New Holland SmartTrax T8.320 Service Manual page 51

Pressure control mode
RAIL15TR00370AA
(A) Supply fuel drawn from pre-filter
(B) Supply fuel to final filter
(1) Fuel supply relief valve 5.0 bar (72.5 psi)
(2) Supply pump bypass valve (for bleeding)
Bypass mode
RAIL15TR00370AA
(A) Supply fuel drawn from pre-filter
(B) Supply fuel to final filter
(1) Fuel supply relief valve 5.0 bar (72.5 psi)
(2) Supply pump bypass valve (for bleeding)
Engine - Engine and crankcase
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When the fuel Pressure exceeds 5.0 bar (72.5 psi), the
supply pump relief valve open opens and fuel is routed
to the inlet side of the pump.
During lift pump operation, fuel will bypass the gear
pump through a check valve that opens at about 0.138
- 0.345 bar (2.0 - 5.0 psi).