Measuring Fuel Pressure

MEASURING FUEL PRESSURE

Operations:

- Start engine.

- Read off fuel pressure while stationary as described in the Service Manual: Section 2(23,28) LH3.2MFI/EZ-129K DI Engine Management Systems, 850 1992- (refer to the appropriate manual for the fuel and ignition system on the car)

- Drive car and read off fuel pressure while the car is being driven.

The fuel pressure should be:

210-310 kPa for naturally aspirated engines

210-380 kPa for Turbo engines

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.

DISCONNECTING FUEL PRESSURE GAUGE

Operations:




- Connect the evacuation unit hose to the hose nipple on the door mirror (see black arrow in illustration).

- Start the evacuation unit so that there is suction in the hose.

Operations:




- 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.

Disconnecting evacuation unit

Operations:




- Remove adapter hose from the engine.

- Wait a few minutes in order for the hose to empty.

- Turn off the evacuation unit.

- Remove the measurement equipment and hoses from the car.




- Reinstall the protective cap on the engine fuel manifold.

- Reinstall the cover over the throttle pulley.