Ford Transit 2002 Owner's Manual page 865

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Under normal demand conditions, fuel is delivered to the high-pressure fuel pump chamber
unrestricted where it is compressed and delivered to the fuel rail.
A small proportion of fuel is diverted through the calibrated fuel pump fuel return bore. This
returned fuel is used to lubricate and cool the high-pressure pump. As the fuel exits
through the fuel return line venturi, the accelerated flow across the injector return line
orifice creates a partial vacuum in the fuel injector return line. This partial vacuum assists
with the scavenging of fuel injector fuel return fuel.
Description
Low pressure fuel control valve
Calibrated fuel pump fuel return bore
High-pressure pump low pressure fuel inlet channel
Fuel injector fuel return
Fuel pump to fuel filter fuel return
High-pressure fuel pump fuel outlet channel
Fuel feed to fuel transfer pump
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