was driving down the road and sidekick quit running and wont start

Three things make an internal combustion engine run. FUEL-SPARK(ignition)-AIR(compression). When you're missing one of theses it will not run. Changing a fuel pump with not knowing it was a lack of fuel is money spent unwisely. Not really enough info to help. How many miles? Do you have spark? Do you have fuel? Have you coded out the PCM?