Fuel System Headache

[Big Jay]

I inherited a clean 79’ Chevy C10 from my grandfather. The truck sat lifeless for a period of 4 years before I could get around to bringing her back to speed. There was significant amount of gas left in the tanks so over the spread of the last couple of weekends, I removed and flushed the tanks, replaced the mechanical fuel pump/filter and installed a new fuel selector valve (I broke one of the valves during the un-install…GRIPES!). After filling her up with fresh gas and with a little help of starter fluid she roared right-up. I was able to drive her for 12 miles where I ended up parking her for a week. Now when I try to start her up again I get nothing!!!! Putting gas/starter fluid in the carburetor will get her started but she dies as soon as she sucks down what was put in the carburetor. When I pump the gas I can’t smell it. Do you think my brand new pump went out already??? Given my limited mechanic skills, I was hoping some of the guru’s on the forum can offer a suggestion or two.

Thanks!
Big Jay