Rereading the last couple of comments I realize that is why you would want to use a check valve between the exhaust and fuel tank, to maintain constant pressure in the tank, no pressure fluctuation. Seems logical constant pressure in the tank should equal constant pumping of fuel. The faster the engine turns the more fuel is needed. That’s why the old time said it’s like a pump.
Am I full of it or have I been enlightened?
Bern
