C Yukon 2WD V8-5.7L VIN R (1999)
7. Disconnect the fuel (1) and vapor (4) pipes.
8. Remove the fuel pipe unions in front of the crossmember (2).
9. Remove the hardware retaining section of pipe to be replaced (3). Note location of attaching hardware for installation.
10. Remove the section of pipe and hoses.
11. Remove rust or burrs from the engine compartment fuel pipes by the following procedure:
11.1. Use emery cloth in a radial motion with the fuel pipe end in order to prevent damage to the O-rings sealing surface.
11.2. Using a clean shop towel, wipe off the male tube ends.
11.3. Inspect all the connectors for dirt and burrs. Clean or replace the components/assemblies as required.
INSTALLATION PROCEDURE
1. Connect the fuel feed and return pipes to the engine fuel pipes (1).
NOTE: Refer to Fastener Notice in Cautions and Notices.
2. Connect the fuel pipe attaching hardware (2).
Tighten
Fuel pipe attaching nuts to 27 N.m (20 lb ft) using a back-up wrench.
3. Position new fuel pipe harness in original location and fuel pipe harness attaching hardware (2).
4. Remove protective caps from one end of both fuel pipes. Leave caps on other end of pipes to prevent dirt from entering.
5. Apply a few drops of clean engine oil to the male connector tube ends.
6. Connect the fuel feed pipe to the fuel filter and the return pipe to union (3).
