K Yukon/Denali 4WD V8-6.5L DSL Turbo VIN S (1999)
Fuel Supply Line: Service and Repair
Fuel Hose/Pipes Assembly Replacement
Materials
Fuel Lines - These are welded steel tubes, meeting GM Specifications 124-M, or its equivalent. Do not use copper or aluminum tubing to replace steel
tubing. Those materials do not have satisfactory durability to withstand normal vehicle vibration.
Coupled hose - These are not to be repaired and are replaced only as an assembly.
Uncoupled Hose - Use only reinforced furl resistant hose, made of Fluoroelastomer material. Do not use a hose within 4 inches (100 mm) of any part of
the exhaust system, or within 10 inches (254 mm) of the catalytic convener. The hose inside diameter must match the outside diameter of the steel
tubing.
Clamps - These are stainless steel, screw bank-type clamps, #2494772, or equivalent.
Fuel Pipe Repair
1. Cut a piece of fuel hose 4 inches (100 mm) longer than the section of pipe to be removed. If more than 6 inches (152 mm) is to be removed, use a
combination of steel pipe and hose. The hose length should not be more than 10 inches total.
2. Cut a section of the pipe to be replaced with a tube cutter. Use the first step of a double flaring tool to form a bead on the ends of the pipe and,
also, on the new section of pipe, if used.
3. Slide the hose clamps onto the pipe and push the hose 2 inches (51 mm) onto each portion of the fuel pipe. Tighten a clamp on each side of the
repair.
4. Secure the fuel line to the frame.
