recently purchased a 90 K75RT that had sat, not run for some 3 years. it "cranked" over with great "vigor" but would not start. it was NOT prepared for long term storage. fuel has gone bad. when I pumped it out, I sucked up a lot of black sediment, didn't appear to be rust. I'm open to suggestion, I suspect I need to clean the injectors, what about the tank? add some gas, slosh it around and pump/pour it out till clean or send it off where? thanks in advance for suggestions/