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Reply to "fuel line diameter"

Steve is correct but that's really only an issue at Bonneville or maybe the Silver State Open road races where you're at full throttle for many minutes at a time (in any gear). Then the engine may go lean and burn valves.

As I remember, the late fuel gauge sender with external fuel feed is a bolt-on but uses the same (metric size) 5/16" OD fuel line. In the past I welded up a few of these substituting 3/8" OD U.S. steel tubing. You need the old sender parts to do this so don't s-can an inop' one.

When adding the late sender in early cars, the rust-prone welded tank line can be used as a fuel return for EFI systems even if perforated. Or just cap it.

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