The picture snippet Phil posted came from this LMC Fuel and Vacuum Lines web page.

That line you mentioned is for 1955.2 and later trucks. At least that's what the parts description indicates for Item #2. A design change to the fuel delivery system.
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Last edited by Gdads51; 02/23/2024 3:50 PM.
~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)