Chain saw won't start

My Poulan Pro 260 LE chain saw won't start after its warm up so I have to leave the saw on. The primer bulb is empty, no gas, and won't prime regardless how times its pushed - still empty full of air. After a few hours the primer bulb starts to fill up with gas and I could start it again. Any ideas, TIA.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.