CITROEN Saxo 2003 Handbook page 261

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)
Check :
The flow should be drop by drop
Excessive fuel return
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 : diesel injector return flow. (Table)
Uncouple the diesel injector return pipe.
Diesel injector functioning correctly
Diesel injector locked shut.
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XSARA PICASSO
Checks
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 suppy circuit :
- Booster pump (low pressure), piping.
Observe :