Checking The Fuel Pressure While Driving
Checking the fuel pressure while driving
Special tools:
981 2270 PUMP TROLLEY 981 2270 Pump Trolley
981 2273 PUMP 981 2273 Pump
981 2282 Tank 981 2282 Tank
998 9725 Adapter 998 9725 Adapter
999 5011 MANOMETER 999 5011 Manometer
951 2614 hose 951 2614 Hose
Overview
The fuel pressure and residual pressure can usually be checked in the workshop. If required, there is a description of the method for checking the fuel pressure and residual pressure while driving.
- Checking the fuel pressure and residual pressure in the workshop.
- Checking the fuel pressure while driving, see Connecting the pressure gauge.
Connecting the pressure gauge
- Use pressure gauge 999 5011 MANOMETER 999 5011 Manometer with nipple 998 9725 Adapter 998 9725 Adapter and adapter 951 2614 hose 951 2614 Hose before use.
- Remove the cover over the fuel rail.
- Connect the adapter to the valve on the fuel rail. Set the adapter in its locked position. (illustration 1, valve closed)
- Turn the tap on the pressure gauge in the direction of the hose 951 2614 hose 951 2614 Hose.
- Connect the other pressure gauge terminal to the fuel draining unit 981 2270 PUMP TROLLEY 981 2270 Pump Trolley , 981 2273 PUMP 981 2273 Pump , 981 2282 Tank 981 2282 Tank.
- Open the adapter (illustration 2, valve open).
Routing the pressure hose
Note! Ensure that the hose follows the rubber trim on the plenum chamber. Ensure that it is then routed out of the engine compartment at the rear corner of the bonnet. The adapter hose joint at the T-valve must be outside the engine compartment. This is to ensure that neither the bonnet or the hose are damaged when the bonnet is closed.
Connecting the fuel pressure gauge
- Secure the T-valve on the left door mirror. Use tape.
Note! Protect the valve and the connector with foam rubber as illustrated.
- Turn the T-valve cock to the middle position (position 2 in the illustration).
- Start the draining unit.
Connecting the fuel pressure gauge, continued
- Turn the T valve cock toward the engine (position 1 in illustration)
- Stop the draining unit.
- Remove the draining unit hose from the T-valve hose connector.
- Lock the cock with a tie strap. The cock must be pointing towards the engine.
- Arrange the hose along the rubber trim on the plenum chamber cover to the left of the bonnet hinge. This is to prevent damage to both the bonnet and the hose.
- Carefully close the hood.
Checking the fuel pressure while the car is being driven
- Start the engine.
- Drive the car. Read off the fuel pressure while the car is being driven. The fuel pressure must be: 220 - 310 kPain all driving conditions.
Removing the fuel pressure gauge
- Connect the draining unit hose to the hose nipple on the door mirror (the black arrow in the illustration).
- Start the draining unit.
- Remove the tie strap locking the cock on the T-nipple.
- Set the cock in the central position. (position 2)
- Close the valve. (position 1)
- Disconnect adapter. Open the valve.
- Reinstall the protective cap.
- Remove the test equipment and hoses from the car.
- Reinstall the cover over the fuel rail.