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On second thought, maybe it won't work. The return flow wouldn't make it up into the tank. It would just "turn the corner" at the bottom of the petcock and go back to the fuel pump.
To make this petcock function as a true return-to-tank path you'd have to figure out some way of routing the return flow up one of the feed tubes, either the "On" tube or the "Reserve" tube. Unfortunately, the OEM petcock is so minimally cast that I can't imagine how you could modify it to do this task.
So modifying the OEM petcock is out. But I also believe that drilling holes anywhere in the fuel tank should be ruled out also.
I think that somewhere way back in this thread there was somebody saying they'd found an aftermarket petcock that would fit the EX-250 and it had a simple "feed on one side - return line into the tank on the other side" design. That would be the best solution.
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