Pressure Regulator

Description
The fuel pressure regulator maintains a constant fuel pressure to the injectors. When the difference between the fuel pressure and manifold pressure exceeds 3.0 kg/cm2 (43 psi), the diaphragm is pushed upward, and the excess fuel is fed back into the fuel tank through the return line.
Testing

AWARNING Do not smoke during the test. Keep open flames away from your work area.

1 . Attach a pressure gauge to the service port of the fuel filter (page 11-105).

Pressure should be:
280-330 kPa (2.8-3.3 kg/cm2, 40-47 psi) (with the regulator vacuum hose disconnected)

2. Reconnect the vacuum hose to the pressure regulator.

3. Check that the fuel pressure rises when the vacuum hose from the regulator is disconnected again.

If the fuel pressure did not rise, replace the pressure regulator.