Won't stay runnin

[Southern.Chevymudbug]

I gotta 97 Chevy c1500 and I just put a brand new battery, altnator, starter, an fuel pump and did a tune up oil change, plugs n wires ect... I went to drive it an the new battery was dead, so I jumped it off and drove it down the road ran great! Next day battery dead so jumped it off and it fired right up it ran for about 20 minutes and just die. That's all it keeps doin so I feel like something is grounding out somewhere because of the battery always dying, but I seen that my fuel regulator vacuum line has piece missing like someone took a pocket knife and skint a chunk out of it. I don't think that's my problem although it would be I think if my battery wasn't draining. 

[Mikebtte]

Sounds like a possible battery issue. Would check your connections. If the alternator is keeping it running than that is clearly not the issue. I used to disconnect the battery while it was running. If it kept running the alternator was good, if it died the alternator was failed. Hard to do that on more modern vehicles.

I would take the battery in for a test