All the welded bungs I used are NPT fittings. I used brass tube adapter fittings that screw into these weld fittings to couple the fuel lines to the tank. I could substitute NPT to AN fittings (adaptor fittings) if I went with AN hose, but I didn't go that route. I did use JB weld "fuel resistant" epoxy to cement the internal 1/2" line together and also where the 1/2" line meets the weld bung inside the tank. This set up has been in use for several years now with absolutely no issues.
The only other issue I was having was finding an electric pump that would survive long distance driving, 4-5 hours continuous driving. I smoked 2 pumps. Called several different manufacturers for recommendations on a pump and all but one said they will not live for continuous use. Weldon has 2 pumps that they said would work, but decided to run a Clay Smith mechanical pump, problem solved.
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