You have a vacuum lock on the carboy.

Maybe it would be easier to explain with a little science trick. Grab a tall
glass from the kitchen cupboard, Fill sink with water. Completely immerse
glass into water and lift glass by the bottom slowly out of the sink. Note
that the water stays in the glass till you reach the point that air can get
in.

The carboy needs air to displace the wine during a siphoning. Those bubbles
were because air was getting in through the loose tubing.

Brian


"Jeffrey Hallett" > wrote in message
. com...
> I'm trying to make things a bit more sanitary in my winemaking process, so
> I bought myself an auto-siphon. A 3/8" I.D. hose fits over the pipe
> coming out of the auto-siphon, a little loose for my taste, but a 5/16"
> I.D. hose will not fit.
>
> So, my issue is this: when in use, it seems like a lot of air stays in
> the hose and I can see bubbles all along the length.
>
> The solution I've tried so far is to just have a very short length of 3/8"
> hose at the end of the auto-siphon, with a long length of 5/16" hose
> crammed into the other end. When it works, it seems to drastically reduce
> the bubble problem, but I do seem to have trouble keeping it going.
>
> Any suggestions?
>