Fuel sending unit not flowing.

No I don't think so I was very careful installing it.

It is vented thru the factory filler tube and I have a return line. I actually thought about this and removed the gas cap and return line with the electric pump.

This is probably the case. Looks like I'm dropping the tank lol thanks for the replies guys!
I've applied air pressure going into the tank before and blown off the sock many times. Have you tried that?