FLD120 With 1/4 Fuel left,truck dies..??

2000 FLD120 here... Been idling the truck as I do some light maintenance on it at home. Went to start it yesterday, ran for a few seconds and died. Fuel gauge shows 1/4 left in the tanks. Passenger side is empty, drivers side is about 1/4 of the way full, and both fuel shut-off's are open, so I'd think it would automatically pull from the drivers side. Plugged vents or lines? Would appreciate some feedback. Thanks!

 

I understand priming and everything else, I guess I just couldn't understand what would be causing it to stall when the driver's side tank has plenty of fuel. I guess the fuel tanks aren't equalizing, more or less. I've seen plenty of threads about that happening, mostly for Pete's. I'm sure most of the fixes go across the board..?

 

Gotcha, thanks for the explanation. It's an N14 so I'll prime the pump and filter to see if it'll pull.

 

So I filled the fuel filter and put 5 gallons in the passenger side tank. Got to looking around on the drivers side and pulled up the vent hose. I found this to be the culprit for the tanks not leveling out:

Fuel Plug by smctransferllc posted Apr 2, 2018 at 7:19 PM

Now why would anyone want to plug it up like that?? The hose was brittle and snapped off of the vent anyway. Good thing I bought 100ft of 1/4" today. I ended up taking the vent out and cleaning it. Pressed the ignition button and it fired right up. I'll check the level tomorrow to see whether or not the tanks equalized.