What fittings do I need for fuel lines

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No, you don't need a fitting between stainless and hose. If you expand the end of the stainless the hose won't slip off when clamped. This is how factory installation is done.

Some example shapes:






I like to make a partial flare using the bubble flare tool as it seems to give the best shape. But you can get an acceptable bubble using 45 degree inverted flare mandrels.