Drivers side tank doesnt work

[staggerd86c-10]

I currently havent driven my truck in a while but while I have the switch on the passenger side tank the truck runs perfect, as soon as I switch to the drivers side tank the fuel pressure drops and the truck shuts off, so something is wrong. You think it can be something as easy as a kinked fuel line? My selector valve and switch are new and it worked up until I stopped driving the truck, could it have to do with the vent for the gas tank? Thanks ahead of time guys
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