New Holland SmartTrax T8.320 Service Manual page 57

Common Rail
1) Common rail
2) Fuel return
The volume of the common rail is relative small to allow quick pressure build up at cranking and start up, at idle, and
in case of high flow rates.
The rail has enough volume to minimize pressure spikes caused by the opening and closing of the injectors and the
operation of the high pressure pump.
The fuel pressure sensor (5) sends a signal to the ECU; this is feedback information in the calculation of the PWM
signal sent to the regulator valve.
The relief valve (6) open at 1850 - 1950 bar (29825 - 28275 psi)
Engine - Engine and crankcase
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3) Connector to injectors
4) Fuel supply
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5) Fuel pressure sensor
6) Relief valve