Engine dies at 4000 approx rpm. After several trips with no problems engine will run 20miles out . on return trip engine cut off 6 times after 15 miles. Never has quit on trip out only on trip back. Problem occurs after boat is run several miles and sometimes will go 3 or 4 trips about 40 miles with no problems. When it does cut off it will restart by squeezing bulb and opening throttle and usually will occur more than once on return trip. Added 45 gal of fuel last trip out ,ran 20 miles great, started in after 15 miles it quit. Have changed spin on filter and have run about 200 gal of fuel through it. It did sit for 90 days in the spring but started in a couple of seconds. Help