fuel delivery problem

right above tank on the support

uphill ?

got a gas can handy?

why not disconnect the pump from the pickup, and run a short hose into a gascan, to see if the pump is willing to draw out of that?
infact, disconnect the outlet of the pump and run a hose back into the gascan, to rule out the pump

once we know the pump works, pick one of the lines to hook it up again and see if it works now
eliminate one part of the path at once

speaking of which, did we eliminate all the soft line ?
checked all the clamps?

(one of our members, i forgot his name, always says IF you must use wormscrew hose clamps put two of them one, 180 degrees lapsed so that you gt a good seal)
any place you can suck in air the pump will take the easy way out and suck air instead of fuel