Re: HD/TD Float Height

[legendre]

quote aquasonic:

I agree with that. Maybe focus on the low speed needle, seat, and packing. Could it just be residual fuel that is leaking past the needle and packing?

I’m ready and willing to learn, but I can’t come up with any scenario where the carb bowl is filled (and stopped at) the correct fuel level, yet liquid fuel continues to issue from the low-speed bore on a stopped engine.

The way I see the system, fuel only travels up and into the low-speed unit when the engine is running and a vacuum is produced in the crankcase. Otherwise, the fuel level (below the fuel tank) can never exceed the level set by the float valve in the carb. In other words, the feed pipe to the low-speed unit will be about half-full of fuel in a static condition. Only when the motor is producing vacuum, will that fuel level rise high enough to enter the bore.

Well OK, or when the primer pump is depressed – but that’s a different matter.

ETA: Wait a moment.. is there a the possibility of siphon being established? How would the float system respond to that? Hmmmmm….