Some, not all have a shut-off at the bottom of each tank. the right side tank on mine is visible standing from the back. I think there is one on each side of mine 2002.
This fall my XW2300 Dixie Chopper 23hp Honda give it up. My dealer got me this within 24 hours from the factory, 2 days later I was back to work. 36hp Briggs Vanguard big block. Amazing re-power.
hlw49 is correct. I have seen many triangle plates seeming working but freely but not swinging far enough to stop the blades from turning. pull the triangle plate completely clean and grease and re assemble.