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Home >> Jeep >> 1987 >> Comanche Base, 2.1 B >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - TBI >> Adjustments >> Fuel Pressure Regulator Adjustment
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Fuel Pressure Regulator Adjustment

  1. Replacement fuel pressure regulator must be adjusted to establish correct pressure. Remove air filter elbow and hose. Connect tachometer leads to diagnostic connector D1, attaching negative lead to terminal D1-3 and positive lead to terminal D1-3. Remove screw plug and install fuel pressure test fitting.
    NOTE: Fuel pressure test fitting is not included with throttle body. Fitting (Part No. 8983 501 572) must be obtained separately.
  2. Connect fuel pressure gauge to test fitting. Start engine and accelerate to speed of approximately 2000 RPM. Turn Torx head screw at bottom of regulator to set correct pressure. Turning screw inward increases pressure and turning screw outward decreases pressure.
  3. All models require fuel pressure of 14.5 psi (1.0 kg/cm2 ). Install lead sealing ball to cover regulator adjustment screw after adjusting fuel pressure. Turn ignition off. Remove measuring equipment and test fitting. Install original plug screw and air filter assembly.
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