I've been looking for this style filter for a while. My 3/8 sending unit has a 2nd fitting that I can run the return line to. Can I use it as a return?
Parts stores should have these in stock or easily get them. If they don't stock or deal with Wix they can interchange that number. There are at least three different ones. 33040 is 5/16, 33041 is 3/8, both with 1/4" return fitting with an orifice. There's a third I don't have the part no. On those the return comes out the side of the filter.
I would say "yes" you could use the sender port, you'll have to run a second tube. I would run either 5/16 or 3/8 tube in case you upgrade the system / HP later.