Very good , although. Consider using dummy tube or rod in third hole/port in rubber bung. If you know how thin the membrane you punch through on other two tubes you would do it. Brass rod or use short tube with crimped and soldered end. Also the bung security/tightness at the infilled hole is compromising. I noticed nothing else was compromised…well done ✅

All fuel tanks need some maitainence, granted. Don't use these opaque tanks, see the vid from DA on fuel tank set up, my comments. You should know their inherent short comings.