Express 1/2 Ton Van V8-305 5.0L VIN M SFI (1998)
Fuel Return Line: Service and Repair
Fuel Hose and Assemblies
MATERIALS
FUEL LINES
These are welded steel tubes, meeting GM Specifications 124-M, or its equivalent. The fuel feed line is 3/8" diameter and the fuel return line is
5/16" diameter. 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" (100 mm) of any part of the exhaust
system, or within 10" (254 mm) of the catalytic converter. The hose's inside diameter must match the outside diameter of the steel tubing.
CLAMPS
These are stainless steel, screw bank-type clamps, #2494772, or equivalent.
Fuel Hose and Pipes
Diagram
Diagram
REMOVAL PROCEDURE
1. Disconnect the negative battery cable.
2. Relieve the fuel system pressure. Refer to Fuel Pressure Release Procedure.
3. Disconnect the fittings at the engine compartment fuel feed and return pipes.
4. Disconnect the fuel pipe attaching hardware.
5. Disconnect the fuel feed and return pipe nuts at the fuel inlet and fuel outlet assembly.
6. Disconnect the fuel feed and return pipes and O-rings. Discard O-rings.
7. Remove the fuel tank. Refer to Fuel Tank Assembly.
8. Disconnect the fuel feed and vapor hoses.
9. Remove the hardware retaining section of pipe to be replaced.
NOTE: 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:
