Fuel Supply and Return Reversed? Options

[s13u74cr4]

I believe the PO of my 914 reversed the supply and return on the fuel lines when he swapped in SS lines. From reading other posts and diagrams the larger should be the supply I think. Believe this is backwards?
Zip tie is me trying to figure out what’s happening and get a decent photo and failing.

[r_towle]

Supply comes from the largest fitting on the bottom of the tank.
That fitting has a screen inside to prevent large rust and dirt from getting sucked into the engine fuel supply

From underneath, you can see it is the larger diameter tube.
From there it should go to a fuel filter…up from in a 75/76 car, or in the rear for earlier cars.

Filter is before the fuel pump to protect the pump.