257
INJECTION
XSARA PICASSOCHECKS : LOW PRESSURE FUEL SUPPLY CIRCUIT
Engines : RHY - RHZ (continued)
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
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 : diesel injector return flow. (Table)
Uncouple the diesel injector return pipe.
Fuel supply pressure Fuel return pressure Checks
Between 3 and 3.5 Bar 0.7 ± 0.2 Bar Check the condition of the diesel filter
More than 3.5 Bar
More than 3.5 Bar
Less than 0.7 Bar
More than 0.7 Bar
Check the low pressure regulator incorporated in
the filter (locked shut) : replace.
Check the fuel return circuit
(pipe pinched or trapped.......).
Between 0.8 and 1.5 Bar
Less than 0.7 Bar
Check the fuel suppy circuit :
- Booster pump (low pressure), piping.
Check :
Observe :
The flow should be drop by drop
Diesel injector functioning correctly
Excessive fuel return
Diesel injector locked shut.
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