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Fuel Pressure Regulator Pressure Leakage

  1. Ensure ignition is off. Relieve fuel pressure. See FUEL SYSTEM in BASIC TESTING article in the ENGINE PERFORMANCE section. Remove fuel pressure regulator. Check "O" ring, gasket and mounting surfaces for cracks, cuts and other damage.
  2. Connect vacuum pump to fuel return tube, and apply 20 in. Hg vacuum. See Figure . If maximum vacuum loss exceeds 10 in. Hg in 10 seconds, replace fuel pressure regulator. If maximum vacuum loss does not exceed 10 in. Hg in 10 seconds, fuel pressure regulator is functioning properly.
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