I’ve seen separators for sale on eBay for later motors that direct the vapors back to the carb and the liquid collected is pumped back into the carb fuel line. No capture tank needed. This is quite an expensive set up.
I’ve posted about my set up before on my 1957 35hp RD. I use a separator and route the vapor back to the air box via the carb fogging opening and collected liquid gravity drains back to a Moeller 15 gallon main fuel tank. I’ve got a fuel pump on this motor. The separator is an air compressor water separator.
After crankcase pressure pushes the liquid out via the crankcase drain reed valve assembly there is a surprising volume of fuel/air mix that also ends up being discharged. I’ve captured this fuel/air mix and am burning it. Surprisingly the inside of the air box stays clean which was a concern of mine.
My earlier system collected liquid in a one gallon tank with vapor going to the air box via a second connection to the tank. It got old emptying the one gallon tank.
