Honda Acura NSX 1991 Service Manual page 271

Description
The fuel pressure regulator maintains a constant fuel
pressure to the injectors. When the difference between
the fuel pressure and manifold pressure exceeds 3.5
kg/cm* (50 psi), the diaphragm is pushed upward, and
the excess fuel is fed back into the fuel tank through the
return line.
CLOSE
INTAKE MANIFOLD
VACUUM
OPEN
INTAKE MANIFOLD
VACUUM
Testing
open flames away from your work area.
1 . Attach a pressure gauge to the service port of the
fuel filter (page 1 l-88).
Pressure should be:
323-363 kpa (3.30-3.70 kg/cm*,
(with the regulator vacuum hose disconnected)
PRESSURE
REGULATOR
F U E L
INLET
2. Reconnect the vacuum hose to the pressure
regulator.
DIAPHRAGM
46-53 psi)
FUEL PRESSURE GAUGE
I
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