1994 Mercury Capri Base, StandardFACTORY OEM SERVICE PROCEDURE

Fuel Pressure Regulator

  1. Measure fuel pressure. See FUEL PRESSURE in BASIC TESTING article in the ENGINE PERFORMANCE 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. Measure fuel pressure. If fuel pressure is higher than specification, inspect for engine vacuum leaks, damage to fuel pressure regulator housing, or a restricted fuel return line. Replace fuel pressure regulator if no problems exist.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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