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**Captainfab** · 11-04-2011, 11:50 PM

Automotive hardline for plumbing fuel and brakes, is measured on the OD. So 3/8" hardline is 3/8" on the outside. The next step up would be 1/2".

11-04-2011, 11:50 PM	#5
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,254	Re: fuel line size Automotive hardline for plumbing fuel and brakes, is measured on the OD. So 3/8" hardline is 3/8" on the outside. The next step up would be 1/2". __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE