[TEET]

Are you getting spark? Did you ever drain the tank completely and flush all the junk out of it? Is there fuel in the bowl now? I cant see how putting the side panel on could somehow cause this, but I guess you never know....is the fuel line pinched or something? Trial and error unfortunately, but I would check for spark first since is the easiest to get to, and go from there re-tracing your steps
Jeff (teet)