Make sure your fuel vents are unclogged

Yesterday I was traveling east on I64 in WV and as I started climbing hill my truck shut off and I coasted onto shoulder.
I've cracked it but no start. Checked all fluids all good. Water separator was full. Started apu to keep inside cool and it shut off after couple minutes.
Checked fuel tanks and passenger one was completely dry and drivers had 1/2 full. Culprit was vent clogged up and on my truck '13 KW T660 it has system where it equalizes fuel in both tanks so thst fuel is fed equally. However if vent is plugged it won't draw from that tank.

 

Valve responsible to make sure fuel is equal in both tanks?

 

That's what mechanic said problem was. However it won't work properly if vent is clogged up. After unclogging that hose I've been checking and fuel is equal in both tanks

 

This truck does have crossover but I'm sure if vent is plugged it won't equalize fuel level in both tanks. I've been checking both tanks like 10 times already cause I'm paranoid and they look same