LaCrosse 2006-2007

Relieving Fuel System Pressure

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3.6L Engine



  1. Before servicing the vehicle, refer to the Precautions Section.
    CAUTION
    Remove the fuel tank cap and relieve the fuel system pressure before servicing the fuel system in order to reduce the risk of personal injury. After you relieve the fuel system pressure, a small amount of fuel may be released when servicing the fuel lines, the fuel injection pump, or the connections. In order to reduce the risk of personal injury, cover the fuel system components with a shop towel before disconnection. This will catch any fuel that may leak out. Place the towel in an approved container when the disconnection is complete.

  2.  
  3. Turn the ignition OFF.
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  5. Remove the fuel pump fuse and the fuel pump relay.
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  7. Loosen the fuel filler cap to relieve the fuel tank vapor pressure.
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  9. Attempt to start the engine and allow the engine to run until it stops.
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  11. Remove the fuel pressure test port cap.
    CAUTION
    Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete.

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  13. Wrap a shop towel around the fuel pressure test port and use a small flat-bladed tool in order to depress (open) the fuel pressure test port valve.
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  15. Place the shop towel in an approved container.
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  17. Install the fuel pressure test port cap.
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  19. Tighten the fuel filler cap.
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3.8L Engine



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable to avoid possible fuel discharge if an accidental attempt is made to start the engine.
  4.  
  5. Remove the fuel tank cap to relieve tank pressure. Do not tighten until the service procedure has been completed.
  6.  
  7. Connect a fuel pressure gauge with bleed valve to the fuel pressure test port. Wrap a shop towel around the fitting while connecting the gauge to catch any spilled fuel.
  8.  
  9. Install the bleed hose into an approved container and open the valve to bleed off the fuel system pressure.
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  11. Drain any fuel remaining in the gauge into an approved container.
    CAUTION
    There may still be residual fuel in the system, and a small amount of fuel may be released when servicing fuel lines or connections. In order to reduce the chance of personal injury, cover the fuel line fittings with a shop towel before disconnecting to catch any fuel that may leak out.

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