Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1992 Mercury Capri Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Fuel Pressure Regulator
- 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. Replace fuel pressure regulator if fuel pressure does not remain higher than 21 psi (1.5 kg/cm2 ).
- Remove fuel pressure regulator. Inspect "O" ring, gasket, and mounting surfaces for defects. Connect vacuum tester to fuel return tube, and apply 20 in. Hg vacuum. Replace fuel pressure regulator if vacuum drops by more than 10 in. Hg in 10 seconds. Reinstall fuel pressure regulator.
- Again measure fuel pressure. If regulated 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.
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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