My how to is on the website here.
https://packardinfo.com/xoops/html/modules/article/view.article.php?c8/114 The units I've seen (mostly 51-6) have the ground through the mounting bracket via a thin strip of bronze that connects to the bottom of resistor and the case. A rivet passes through end of resistor, insulator, bronze strip and case. It goes up to where the contact mounts on swing arm & shares that connection. If you don't have that solid ground connection, with worn bushings I can see how that would cause the problem.
As to the fitting, not sure what your car has. Mine appears to be a standard 5/16 inverted flare fitting on the tube end that screws into the tank fitting. The tank fitting is a little different than a 51-6 but again looks like standard 5/16 to 1/8 pipe. Without pulling it all apart, won't swear to that but nothing appears to be brazed and no hose.
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