RE: Backplate pressure question
I just make a .015 hole in the pressure tap so it dampens the pressure and fuel doesn't accidentally get in the crankcase. A check valve would do that too. I will admit I haven't tried it on a throttled engine yet, but it worked well with a centrifugal fuel switch and a pipe with a monster size hole in the carb. and control line goodyear racers. I will have to try a throttled one, but will be busy for a while. The new field isn't ready yet.