I've seen many folks with questions regarding the correct routing of fuel lines on machines that use a 3 port primer (purge) bulb. My answer is rather lengthy so if I can help please email me at walthoddinott@yahoo.com. I'm an old hand at small engines. Prior to Covid I had my own small engine repair business. I've got just over 45 years doing this! I will prepare a response with diagrams and photos to get you through this. Thanks all and be safe!