The needle valve should keep gas in carb bowl for days. You have a bad needle valve, bad fuel pump check valve leaking or "boil out". Maybe a spacer is needed. Maybe a filter leak. Any leak can cause trouble. The bowl is supposed to have enough fuel to fire, the pump is supposed to have some residual pressure/vacuum/fuel to prime fast. It's possible with the relocation that you will need an electric fuel pump. What's the reason for tank relocation?

Also: Make sure your new gas cap AND/OR your new tank are VENTED.

Fuel lines/hoses/filters AWAY from exhaust and motor.


Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn