Hope everyone had a good New Year! Can anyone tell me what line goes where on a old style Tillitson carb? I know the fuel goes in the very bottom, then there is another opening midway up the diaphram, (maybe the crankcase line?) and another one on top with a hole the size of a pin. Can anyone verify what line goes where?
Bottom is inlet fuel line. The top one with with pinhole size hole is the return line to the fuel tank. The middle one must be the crankcase impulse line although the ones that were on my Skidoo's had the impulse line built into the carb from the back and came from an opening through the carb mounting block. Just a note concerning vapor lock on these old carbs. If you make the hole in the return line slightly larger it flows more fuel through the carb so it keeps cooler and doesn't vapor lock.