Completely cowled in engine. Cannot get to fuel lines. Have 3 line system at tank. When refueling how do I determine when the tank is full short of filling up the muffler till it runs out???

No, I cannot disconnect the pressure line from the muffler.

No, I cannot disconnect the line to the carb.

A "T" fitting in the pressure line will not work as fuel will come out of both sides.

I'm using an electric pump so I can't count turns of a nand pump.

There's gotta be a way. I'm stumped.

Any help will be appreciated.

Phil