Vapor return or liquid return line?
You don't need to go to that work for an orifice. Wix (and others) make several different configurations of inline fuel filters with a 1/4" return already built in. Once again, do not connect that to the vapor line unless you provide a vent elsewhere. That IS the vent for the tank in your system
Wix 33040 for 5/16 tube and 1/4" return, 33041 for 3/8 tube and 1/4 return
https://www.oreillyauto.com/detail/...rator/6bf814fc80d2/wix-fuel-filter/wix0/33040
You don't need to go to that work for an orifice. Wix (and others) make several different configurations of inline fuel filters with a 1/4" return already built in. Once again, do not connect that to the vapor line unless you provide a vent elsewhere. That IS the vent for the tank in your system
Wix 33040 for 5/16 tube and 1/4" return, 33041 for 3/8 tube and 1/4 return
https://www.oreillyauto.com/detail/...rator/6bf814fc80d2/wix-fuel-filter/wix0/33040