Fuel only from right tank

I've replaced the vents on the top of the tanks, my caps don't have vents built in to them

 

I actually did change those lines, they were caked with mud, i almost didnt even notice them! But thanks though. I've shifted towards other stuff on the truck like the bunk heater, can't seem to get it to put out hot air even though the first line in the heater core can burn me. I'm waiting on parts to put on the rest of the valves but right now I can drive it but adjusting the return line valve, my hope is to get it just right to where it is equal. And so then I won't have to install a crossover line.

 

So I got all the valves on, and i turned the right tank off and only let it pull from the left. My fuel filter vac gauge jumped to about 6 instead of the normal 2.5 or lower at idle. Looks like I have some restriction somewhere between the left tank and The T splitter, ive already blown the lines out and flushed the tank completely, i just purchased a crossover hose today but now that I know it's not the return but the suction, I may try to figure out what it is. Not having a equalizer hose underneath would make me not worry as much and also would make me just, in general, a happy person haha

 

Well, i found the problem, I pulled the lines off again, blew them out and it seemed to blow through okay, I took the fitting off at the T fitting where the 2 tanks come together and I shined a light in the hose and could see it was plugged up with rubber. Took it out and I guess the workers who installed the hoses for me put the wrong fitting on one side, the fitting wasn't even made for this size of hose. Makes me mad that they did that, this taught me to never assume a shop does everything right haha, thanks yall