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Home >> Mercury >> 1993 >> Capri Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Fuel Delivery >> Fuel Pressure Regulator
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Fuel Pressure Regulator

  1. Measure fuel pressure. See FUEL PRESSURE in BASIC TESTING article in this section. Stop engine. With fuel pressure tester still installed, measure fuel pressure after 5 minutes. If fuel pressure is greater than 21 psi (1.5 kg/cm2 ) after 5 minutes, go to next step. If fuel pressure does not remain higher than 21 psi (1.5 kg/cm2 ), fuel pressure regulator, fuel pump or fuel injectors may be defective.
  2. Connect vacuum tester to vacuum fitting on fuel pressure regulator and apply 20 in. Hg. Replace fuel pressure regulator if vacuum does not hold. Reinstall fuel pressure regulator.
  3. Start engine and measure fuel pressure. If fuel pressure is higher than specification, check for engine vacuum leaks, damage to fuel pressure regulator housing, or a restricted fuel return line. Replace fuel pressure regulator if no problems are found.
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