My 98 s-10 blazer won't start

What is up with my truck? Less than a month ago it had a had time startin,6:oo am it would start after 5 minutes of tryin then at@:45 when I lave work it wont start at all.I get it set up to have someone tow it, an hour later and it started no prob;em! So I take it in to the shop theyfixed my fuel pump well now it wont start at all again! I hear my pump workin. Anyone have any I deas?

I assume that the starter is working ok when this trouble happens so the engine at least cranks. If that is the case then the next area to check is the ignition. Make sure spark is getting to the plugs.