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The main 3⁄8-inch-diameter fuel line and 5⁄16-inch-diameter return line run parallel to one another on the ’74 Firebird. Visible is the natural finish on the fuel line and its coiled shield. Note that olive-drab spring clamps are present on the main line, while red clamps are present on the return. The red-oxide primer coat that covers the entire floorpan is clearly visible, too.