3/8 and 10mm (9(9.5?)mm inner) nylon fuel line is almos the same. your choice. i simply used overcounter napa parts. 5/16 just snags better. this is not fuel, this is fuel vapor and very thin (50 psi fuel injection? c'mon, we are talking vacuum here). i doubt it has any hazzard or it will detoriorate rapidly. it is mostly fresh air. sure thing "metric" is better but with clamps it's no different imho
Last edited by ftp19601960; 06-16-2016 at 11:59 AM.
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