I want to replace my fuel hoses with some of the transparent Tygon type style. With the regular black auto parts store stuff I use 5/16 with a clamp, but it does fit a little loose. If I am using no clamp with the Tygon stuff, should I go down to maybe 1/4 ID? Thanks.

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1993 300d - Von Strudel
1987 190e (RIP) - Duke
1983 230e (sold) - Helga
1982 240d (sold) - Igor
1973 280 (sold and missed )