Fuel Pump Diaphragm
Definitely sounds like your Fuel Pump Diaphragm needs replaced. Over time the diaphragms get brittle and don't expand like they should. This is a do-it-yourself project which takes about an hour tops to do less if you've done them before.
Mine was doing the same last year so I replaced mine and it was the problem for sure. Don't go out and buy the pump because you probably don't need a new one, just get a diaphragm kit from your local marina.
Good Luck, I know it will work!!!
Crouch & Hengstler Team Vicious, Southern Pro, Crappie Pro