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Home >> Jeep >> 1996 >> Grand Cherokee Limited, 5.2 Y >> Repair and Diagnosis >> External Pages >> Different car >> Section 180 (Engine Controls - Tests W/Codes - 4.0L) >> Self-Diagnostic Tests >> Test NTC-3B - Checking Fuel Pressure

Test NTC-3B - Checking Fuel Pressure

WARNING: This page is about a different car, the 1995 Jeep Wrangler, 1995 Jeep Grand Cherokee, and 1995 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE  procedure in this article.
NOTE: Perform TEST NTC-1A  before proceeding with this test. For connector terminal identification, see CONNECTOR IDENTIFICATION  at beginning of article. For wiring diagrams, see WIRING DIAGRAMS  at the end of this article. Perform TEST VER-2A  after each repair.
  1. Using scan tool, stop fuel system actuation. Inspect fuel lines for kinked or restricted lines. Repair fuel lines as necessary. On ZJ body, if no kinked or restricted lines exist, replace fuel pump and sock assembly located inside fuel tank. On XJ or YJ bodies, if no kinked or restricted lines exist, go to next step.
  2. On XJ or YJ bodies, ensure fuel tank is at least 1/4 full before proceeding. Release fuel pressure. Install fuel pressure gauge and adapter between fuel tank and fuel filter. Remove fuel return line from fuel pump at fuel tank. Connect Fuel Pressure Test Adapter (6541) to fuel return line. Place other end of adapter hose into an approved 2-gallon gasoline can.
  3. Turn ignition on. Using scan tool, actuate fuel system. Observe fuel pressure gauge. If fuel pressure is not 34-44 psi (2.3-3.1 kg/cm2 ), go to next step. If fuel pressure is 34-44 psi (2.3-3.1 kg/cm2 ), repair fuel return line for a restriction at fuel tank.
  4. Using scan tool, stop fuel system actuation. Relieve fuel pressure. See FUEL PRESSURE RELEASE  procedure in this article. Reconnect fuel return line to fuel tank. Disconnect fuel return line from fuel rail. Attach Fuel Pressure Test Adapter (6541) to fuel return line at fuel rail. Place other end of adapter hose into an approved 2-gallon gasoline can.
  5. Turn ignition on. Using scan tool, actuate fuel system. Observe fuel pressure gauge. If fuel pressure is 34-44 psi (2.3-3.1 kg/cm2 ), repair restricted fuel return line to fuel tank. If fuel pressure is not 34-44 psi (2.3-3.1 kg/cm2 ), replace fuel pressure regulator located at fuel rail.
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