LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mercury >> 1992 >> Capri Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Fuel Delivery >> Fuel Pressure Regulator
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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. Replace fuel pressure regulator if fuel pressure does not remain higher than 21 psi (1.5 kg/cm2 ).
  2. 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.
  3. 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.
scientia non olet · About LEMON Manuals