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Home >> Dodge and Ram >> 1998 >> Durango 5.9 Z, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - 5.9L >> Fuel System >> Fuel Pressure Release >> Vehicles With Fuel Rail Test Port
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Vehicles With Fuel Rail Test Port

  1. Loosen fuel tank filler cap. Ensure ignition is off. Remove protective cap from fuel rail test port.
  2. Place one end of Fuel Pressure Release Hose (C-4799-1) into an approved fuel container. Attach remaining end of hose to fuel rail test port. Use care, as fuel system may be under pressure. Fuel pressure will be released from fuel system. Remove hose, reinstall protective cap, and fuel tank filler cap.
  3. Wait 5 seconds. Use care when disconnecting fuel lines, as some fuel pressure may still exist in fuel lines.
NOTE: One or more DTCs may set when fuel pump relay is removed. Clear DTCs from PCM after fuel pressure release procedure. To clear DTCs from PCM, see CLEARING DTCS under SELF-DIAGNOSTIC SYSTEM in TESTS W/CODES - 5.9L article.
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