DESCRIPTION AND OPERATION
Page 63
High-Pressure Fuel System
The high-pressure fuel system (Figure 71) is
designed to provide fuel to the combustion
chamber under high pressure. In this system, unit
pumps (one per cylinder) with operating
pressures of 26,000 psi are used for this purpose.
These high pressures, along with an extended
timing range and optimized timing control,
provide excellent performance.
Fuel is supplied to each of the unit pumps by the
fuel supply gallery in the cylinder block. The high
pressure required for fuel injection is generated
by a pump plunger (10 mm diameter, 18 mm
stroke), which is actuated by a roller cam follower
(tappet) driven by the engine camshaft. The
volume of fuel delivered to each cylinder is
precisely metered by a solenoid mounted on
each of the unit pumps, which responds to
signals from the V-MAC III EECU. The
pressurized fuel is delivered to the injector
nozzles by individual external fuel injector lines.
71
Figure 71 — High-Pressure Fuel System
5-111.bk Page 63 Monday, July 10, 2006 2:26 PM
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