Fuel pressure issues

[Redchevy87]

I’m having issues with fuel pressure. I have a gauge right before the carb and sometimes it doesn’t even come off of zero when the truck is running and sometimes it jumps around but rarely gets above 2 or 3 psi. Sometimes the truck seems to be running fine and sometimes under load it falls flat on it’s face and feels like it just ran out of fuel. I replaced the pump and the filter with no change. I ran a line from the pump to a gas can to try to rule out it being a bad pump even though it’s new, and I got a rock solid 6.5 psi on the gauge. The only thing I can think of is the sock in the tank could be clogged. Does it sound like I’m on the right track? I just though I would get a couple more opinions before I go through the hassle of dropping the tank, which is of course full.