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Home >> Mercury >> 1996 >> Villager LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests 3.0L >> Fuel System >> Fuel Delivery >> Fuel Pressure Regulator
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Fuel Pressure Regulator

  1. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE  . Install fuel pressure gauge between fuel filter and fuel rail. Connect fuel pressure gauge in fuel line between fuel filter and fuel rail. Ensure main valve is open and drain valve is closed. Monitor fuel pressure gauge while performing the following:
    • Start engine and operate for 10 seconds.
    • Stop engine and wait for 10 seconds.
    • Start engine and operate for 10 seconds.
  2. Stop engine and remove pressure regulator vacuum hose. Check vacuum port for fuel. If fuel is present, replace fuel pressure regulator and repeat test. If fuel is not present, go to next step.
  3. Connect vacuum pump to fuel pressure regulator vacuum port. Start engine. Apply vacuum to port. If fuel pressure drops when vacuum is applied, fuel pressure regulator is okay and testing is complete. If fuel pressure does not drop when vacuum is applied, replace fuel pressure regulator.
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