My boat boat had been underwater for 8 months. I had good access to the fuel sender, which is about a 1 1/2" hole in the top of the tank. I borrowed a inline electric fuel pump, and hooked it up to the normal fuel out let hose. I pumped out 50 gallons of not bad looking fairly clear stuff. I then took a coat hanger, and bent it straight. To the end I tied on as big of piece of soft terry cotton rag as I could get down the hole. I was able to get everywhere in the tank. Then I filled about 10 gallons of gas, and fuel stabilizer. Then I took it for ride behind the truck . I drained this and used it for my riding lawn mower, worked great. Dave-R