Operation Section
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3. SUPPLY PUMP
3.1 Outline
z The supply pump consists primarily of the pump body (eccentric cam, ring cam, and plungers), SCV (Suction Control Valve), fuel
temperature sensor, and feed pump.
z The two plungers are positioned vertically on the outer ring cam for compactness.
z The engine drives the supply pump at a ratio of 1:1. The supply pump has a built-in feed pump (trochoid type), and draws the fuel
from the fuel tank, sending it to the plunger chamber.
z The internal camshaft drives the two plungers, and they pressurize the fuel sent to the plunger chamber and send it to the rail. The
quantity of fuel supplied to the rail is controlled by the SCV, using signals from the engine ECU. The SCV is a normally open type
(the intake valve opened during de-energization).
Q001265E
Injector
Rail
Discharge Valve
Regulating Valve
Feed Pump
Intake
Fuel Inlet
Fuel Overflow
Fuel Tank
Camshaft
Intake pressure
Feed pressure
High pressure
Return pressure
Return
Fuel Filter (with Priming Pump)
Filter
Suction Valve
Plunger
Return Spring
SCV
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