K 2500 Suburban 4WD V8-454 7.4L VIN N TBI (1995)
Evaporative Fuel Vapor Return Hose: Service and Repair
Repair EVAP pipe in sections using brazed seamless steel tubing meeting GM Specification 123M or its equivalent or hose identified with the words
"Fluoroelastomer." Hose not so marked could cause failure or failure to meet emission standard.
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Do not use copper or aluminum tubing to replace steel tubing. Those materials do not have satisfactory durability to withstand normal vehicle
vibrations.
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Do not use rubber hose within 100 mm (4") of any part of the exhaust system or within 250 mm (10") of the catalytic converter. The replacement
hose's inside diameter must match the steel tubing outside diameter.
1. In repairable areas, cut a piece of fuel hose 100 mm (4") longer than the portion of the line being removed.
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When more than a 130 mm (6") length of pipe is removed, use a combination of steel tubing and hose so that the entire hose length will not be
more than 250 mm (10").
2. Cut ends of the pipe remaining on vehicle square by using a tube cutter. By using the first step of a double flaring tool, form a bead on the ends of
both pipe sections. If pipe is too corroded to withstand bead operation without damage, the pipe should be replaced. If a new section of pipe is
used, form a bead on both ends.
3. Use screw type hose clamp GM part number 2494772 or equivalent. Slide clamps onto pipe and push hose 50 mm (2") onto each portion of fuel
pipe. Tighten clamps on each side of repair.
