My wife recently ran our 70 johnson out of gas while on the water. It worked ok 1full tank later but now wants to stall at higher rpm's. Replaced the fuel line and primer bulb from tank but no help. Cleaned fuel filter also no help. Whats odd is when it starts to die my buddy would pump the primer bulb a few times and it takes right off up to wot but only for a few minutes then begins to stall again. Just had impeller replaced so I dont believe it's running hot? IS this possibly the fuel pump? Also I think the vro has been disabled but not sure. Always mix gas in tank at fil up. Any ideas??? Sorry so long!