Process of elimination, run it off a portable tank as posted, disconnect it from the top of the current fuel tank. Connect this hose to the portable tank if all is well its the fuel pickup strainer in the tank or the anti siphon valve on top of the tank.
You mentioned 60:1 mix it should be 50:1 Typo?
You ran this motor perfectly before so I don't this its anything to do with the disconnecting the vro ...
Be careful not to run it at WOT with a fuel starvation you will blow the power head ...
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