Century V6-3100 3.1L VIN M SFI (1998)
Fuel Supply Line: Service and Repair
Fuel Hose / Pipes Replacement (Filter to Tank)
Removal Procedure
Caution: In order to Reduce the Risk of Fire and Personal Injury:
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If nylon fuel pipes are nicked, scratched or damaged during installation, Do Not attempt to repair the sections of the nylon fuel pipes.
Replace them.
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When installing new fuel pipes, Do Not hammer directly on the fuel harness body clips as it may damage the nylon pipes resulting in a
possible fuel leak.
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Always cover nylon vapor pipes with a wet towel before using a torch near them. Also, never expose the vehicle to temperatures
higher than 115°C (239°F) for more than one hour or more than 90°C (194°F) for any extended period.
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Before connecting fuel pipe fittings, always apply a few drops of clean engine oil to the male pipe ends. This will ensure proper
reconnection and prevent a possible fuel leak. (During normal operation, the O-rings located in the female connector will swell and
may prevent proper reconnection if not lubricated.)
Notice: Do not attempt to straighten the kinked nylon fuel lines. Replace any kinked nylon fuel feed or return pipes in order to prevent damage to the
vehicle.
Notice: Replace the EVAP pipes and hoses with the original equipment or parts that meet the GM specifications for those parts. The replacement EVAP
pipe must have the same type of fittings as the original pipe in order to ensure the integrity of the connection. When replacing EVAP hoses, use only
reinforced fuel-resistant hose identified with the word Fluoroelastomer or GM 6163-M on the hose. The inside hose diameter must match the outside
pipe diameter. Do not use rubber hose within 100 mm (4 in) of any part of the exhaust system or within 254 mm (10 in) of the catalytic converter.
Notice: Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering the open pipes
and passages.
Important: Always maintain cleanliness when servicing fuel system components.
1. Relieve the fuel system fuel pressure. Refer to Quick Connect Fitting(s) Service (Metal Collar).
2. Drain the fuel tank. Refer to Fuel Tank Draining Procedure.
3. Remove the fuel tank. Refer to Fuel Tank Replacement.
4. Remove the fuel feed, fuel return, and EVAP pipe quick-connect fittings at the fuel sender assembly. Refer to Quick Connect Fitting(s) Service
(Metal Collar).
5. Cap the fuel sender fuel pipes and the in-pipe fuel filter pipes as needed to stop any fuel leakage.
6. Remove the fuel feed, fuel return, and EVAP pipe attaching hardware.
7. Remove the fuel feed, fuel return, and EVAP pipes.
8. Note the position of the fuel, and EVAP pipes and the fuel and EVAP pipe attaching hardware for installation.
Installation Procedure
Caution: In order to Reduce the Risk of Fire and Personal In jury: If nylon fuel pipes are nicked, scratched or damaged during installation,
they must be replaced.
Notice: Always re-attach the fuel lines and fuel filter with all original type fasteners and hardware. Do not repair sections of fuel pipes.
