Cleaned out the garage and went to start the truck. Wouldn't start, It had spark and at first tried to run but stalled, It was 0 degrees out and I left it. I hadn't had it running in about 3 weeks.

Now today its 23 degrees and the truck wouldn't start. Would Crank over. I looked and didn't see it was getting any gas. I filled the carboreutor with gas and it started up and runs fine.

Just curious about why? If it isn't getting gas when I pump the gas for starting and it is when it is running... why?

Just so you know it is a 1980 318 with a four barrel.