289
INJECTION
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 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 Less than 0.7 bar
Check the low pressure regulator incorporated
in the filter
(locked shut)
: replace.
More than 3.5 bar More than 0.7 bar
Check the fuel return circuit
(pipe pinched or trapped…)
Between 0.8 and 1.5 bar Less than 0.7 bar
Check the fuel supply circuit:
- Booster pump
(low pressure)
, piping
Impossible to start the engine: Check: diesel injector return flow
(table below).
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).
Uncouple the diesel injector return pipe.
Check: Observe:
The flow should be drop by drop Diesel injector functioning correctly
Excessive fuel return Diesel injector locked shut
Engines: RHY - RHZ (continued)
XSARA PICASSO
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