98 Suburban Won't Start

I parked the Suburban (5.7 liter) for several months. Tried to start it last week but it would not. Since then, I have put in new gas and a can
of gas treatment/cleaner and start it every day. Now it will run for couple of seconds before it stopped. Sounds like no gas. Any suggestions?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.