Did you change your fuel filter when you did the pump?

Think you should take it to shop, that deals with Hummer H3, and have it checked.

You need to get it hooked to a diagnostic computer, most auto parts stores will let you use their computer for free if you leave them your driver's license. Like dollybird said you should probably just take it to a dealer.

Did you check to see if the plugs are firing? Next time you have any question about the function of a fuel pump, just lightly spray a little ether (starting fluid) beyond where the air filter goes. If it starts up and runs for a short time, that will let you know there's a problem with your fuel pump or fuel system.

Lucky person you are !!!!! Thats a fine machine indeed . I have a foolish question for you ,if you can afford a fine machine like that what the heck are you doing under the hood? My advise is take it to the dealer and and use there courtesy car to go play golf and have a meal and pick the hummer up later . Are you just teasing us with your fine car , I take the bus or walk and only see these fine machines from the bus bench LOL !!!!!!! God Bless and may your good fortune and prosperity continue .                                    Bill

Check the following: Fuel relay, fuel fuse, fuel regulator, fuel pressure. Should be 60 PSI to 150 PSI, depending on vehicle specs. Before doing any of the above make certain you have a spark at the spark plug. Owners manual will show were the electricals are.

Note: Since you have replaced the pump you should bleed the air out of the fuel rail. ( It looks like a tire valve stem). This can prevent an engine from starting.