135
FUEL SYSTEM
COMPONENTS
7
COMPONENTS
The fuel syste m includes the following compo-
nents:
• Fuel Lift Pump
• Fuel Filter
• Vapor Separator
• Fuel Circulation Pump
• Fuel Supply Manifolds
• Fuel Injectors
• Fuel Return Manifolds
Fuel Lift Pump
The fuel lift pump is a mechanical, pressure-pulse
pump. T he diaphrag m of t he pump is driven b y
two pu lse hoses that connect to the cylin-
der/crankcase assembly.
Fuel lift pump pulse hose locations:
• Front mounted pump: cylinders 3 and 6
• Side mounted pump: cylinders 2 and 5
Vacuum from the fuel lif t pump pulls fuel from the
fuel t ank. Once fuel reaches the pump, internal
pump pressure forces the fuel from the pump
through the fuel filter and into the vapor separator.
Fuel Filter
The fuel filter protects the vapor separator and the
high-pressure components of the fuel system from
contaminants. Refer to INSPECTION AND MAIN-
TENANCE SCHED ULE on p. 16 for service fre-
quency.
Vapor Separator
The vapor separator:
• Serves as a water-cooled fuel reservoir to accu-
mulate incoming fuel from the fuel lift pump and
from the fuel return manifold
• Contains a flo at con trolling the venting of fue l
vapors
• Contains a fue l pressu re regulator for t he hig h
pressure fuel system.
The va por separator is serviced as an assembly
and includes the fuel circulation pump.
1. Front mounted pump
2. Side mounted pump
006989
1. Filter 005022
Vapor Separator Assembly
1. Circulation pump
004186
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