Fuel Pressure Regulator and Residual Pressure Checking, Engine Code BPR
Fuel Pressure Regulator and Residual Pressure Checking, Engine Code BPR
• Observe the safety precautions. Refer to => [ Safety Precautions ] Multiport Fuel Injection.
• Observe the rules for cleanliness. Refer to => [ Clean Working Conditions ] Multiport Fuel Injection.
Special tools, testers and auxiliary items required
• Fuel inj. pressure gauge-cis (VAG 1318)
• Valve adapter (VAG 1318/9)
• Adapter (VAG 1318/17)
• Fuel line feed adapter (VAG 1318/23)
• Remote control (VAG 1348/3A)
• The fuel pressure regulator regulates the fuel pressure to approximately 4 bar.
• The fuel pressure regulator is located on fuel filter (in the fuel tank).
=> [ Residual Pressure, Checking ]
=> [ Fuel Pressure Regulator, Checking ]
Residual Pressure, Checking
- Fold the rear seat bench forward.
- Remove the cover from fuel delivery unit.
- Disconnect the 4 pin connector - 1 -.
CAUTION!
Fuel system is under pressure!
• Wear protective goggles and protective clothing to prevent injuries and contact with skin.
• Before loosening the line connection, place a cloth around the connection point. Then release pressure by carefully loosening the line connection.
- Disconnect the fuel supply line - 3 - and catch the leaking fuel with a cleaning cloth.
• Press the securing ring to disengage the line.
- Connect the (VAG 1318) as described to the (VAG 1318/9) and (VAG 1318/17) (illustration shows 2.0 L engine).
- Open the shut off lever on the (VAG 1318). Lever points in direction of flow - A -.
- Bleed the fuel supply system. Refer to => [ Fuel System, Bleeding ] Description and Operation.
- Reconnect the 4 pin harness connector to the fuel delivery unit.
- Start the engine and let run at idle.
- Measure the fuel pressure.
• Specified value: approximately 4.0 bar
If the specification is not obtained:
- Switch off the ignition.
- Check whether the fuel pump builds up this pressure and can maintain. Refer to => [ Fuel Pump Check Valve, Checking ] Fuel Pump Checking, Engine Code BPR (Metal Fuel Tank).
- Check the fuel pressure regulator. Refer to => [ Fuel Pressure Regulator, Checking ].
If specified value is achieved:
- Switch off the ignition.
- Now check for leaks and residual pressure (entire system). Observe pressure drop on the (VAG 1318). After 10 minutes, at least 3.0 bar positive pressure must remain.
If the residual pressure drops below 3 bar:
- Start the engine and let run at idle.
- Wait until pressure has built up, then switch off the ignition. Shut off lever on the (VAG 1318) must be closed at the same time (lever perpendicular to direction of flow - arrow -).
- Observe pressure drop (engine side) on the (VAG 1318 ).
If pressure drops again:
- Check line connections to the fuel rail and injectors for leaks.
- Check the (VAG 1318) for leaks.
• Before removing the (VAG 1318), place clean cloths around line connection which is to be disconnected.
If the pressure does not drop:
- Check the fuel pump check valve. Refer to => [ Fuel Pump Check Valve, Checking ] Fuel Pump Checking, Engine Code BPR (Metal Fuel Tank).
- Check the fuel pressure regulator. Refer to => [ Fuel Pressure Regulator, Checking ].
Fuel Pressure Regulator, Checking
• Fuel pump check valve OK, checking. Refer to => [ Fuel Pump Check Valve, Checking ] Fuel Pump Checking, Engine Code BPR (Metal Fuel Tank).
• Fuel supply line OK.
CAUTION!
Fuel system is under pressure!
• Wear protective goggles and protective clothing to prevent injuries and contact with skin.
• Before loosening the line connection, place a cloth around the connection point. Then release pressure by carefully loosening the line connection.
- Disconnect the fuel supply line - 3 - and catch the leaking fuel with a clean cloth.
• Press the securing ring to disengage the line.
- Connect the (VAG 1318) with (VAG 1318/23 ) and (VAG 1318/17) to the fuel supply line.
- Close the (VAG 1318) shut off lever (lever stands perpendicular to direction of flow - position - B -).
- Switch the ignition on and off until the fuel pressure on the (VAG 1318) is 4 bar.
- Observe the pressure drop on the (VAG 1318).
• After 30 minutes the pressure must not drop below a 3 bar decrease.
If the pressure drops further:
- Check line connections for leaks.
If no malfunctions are found in connections:
- Replace the fuel pressure regulator.