请帮我啃诊断一下snowblow的问题

I have a 3-year old Toro snow blower. I didn't drain the gas after last use, and it won't start now. I thought the carburetor must be clogged up. While I tried to drain the gas by loosening a bolt under the carburetor as instructed by the manual, the gas won't even drain. only a small amount of dirty gas flew out. Half tank gas won't flow out. is this another evidence the carburetor is gummped up? please help me to diagnose it. I thought the spark plug should be fine given it is only 3-year old. 

所有跟帖： 

• 你自己已经知道答案了 -biglow- ♂ (227 bytes) () 11/23/2017 postreply 11:06:27

• 有时连丙酮都溶不开。而且拆开也不好清洗掉，硬在管壁上的最麻烦 -润涛阎- ♂ (167 bytes) () 11/23/2017 postreply 17:31:27

• 丙酮和甲醇在实验室都是用来从溶剂里沉淀大分子的，拿来洗是雪上加霜。 -68245- ♀ (0 bytes) () 11/24/2017 postreply 04:15:56

• 有道理 -biglow- ♂ (259 bytes) () 11/24/2017 postreply 14:35:05

• 也许是化油器的浮漂卡住了呢 -kanata- ♂ (0 bytes) () 11/23/2017 postreply 11:34:01

• 同意。如果那里没有汽油, 95%是浮標阀粘/卡住了。想必没有忘记开油路阀。 -PrimeryColor- ♀ (0 bytes) () 11/23/2017 postreply 12:25:02

• 多谢回复 -kingy- ♂ (285 bytes) () 11/23/2017 postreply 12:59:33

• 我可以断定你住寒冷地方。carb里面形成无数汽油冻（透明软块，走哪堵哪），只有1个办法：拆+洗 -味苦- ♂ (0 bytes) () 11/23/2017 postreply 23:27:47