Fuel not getting to carburetor

It could be a couple of things, it may be clogged from tank to pump, pump lines are hooked up backwards or the fuel pump is not hitting the cam from lever being installed incorrectly.

No there is a chain going from crankshaft to camshaft. Single arrow points to what should be rubbing on camshaft where the double arrow is I think that is suction if not it is the other side. Put your finger in front of it while turning over and see if it is sucking then see if the hose is sucking together as that may be the problem. It would be wise to put a new fuel filter prior to the pump. If you did not put new hoses on the truck then do so as they are more than likely bad and soft.

Different person,

Maybe there is a hole/ crack in the suction line from the tank, especially in a turn or loop in the line.

Also maybe the sock (in the tank) is stopped up.

I am into crude testing, even if it costs a little bit.

I would get enough rubber fuel line to reach the tank and dangle on the ground to the fuel pump (just to test). You can crawl under and do the proper fix after this works.

Just being me, and kind of ignore the "correct" way, I hook hoses up and suck on them to see if I am pulling fuel (fumes and fuel are involved doing this). I reckon hooking up a hand operated vacuum pump might serve the same purpose.

The Medic