Legend Coupe V6-2675cc 2.7L SOHC FI (1988)
Fuel Pressure Regulator: Testing and Inspection
Sedan
Pressure Regulator Test
NOTE: Coolant temperature must be below 221°F and intake air temperature must be below 176°F.
WARNING: Do not smoke during the test. Keep open flames away from your work area.
1. Check the vacuum line for proper connection, cracks, blockage or disconnected hose.
2. Disconnect #1 vacuum hose from the pressure regulator, and connect a vacuum gauge to the hose.
3. Start the engine and allow to idle.
4. Check for vacuum.
There should be vacuum.
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If there is no vacuum, go to pressure regulator cut-off solenoid valve test II.
5. Stop the engine.
6. Restart the engine.
NOTE:
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Engine coolant temperature must be above 105°C (221°F).
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Intake air temperature must be above 80°C (176°F).
7. Check for vacuum.
There should be no vacuum.
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If there is vacuum, go to pressure regulator cutoff solenoid valve test I.
8. Stop the engine.
9. Attach a pressure gauge to the service port of the fuel filter.