CITROEN XANTIA User Manual page 155

XANTIA - SYNERGIE
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.
CHECKS : LOW PRESSURE FUEL SUPPLY CIRCUIT
Engines : RHZ - RHY (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 below)
Uncouple the diesel injector return pipe.
Diesel injector functioning correctly.
Diesel injector locked shut.
148
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 :