Ford Corsar Repair Manual page 171

FUEL FLOW SYSTEM DESCRIPTION
I
CAZOE
(
Fuel tank
Fuel pump and damper
A EF-003
(3 Bar, 43.5 psi)
d
The amount of fuel to be injected is determined by the injection pulse
duration as well as by a pressure difference between fuel pressure
and intake manifold vacuum pressure. The E.C.M. controls only the
injection. pulse duration. For this reason, the pressure difference
between the fuel pressure and intake manifiold vacuum pressure
should be maintained at a constant level. Since the intake manifold
vacuum pressure varies with engine operating conditions, a press-
ure regulator is placed in the fuel line to regulate the fuel pressure in
response to changes in the intake manifold vacuum pressure.