CITROEN 2005 C4-XSARA-XSARA PICASSO BERLINGO Owner's Manual page 295

CHECKS: LOW PRESSURE FUEL SUPPLY CIRCUIT
Checks on pressure: dynamic.
Engine running, at idle (normal functioning) :
- Fuel supply pressure shown by the pressure gauge [3] = 2 ± 0.4 bar.
- Fuel return pressure shown by the pressure gauge [3] = 0.7 ± 0.4 bar.
Abnormal functioning
Fuel supply pressure
Between 3 and 3.5 bar
More than 3.5 bar
More than 3.5 bar
Between 0.8 and 1.5 bar
Impossible to start the engine:
Fuel supply pressure less than 0.8 bar:
- Check the low pressure regulator incorporated in the filter (locked open).
- Check the high pressure pump distribution valve (locked shut).
The flow should be drop by drop
Engines: RHY - RHZ (continued)
Fuel return pressure
0.7 ± 0.2 bar
Less than 0.7 bar
More than 0.7 bar
Less than 0.7 bar
Check:
Excessive fuel return
Check the condition of the diesel filter
Check the low pressure regulator incorporated
in the filter (locked shut) : replace.
Check the fuel return circuit
(pipe pinched or trapped...)
Check the fuel supply circuit:
- Booster pump (low pressure) , piping
Check: diesel injector return flow (table below).
Uncouple the diesel injector return pipe.
Observe:
Diesel injector functioning correctly
Diesel injector locked shut
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XSARA PICASSO
Checks