https://www.amazon.com/gp/product/B0002JMCQ4/ref=oh_aui_detailpage_o01_s01?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B000E35WHO/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
https://shop.advanceautoparts.com/p/dorman-help-nylon-fuel-line-union-5-16-inch-nylon-lines-800-012/9110017-P?searchTerm=nylon+fuel+line
This is what I bought- quick connectors go to rail, steel union is going on tank side, with a peice of rubber line in between sending unit nipple and union. Either gonna use two more quick connects for the filter, or two more steel union-rubber line. Havent done anything yet, but I will post some pics when I do. I used nylon line on another truck that I got from gastankman on ebay. Came out super nice, he sold a kit for the chevy, but not the comanche. The ends are pretty hard to push on. But I found a link a couple days ago that shows using a caulk gun and flaring block to put the barbed fittings into the nylon line. You put the line in the flaring block, place the flaring block across the bottom of the gun, and press the fitting into the line like that. This is what I'm gonna try, but dorman also sells a tool which looks nice.