fuel pump or relay?

My 1996 jimmy will crank but wont start, I have changed the plugs and the fuel filter and still it wont start, It will start if I pour gas in the carb but wont stay running. How or is there a way to determine if it is the fuel pump or the fuel pump relay, I am not looking forward to changing the pump or the cost, lol, i do not here the pump prime when I turn the key. Thanks
ED

Have you done a search on this board? Here's one to get you started. (Click Here (http://www.automotiveforums.com/vbulletin/showthread.php?t=671263&page=2)) There is a lot of info on fuel pumps and pump relays in previous posts.

Thanks