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DESCRIPTION AND OPERATION
Fuel Pressure Regulator
The fuel pressure regulator (9C968) is attached to the fuel supply manifold assembly downstream of the fuel
injectors. It regulates the fuel pressure supplied to the injectors. The regulator is a diaphragm-operated relief
valve in which one side of the diaphragm senses fuel pressure and the other side is subjected to intake
manifold vacuum. The nominal fuel pressure is established by a spring preload applied to the diaphragm.
Balancing one side of the diaphragm with manifold pressure maintains a constant fuel pressure drop across
the injectors. Fuel, in excess of that used by the engine, is bypassed through the regulator and returns to the
fuel tank (9002).
Section 10-01: Fuel Tank, Filters, Lines and
Electric Fuel Pump
1997 Aerostar, Ranger, Equipped with 2.3L, 3.0L, and 4.0L
Gasoline Engines Workshop Manual
Item
Part Number
Description
1
9C968
Fuel Pressure Regulator
2
—
Washer (Part of 9C968)
3
—
O-Ring (Part of 9C968)
4
—
Fuel Return Tube
(Part of 9H307)
Page 1 of 2
1997 Aerostar/Ranger
2011-04-29
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