2000 Saturn SLFACTORY OEM SERVICE PROCEDURE

4 - Fuel Pump Flow/Pressure Test

TOOLS REQUIRED 

  • SA9127E-7 Fuel Flow/Pressure Test Adapter

For this test, the vehicle will be raised on the hoist and a means of controlling the fuel pump from under the vehicle is required. The Scan tool readily provides this function. Refer to ENERGIZING THE FUEL PUMP .

NOTE: Battery must be at a minimum of 12 volts when performing any fuel system test. Charge battery before proceeding if below 12 volts.
  1. Connect Scan tool to vehicle and turn Ignition to On.
  2. Relieve fuel system pressure. Refer to RELIEVING FUEL PRESSURE .
    Fig 1: Relieving Fuel System Pressure
    G01068182Courtesy of GENERAL MOTORS CORP.
  3. Raise vehicle to comfortable working position.
    CAUTION: WHENEVER FUEL LINE FITTINGS ARE LOOSENED OR REMOVED, WRAP A SHOP CLOTH AROUND THE FITTING AND HAVE AN APPROVED CONTAINER AVAILABLE TO COLLECT ANY FUEL.
  4. Disconnect fuel feed (5/16 in.) and fuel return (3/8 in.) lines at fuel filter/pressure regulator.
    NOTE: To properly utilize the fuel flow/pressure test adapter, it must always be connected with the fuel feed line on the "INLET" side of the adapter and the fuel return or drain line connected to the side with the flow control (ON/OFF) valve. If not connected properly, a "zero" pressure reading will always be read. Use the appropriately sized connector fittings to hookup the adapter to the feed and return lines.
  5. Connect Fuel Flow/Pressure Test Adapter SA9127E-7 to (1) feed and (2) return lines and make sure connections are firmly latched.
    Fig 2: Fuel Flow/Pressure Test Adapter (SA9127E-7)
    G01068183Courtesy of GENERAL MOTORS CORP.
  6. Connect fuel pressure gauge to test adapter.
  7. Turn ON/OFF valve on test adapter to On.
  8. Energize fuel pump for a minimum of 10 seconds.
    1. Record the fuel pressure, while pump is energized
    2. Repeat this procedure a minimum of two times.
  9. Using the SCAN tool, determine the battery voltage (with the pump OFF) and record.
  10. Compare pressure and voltage recorded to published specification.
    Fig 3: Fuel Pressure Under Flow At Fuel Rail Table
    G01068184Courtesy of GENERAL MOTORS CORP.
  11. Refer to FUEL SYSTEM DIAGNOSIS - FUEL SUPPLY CHART  in this manual and use test result to make appropriate decision.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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