01 ENGINE
14
High Pressure Fuel Rail
The fuel rail supplies fuel to the injectors. The fuel rail pressure sensor supplies
pressure information to the PCM. A pressure relief valve inside the low pressure
return line allows pressure over 1885 psi to return to the low pressure side of the
high pressure fuel pump.
High Pressure Pump Internal Construction
A trochoid drive on the camshaft at the rear of the cylinder head drives the high
pressure pump. When the PCM energizes the spill control solenoid fuel enters
the pump chamber. When the spill solenoid is commanded off, the high pressure
chamber is isolated and can build high pressure. The one way check valve assures
high pressure can only go one direction, into the rail.
Low pressure
fuel return to
pump (internal
pressure relief)
In from high
pressure pump
Fuel rail
Fuel pressure
sensor
Plunger
Pulsation
damper
Spill control
solenoid
High
pressure
to rail
Low
pressure
from tank
One-way
check valve
Pump chamber
Trochoid pump
drive
Valve