I have an old 6hp Tecumpseh engine on a Sears Shredder that I am trying to salvage for a brush cutter. It will start if you spray fuel in the carb, then dies. I've cleaned the carb and checked all jets. I've checked the carb and intake bolts for tightness. Once started, you can sometimes keep it running for a little while by blocking the air intake (creating a super-choked condition). Can't seem to find why the carb won't suck fuel into the intake throat.