If nothing else, sump the tank. The vent MUST be the same diameter or bigger than pump feed line. Some will say it doesn’t matter but it does. Especially with a return line.
Get rid of the filter before the pump. If your tank isn’t full of **** there is zero reason to have a filter before the pump. That’s an issue as well.
Those pumps are picky about pulling fuel. Gravity fed is the best for those pumps but you can’t get that with your pump mounting. So reduce any restriction on the inlet side of the pump.
In fact, the sump should have two outlets in it. Use both of them and run the two lines into a “Y” and then a single line out to the pump.
