1993 Ford Ranger backfiring and hesitating on acceleration

Hi , I was just wondering?.... I am not sure why my truck has decided to act funny, but i changed my plugs in it and it ran fine for awhile, a little hiccups, but not too bad. Now it has got to the point where it is like coughing and lightly making lound popping noies [ Like soft backfireing] I have noticed that i when i turn the key on i do not here the lound noise of the fuel pump kicking in so maby it is going, i relly need help!!!!!!
Thanks,Mike Ps. the above millage is KMS.