Had this rebuilt 3 months ago as I was having same problem. Worked fine until a couple weeks ago. I do get gas up to carb, just not into it. I pour a little gas in and it starts up but dies when that fuel runs out. This is a Rochester 1 barrel on a 235. My truck is a 1951 GMC 3/4 ton. Also, for a couple of starts a while back, I had gas leaking out of the carb. But it stopped and didn't have that happen anymore. I've changed the fuel filter multiple times and fuel looks clean. What should I check on the carb? Plan to pull it here soon.