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You need a 1/4" NPT threaded hose barb that allows you to connect the hose and yellow (gas rated) teflon tape.

https://www.wholesalemarine.com/tempo...79347.html

https://www.homedepot.com/p/Oatey-1-2.../202078116

Wrap the yellow teflon tape around the threads twice. Insert into tank.

Use stainless clamp on fuel hose. Tighten and then wrap in black electrical tape to keep loose end protected.