Briggs & Stratton Vanguard 430000, User Manual

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10
Fuel Pump
An electric fuel pump (Figure 6) transfers fuel in the
EFI system. Depending on the application, the
pump may be inside the fuel tank, or in the fuel line
near the tank. Through a relay, the ECU activates
the fuel pump to pressurize the system. The fuel
pump remains on while the engine is running.
Figure 6
Fuel Filter
EFI engines use a high volume, high-pressure, in-
line fuel filter (Figure 7).
Figure 7
Fuel Rail
The fuel rail (Figure 8) is a formed tube assembly
that feeds fuel to the top of the injectors. A valve in
the rail allows for testing the operating pressure or
relieving fuel system pressure when servicing.
When the rail is assembled to the manifold, formed
cups in the rail lock the injectors into place. A small
retaining clip provides a secondary lock.
Figure 8
Fuel Injectors
The fuel injector (Figure 9) is an electromagnetic
device that opens when voltage is delivered from
the ECU. The longer the voltage is applied, the
longer the injector will stay open. The injector
sprays a fine mist of highly atomized fuel at the
back of the intake valve through the intake port.
Figure 9