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Fuel Pump Volume Test

  1. Perform FUEL PRESSURE TEST  . If fuel pressure is okay, relieve fuel system pressure. See FUEL PRESSURE RELEASE  . Ensure area around fuel supply line and fuel rail are clean. Note direction of latch clip installation. Latch clip is located on top of fuel supply line at fuel rail. Using 2 screwdrivers, pry latch clip upward, and remove from fuel rail.
  2. Pull fuel supply line from fuel rail. Install appropriate adapter into fuel rail. See FUEL RAIL ADAPTER APPLICATION table below. Ensure adapter is fully seated in fuel rail. Install adapter latch clip into fuel rail, with latch clip fingers pointing downward. If latch clip will not fully seat so latch clip fingers extend downward below fitting on fuel rail, adapter may not be fully seated in fuel rail.
    FUEL RAIL ADAPTER APPLICATION

    Application Adapter No.
    4.0L 6541
  3. Connect fuel supply line to adapter. Ensure fuel supply line fully seats in adapter. Insert other end of adapter into a graduated container suitable for gasoline. Connect scan tool to data link connector. Using scan tool, actuate fuel pump. Volume of fuel should be one pint (.47L) in 30 seconds. If fuel volume is not as specified, check for a plugged fuel filter, kinked fuel line or fuel pump tank module.
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