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Mercruiser 57 Liter 1989 Malibu

I have a 5.7 liter Mercruiser

I have a 5.7 liter Mercruiser the boat has had a problem with running out of gas in the filter bowl when warm. I went over board with making excuses for higher horsepower by installing a weilan intake and Edelbrock carb. I also installed a new high output Holley Fuel Pump. It ran better than ever however still the same thing looses gas in the filter when it heats up thus stopping the engine. I replaced the water fuel seperater I am starting to think I am sucking air somewhere or vent issues. Any ideas this is getting very costly.
 
Plugged fuel vent? Defective p

Plugged fuel vent? Defective pick-up tube in fuel tank? A fuel hose that is not tight? A loose fitting in your fuel separator?
 
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