Have you checked to see if the choke is working? If the tank and petcock are clean and working properly, I would probably check that next.
You still haven't said if it had a vacuum operated petcock or not. If it does, you want to make sure it's only opening when vacuum is supplied. If it's letting fuel out with no vacuum that can mean it's bad.
If it's just a normal gravity fed petcock, then makes sure it's clean and flowing.
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