Skyhawk L4-121 2.0L Turbo VIN M FI (1987)
Fuel Return Line: Service and Repair
Fuel Tank Unit And Lines (Typical)
WARNING: Always keep a dry chemical (Class B) type fire extinguisher near the work area. A small amount of fuel may be released when
servicing fuel lines or connections. In order to reduce the chance of fire or personal injury, cover the fuel lines or fittings with a shop towel
before disconnecting, to catch any fuel that may leak out. Place the towel in an approved container when the disconnect is complete. Relieve the
fuel system pressure before attempting any repairs. See MAINTENANCE PROCEDURES/FUEL SYSTEM PRESSURE RELIEF.
When replacing fuel feed and return pipes, always replace them with original equipment or parts that meet GM specifications for those parts. The
replacement pipe must have the same type fittings as the original pipes to ensure the integrity of the connection.
NOTE: Do not use copper or aluminum tubing to replace steel tubing. Only tubing meeting the 124M specification or its equivalent is capable of
meeting all pressure and vibration characteristics necessary to ensure the durability standard required.
Many of the feed and return pipes use screw couplings with O-rings. Any time these fittings are loosened to service or to replace components, ensure
that:
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A back-up wrench is used to loosen and tighten fittings.
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Check all O-rings at these locations (if applicable) for cuts or any damage and replace as necessary.
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Use correct torque when tightening these fittings.
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Inspect all pipes for kinks, leaks or dents.
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Pipes must be properly secured to the frame to prevent chafing. A minimum of 6 mm (1/4 inch) clearance must be maintained around a pipe to
prevent contact or chaffing.
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Fuel feed and return pipes are secured to the underbody with clamps and screw assemblies.
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Follow the same routing as the original pipe.
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Fuel pipes must not contact the fuel tank or underbody at any point.
FUEL AND VAPOR PIPE REPAIR:
