Get shopping advice from experts friends and the community my craftsman 4 cycle leaf blower model 41as4esg799 leaking oil from a black hose that has a check valve which is connected corburater air filter housing which soak the air filter it only happend when the engine is start please let me know how to fix it thanks. Sears 4 cycle leafblower leaks oil golden education world book document id 3342d3f4 golden education world book sears 4 cycle leafblower leaks oil description of sears 4 cycle leafblower leaks oil aug 20 2020 by dan brown read sears 4 cycle leafblower leaks oil get shopping advice. My 4 cycle leaf blower will not start and it leaks oil answered by a verified technician we use cookies to give you the best possible experience on our website by continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. If the leaf blower smokes a lot check the fuel mixture too much 2 cycle oil in the gasoline mixture causes excessive smoke most 2 cycle leaf blower engines use a 401 or 501 gasoline to oil mixture a dirty air filter can cause the engine in a leaf blower to smoke excessively clean or replace the air filter if its dirty