Ford Transit 2002 Owner's Manual page 862

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Fuel is drawn from the fuel tank through the fuel filter by means of a transfer pump. The
transfer pump is built into the high-pressure pump and driven by the high-pressure pump
input shaft.
Fuel from the transfer pump is passed through the high-pressure pump low pressure fuel
inlet channel into the high-pressure fuel pump chamber.
In the high-pressure pump low pressure fuel inlet channel is situated a fuel metering valve.
The fuel metering valve is controlled by the PCM. A fuel pressure sensor input signal is used
by the PCM to calculate the position required by the fuel metering valve to achieve the
desired fuel rail pressure. The fuel metering valve reduces the cross sectional area of the
high-pressure pump low pressure fuel inlet channel and so decreases the quantity of fuel
allowed to reach the high-pressure fuel pump chamber.
Located in the rear of the fuel pump is a fuel temperature sensor which monitors the fuel
transfer pump fuel delivery temperature. The sensor information is used by the PCM to
adjust the fuel metering valve to compensate for cold fuel charge values.
If the fuel temperature sensor or its related circuits become shorted to ground, the engine
will shut down and not restart.
If the fuel temperature sensor or its related circuits become open circuit, the engine
management system will default to a value of 39°C and cold start characteristics will be
impaired.
Description
Input shaft
Transfer pump
High-pressure fuel pump cam ring
High-pressure pump low pressure fuel inlet channel
Fuel temperature sensor
Fuel return line venturi
Fuel metering valve
High-pressure fuel outlet union
High-pressure fuel pump fuel outlet channel
High-pressure fuel pump chamber
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