Taking Fuel Pressure Readings While Driving the Car

Taking fuel pressure readings while driving the car

Special tools:
999 5011 MANOMETER 999 5011 Manometer
951 2614 hose 951 2614 Hose
981 2270 PUMP TROLLEY 981 2270 Pump Trolley
981 2273 PUMP 981 2273 Pump
981 2282 Tank 981 2282 Tank

Installing test equipment





Corrective actions:
- Assemble fuel pressure gauge 999 5011 MANOMETER 999 5011 Manometer and new adapter hose 951 2614 .
- Use foam wrapping around the fuel pressure gauge and all metal joints to avoid scratching the interior of the car or damaging the exterior paint work.

Connecting fuel pressure gauge





Corrective actions:
- Remove protective cap from the fuel pressure line nipple.
- Install the adapter hose nipple loosely on the nipple on the fuel pressure line. The nipple will be tightened later.
- Arrange hose as illustrated.

Caution! Ensure that the hose follows the rubber trim on the plenum chamber and then out of the engine compartment at the rear corner of the hood, with the adapter hose joint at the T-valve outside the engine room, so that neither the bonnet or the hose are damaged when the hood is closed. In addition check that hose cannot contact the throttle control reel.




- Install the T-valve to the left door mirror using tape. NOTE! Protect the door mirror and wing edge with foam protection as shown in the illustration.

Connecting fuel draining unit




The unit must be operating when the measuring equipment's hose is connected to the engine in order to reduce the risk of fuel spillage.

Corrective actions:
- Connect the fuel drainage unit hose to the T-valve on the door mirror (pos. 3 in illustration).
- Turn the T-valve cock to the middle position (position 2 in the illustration).
- Start the evacuation unit to get suction in the measurement unit hose to the engine.





Corrective actions:
- Tighten nipple on fuel rail.

Caution! Note! Check that there is no fuel leakage and that the evacuation unit is operating while the nipple is connected to the engine.




- Turn the T-valve cock so that it is pointing toward the engine (position 1 in the illustration) to shut off the suction from the evacuation equipment.




- Use a tie strap to lock the cock in the position toward the engine.




- Remove the draining unit hose from the T-valve hose connector.
- Turn off the evacuation unit when the hose is empty.
- Arrange the measuring equipment hose along the rubber list on plenum chamber cover at the left bonnet hinge in such a position that the hose and bonnet are not damaged.
- Carefully close the hood.

Measuring fuel pressure





Corrective actions:
- Start the engine.
- Drive the car and read off fuel pressure while the car is being driven. The fuel pressure should be: 375-395 kPa (54.4 - 57.3 psi) .

Caution! Note! At constant engine loads the fuel pressure should be stable. At acceleration or during engine braking the fuel pressure may vary between the maximum and minimum readings.

Removing fuel pressure gauge





Corrective actions:
- Connect the evacuation unit hose to the hose nipple on the door mirror (see black arrow in illustration).
- Start the evacuation unit so there is suction in the hose.





Corrective actions:
- Remove the tie strap locking the cock on the T-nipple.
- Turn the cock to the middle position (position 2) to obtain suction in the hose to the nipple in the fuel manifold on the engine.

Removing fuel draining unit





Corrective actions:
- Remove adapter hose from the engine.
- Wait a minute or so for the hose to empty.
- Turn off the draining unit.
- Remove the measurement equipment and hoses from the car.




- Reinstall the protective cap on the fuel rail.