Not getting fuel. HELP!!!

[4x4K10]

Ok so today i finally got my truck registered and insured and what not after getting it running right and road worthy. It's an 85 k10 with a 305. For the past couple weeks since i got it running and adjusted the carb correctly it started and idled perfectly in my driveway. It would never bog down or stall. We rebuilt the carb about two months ago. Its the original quadrajet that came on it. So today we took it for the first drive since owning it but had some problems along the way. We drove about 5 miles to the gas station to fill up, it ran pretty good, no sign of failure. After filling up we took off just driving around town when about a mile or two later the truck starts fluttering and stalls out. We cranked it and cranked it and finally got it to fire up just for it to do the same thing again a couple feet down the road. We ended up getting a family member to tow us home which luckily isn't to far. So what my question is, why does it do this? and what are the possible reasons for this? Its got a new fuel pump. While driving it just does not seem like its getting any gas and it just flutters and dies. This is one of the most annoying things ever! All help is appreciated. Thanks!