It's on a snowblower, Tecumseh HM80 155296, serial 5323D, # on carb 1099 L54. Carb was rebuilt last year and I really don't want to remove it, gas leaks out when not running but stops when I close the tap below the tank. Other wise runs good. I just replaced the needle valve and seat as on instructions and nothing in the float, I adjusted the float with drill bit method but to no avail it still leaks, everything looks clean no signs of varnish. So I'm thinking if I used a product like Seafoam in the gas tank do you think it might clear up what happening. Otherwise I think I'll just use the fuel shutoff valve when not in use. Anything else simple I can do before I put the cover back on?