I'm in the process of modifying my oem hanger for a Walbro 525 pump and running a -8AN feed and -6AN return line. I planned all this out and have all the fittings including a 90* bulkhead -8AN fitting for the feed to come out from the hanger. Seen many pics of this and did a lot of research, watched vids, etc. Now that I have it all apart, I'm having a little trouble understanding the theory of this. The outlet of the pump is only 5/16 inside diameter. So how is it that the entire feed line couldn't be 5/16? As far as I know, the rule of flow/restrictions means you can have an indefinite length of any kind of line, be it for fuel, an exhaust system, intake, etc. and the flow will be determined by the smallest restriction or biggest choke point right? So what makes the fuel system flow so well out of such a tiny pump orifice?