Why wont my truck start?

What is your question?

It is a 2001 chevy 1500.(not a 99 it wouldnt let me choose 2001). It started off by not starting after sitting a day or so, but would start right up if it had recently been ran. And randomly started at times. I replaced the fuel pump and it worked for 2 days and is now not starting but cranking. Even when i give it some gas which would work in the past along with letting the key turn over for about 15 seconds 3 times. Any help is appreciated

How long has your 1999 Chevrolet C1500 had this problem?

A few weeks