Whats the fuel lines at the tank after the selector valve?

I know the supply is 3/8.

Not sure what the return size is?

I'm gonna bypass my valve and see if my truck works like it should.

My guess is some pieces of the shower head are logged in it causing fuel starvation at higher rpms.

But first i need to test with a jerry can and this will help with that too. I figure it will drain the tank pretty fast unless i send the return to the jerry can too.

 

5/16 on the return line.