Fuel Pressure: Testing and Inspection

CHECKING FUEL AND RESIDUAL PRESSURES




Measuring the line pressure
Connect the pressure gauge

Hint: If the engines starts, do not override the fuel pump (FP). Continue if this is the case, with: "Read off the line pressure from the pressure gauge".

Remove the cover from the integrated relay/fusebox in the engine compartment at the firewall
Remove the fuel pump (FP) relay (103 (terminal 2/23))
Connect a cable (as illustrated on the relay base) between terminals 15 and 87
Turn the ignition key to position II.
Read off the line pressure from the pressure gauge.
The system pressure should be 375 - 395 kPa
Check the residual pressure if the fuel pressure is OK.
Remedy as necessary.

Checking the residual pressure
Switch off the ignition
Disconnect the cable between the terminals on the relay base
Reinstall the fuel pump (FP) relay.
The line pressure must not fall below 200 kPa within 20 minutes of the fuel pump (FP) being shutoff.
Remedy as necessary.