LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 2000 >> Cherokee Limited, 2D Pickup >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures >> Fuel Systems >> Fuel System Pressure Leak-Down Test >> Cherokee & Wrangler
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Cherokee & Wrangler

  1. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE . Ensure area around fuel supply line and fuel rail are clean. Disconnect fuel supply line from fuel rail.
  2. Install Fuel Line Pressure Test Adapter Hose (6539 for 5/16" fuel lines or 6631 for 3/8" fuel lines) between disconnected fuel line and fuel rail. Connect 0-60 psi (0-4.2 kg/cm2 ) fuel pressure test gauge from Gauge Set (5069) to test port on adapter hose.
  3. Ensure no fuel leaks exist and start engine. Warm engine to normal operating temperature. Fuel pressure should be 44.2-54.2 psi (3.1-3.7 kg/cm2 ). Turn ignition off. Pressure should not fall to less than 30 psi (2.1 kg/cm2 ) for 5 minutes.
  4. If pressure falls to less than 30 psi (2.1 kg/cm2 ), start engine and warm to normal operating temperature. Turn ignition off. Clamp rubber hose between fuel rail and test port on adapter hose. If pressure still does not hold, repair leaking fuel injector or fuel rail. If pressure holds at 30 psi (2.1 kg/cm2 ) or more, go to next step.
  5. Remove clamp from hose. Start engine and allow to reach operating temperature. Turn ignition off. Clamp hose between fuel supply line and adapter test port. If pressure does not drop to less than 30 psi (2.1 kg/cm2 ) for 5 minutes, check and repair leaking fuel lines or connections. If lines and connections are okay, check valve in fuel pump or fuel pressure regulator is defective. Replace fuel pressure regulator and or fuel pump module. See FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article.
scientia non olet · About LEMON Manuals