Welcome. You'll definitely get some suggestions here...
Water in carb bowl. Tank plugged with 'stuff'. Tank vent plugged ?Fuel pickup hose in tank is cracked, leaks and otherwise NFG.
Can you run a gravity feed line directly from a fuel supply to the motor ?
Can you back flush the fule line with a shot of compressed air as a temporary fix ?
Can you dribble gas into the air intake to see if it runs continuously or is it not a fuel problem ?
If the fuel filter is clear plastic, can you see fuel in it ?