Ford Transit 2002 Owner's Manual page 871

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When the fuel injection process has reached the desired injection duration, the solenoid
valve is de-energised.
The injection control valve spring closes the injection control valve and the fuel pressure in
the injector needle upper chamber rises to equal the pressure of the injector needle lower
chamber. As the pressures equalize, the injector needle spring closes the injector needle so
preventing fuel injection.
To prevent a sudden increase in the pressure in the injector needle lower chamber as the
injector needle closes, the fuel entering the chamber is restricted by the injector needle
lower chamber fuel inlet choke.
Fuel injector fuel return
The fuel injector fuel return is required to make the fuel injectors function.
The amount of return fuel developed during the normal functioning of a fuel injector
indicates the condition of that injector. By measurement and comparison of fuel injector
fuel return quantities, diagnosis of the fuel injectors is possible.
Inspection and Verification
WARNINGS:
Do not smoke or carry lighted tobacco of any type when working on or near any fuel
related components. Highly flammable mixtures are always present and may ignite.
Failure to follow these instructions may result in personal injury.
This procedure involves fuel handling. Be prepared for fuel spillage at all times.
Description
Solenoid valve
Injection control valve
Injector needle upper chamber
Injector needle control spring
Injector needle
Injector needle lower chamber
High-pressure fuel feed
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