Understanding Fuel Line Fittings: Straight Thread (and AN) vs. Tapered Thread

How to Measure National Pipe Threads (NPT) Correctly the First Time - Superior Industrial Supply, Blog

Technical - Prefered fittings-connections for fuel line.

AN vs. NPT Fittings and How They Relate

Fuel Line Sizing - Return vs Feed, Page 2

Fitting Thread Size Chart - Printable

I feel dumbnpt size and hose fittings, someone slap me straight! - The Hull Truth - Boating and Fishing Forum

Understanding Thread Types - Seaboard Marine

Small-Bore Fittings: Thread Size and Pitch

installing a fuel cell Grumpys Performance Garage