valve => [ (Item 15) Flange with fuel filter ] Fuel Tank, Engine Codes CBFA, CCTA and CCTB, Assembly Overview.
- Repeat the test.
If specified value is again not obtained:
- Fuel Pump (FP) faulty, replace fuel delivery unit => [ Fuel Delivery Unit, Removing and Installing ] Fuel Delivery Unit, Removing and Installing.