Replaced gas tank, won't start!

KJoeZ61 said

i just replace my gas tank and sending unit. Won't start! I put four gallons in turned it over and it ran for a half minute. I pulled the sending unit and the tube isn't blocked, but there didn't appear to be gas in the hose when I disconnected it. Shouldn't my fuel pump pick it up?

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Probably not enough time in half a minute at or near idle, to suck it to the front.
But that doesn't explain the empty line.
Furthermore, there should be more than a half a minutes fuel in the bowls of most carbs.I'm thinking more like two or even three at idle.
Blowing air back from the front is a great way to clear the line and prove it's not plugged. However, it does nothing to prove the pump can suck fuel up. If there is any place the pump can suck air, it will.