I'm thinking of hooking up a return line on my '56 Chevy to help with vapor lock/hot start issues before the Texas summer hits hard (it's running a mechanical fuel pump). I'm going to try a 1/2" phenolic spacer first and insulate/reroute the fuel lines to see how that works -- the carb/fuel line is getting too hot after a long run and the fuel line can be routed better. It's a problem that's already rearing its ugly head. I searched this board and the Wix 33041 filter was recommended. I need it to have an orifice. Apparently Wix 33041 is unobtanium from every supplier I've found -- bummer as I prefer Wix products. Is there another part # someone can provide that functions the same as the Wix 33041? I'd like to tackle this problem soon.