Fuel circuit pressure checks

FUEL CIRCUIT PRESSURE CHECKS

Checking fuel regulation pressure

Disconnect the pipe coming from the filter (shown by the arrow) from the injector fuel manifold. Place pressure gauge 1895890000 and two taps (1) and (2) between the end of the disconnected pipe and the fuel manifold, as illustrated in the diagram.

Supply the electric pump with the engine switched off through the "active diagnosis" function of the F/L Tester.
Alternatively, proceed as follows:
- extract the pump relay from the socket
- make a connection as shown in the diagram using a suitable bridge for this purpose.
The pressure reading on the gauge should stabilize, in these conditions, at 3.0 bar ± 0.2 bar.
If the pressure is too low, carry out the next test.

Checking maximum fuel supply pressure (or efficiency of electric pump)

Keeping the same connections as for the previous test, close the tap (2) located downstream of the pressure gauge, operate the electric pump with the engine switched off, as described for the previous test: the pressure should reach 5 bar and not exceed 7 bar (pump safety valve setting). If this is not the case, replace the electric pump because it is defective.