All right, is there any good 5/16 fuel line anywhere now?

Actually, the last NAPA filter I put on had GREAT squeeze-style clamps, better than any I've ever put on before. They had a good bit of tension, and were actually tough to keep open with plain pliers, they did not deform or stay spread after getting them over the "hump". I also added a donut-style trans magnet to trap rust fines on the inlet side.

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