General Motors — Engine Controls -8.1L 6-239

A General Motors service procedure — check it applies to your exact model before use.

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Procedure

1. Turn the ignition OFF.
2. Disconnect the negative battery cable in order to avoid possible fuel discharge if an accidental attempt is made to start the engine.
3. Remove the fuel injector sight shield. OS Dy cg Sh &%) \ mefi4335 OES 665445 MEF! 4 6-232 Engine Controls - 8.1L Engine Connect the J 34730-1A fuel pressure gauge to the fuel pressure valve. Wrap a shop towel around the fitting while connecting the gauge in order to avoid spillage. Install the bleed hose of the gauge into an approved container.
4. Open the valve on the gauge to bleed the system pressure. The fuel connections are now safe for servicing.
5. Drain any fuel remaining in the gauge into an approved container. Quick Connect Fitting(s) Service (Metal Collar) Tools Required J 37088-A Tool Set, Fuel Line Quick-Connect Separator J 44581 Fuel Line Quick Connect Separator Removal Procedure
6. Relieve the fuel system pressure before servicing any fuel system connection. Refer to Fuel Pressure Relief Procedure, MEFI 4 180378 Vy Lg 200m) == 12776 12780
7. Remove the retainer from the quick-connect fitting. Caution: Wear safety glasses in order to avoid eye damage.
8. Blow dirt out of the fittig using compressed air.
9. Choose the correct tool from the tool set for the size of the fitting. insert the tool into the female connector, then push inward in order to release the locking tabs. Engine Engine Controls-8.1L 6-233
10. Pull the connection apart.

Source: manual:8.1L-MEFI-4-Service-Manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.