That's a whole story. I ordered one from AutoZone, and when I pulled it out of the box, the ports don't match the semi-hard lines. I took the Ford one and the AutoZone one back, and we spent probably 25 minutes trying to find a correct one. I'm pretty sure it's a dorman. It's supposed to be here tomorrow.
I seriously thought about a single 38 gal tank, but I have my spare under the rear, and didn't want to deal with a spare being constantly in the way, so I decided to just keep the dual tanks. Regarding the switching valve, I think something got in it, and caused it to partly block fuel delivery. I have an electric fuel pump, and I can fill the system, but it runs out of fuel in about a minute, so it flows, but not enough. My plan is new senders, shower heads, switching valve, blow out the lines, and new filters in both the pump, and on the engine. When I redid the truck, this is about the only thing mechanically that I didn't redo, so I figure it deserves it.