Sounds like something is obstructing flow through the pump. If you have fuel at the filter then it is inside the pump. Fass is a flow through design. I’ve had a fuse pop on me and I was still able to drive the truck without the lift pump running.
Or like mentioned before it could need to be primed. Make sure you have a gasket on the suction filter. Follow the instructions for priming. Take off the hose to see if you have any discharge at the pump