It worked for me. (The language is not for kids, but, this guy had an idea. This works. It's one of many videos.
(14) No more vapor lock 62 impala - YouTube He made some newbie mistakes, but u get the idea. Here's the tube protection I used.
(18) how to make a fuel vapor return line chevelle GM - YouTube I never needed to slit the plastic. Just buy the right parts that match. ) I used a softer, 100% (real) copper 20' 1/4" tube and ran parallel to my tank to pump feed steel line. First, I sleeved it in plastic piping/tubing with ID matching my new return line OD - lathered it up with Vasoline and kept at it. U can cut the plastic tubing in sections if it works better for you. With the plastic outside, no slitting required, it made handling and forming the turns way easier as I fed it from front to back. Zipped tied to the older line and ran it right up to the filler pipe. Took out the filler pipe and did nice, safe job on the barbed nipple (brass) 1/4" with screw/nut super tight(washer) by holding with long needle nose, the nut/washer inside the pipe as I turned the brass nipple. For extra seal, I used brass washers and I still added a bit of RTV, but, it's low pressure, and it has not leaked. Take the filler out. The key is getting the right three nipple filter. I used a WIX 33041 or '40 ? Uncle Tony likes 1/16" or thereabouts I forgot. Mine has the third nipple orthogonal to the filter axis. I know I'm writing this late - for the next guy. Good luck