I recently purchased a 1977 Silverton 28 Convertible that was stored in the water over the winter. when I bought it 1 tank had about 5 gals. and the other about 70 both tanks hold 75 gals. each. for the 1st weekend out I put about 19 gals in the empty tank and topped off the other one. I ran for about 3hrs and the one that was empty for the winter. When that tank was empty I switched tanks a few mins later the engine died. Had to be towed back in luckily I wasn't far from the marina I had a worker tow me w/ the yard boat. Well I get back in and found that was water in the tank so I siphoned the tank from the pickup until no more water came out (just gas). Then I started the engine and let it run for a good 1/2 hr. Ran great so I went out for another ride. As soon as I trimed out the motor died again (2nd tow of the day) I got the boat back in and decided to give up for the day. I went back today and ran the motor again for about 45mins. Started up 1st try but after shutting down the engine I siphoned out some more gas and water was still in the lines. I don't know how the engine was running w/ so much water (the fuel from the lines was white) anyway I was wondering if I empty out the tank from the pickup and then fill up w/ fresh gas and some "dry Gas" if it would possible solve my problem.