The flow is effected ( generally speaking ) by many things but what is important too is the temperature or at least the varrying daytime /nighttime temps. It is best if the temps get down to 25 at night so the sap will run back down into the roots then in the day as the temperature rises the sap returns to the limbs & branches. My budd has a set up he was cooking all day yesterday .... but as earlier this week when the temps stayed semi warmer in the evenings he wasn't getting much sap.
I will share a little known secret the sap cookers & fanactical sryup fans like myself hold close to the chest.... There is the Grade A amber sryup that everyone loves this comes out ( or is produced from the 1st batches of sap ) early in the season then at the end of the season the the sap produces a darker sryup ... most buying consumers & distributors love & cherish the Grade A amber ... for it is what everyone expects...... HOWEVER.... what I prefer and is way more valuable in the " Man Kave " and possibly considered the better stuff amongst some cookers I know is the almost dirty looking sryup that is produced at the end of season. It has flavor like none I have ever tasted.... That's the BEST stuff and what some cookers anyways... keep for themselves.
My syrup is very light...I'd say like the color of beer. It has an almost butterscotch taste to it...and is pretty runny. Don't get me wrong, I like it a lot, but wondering if I'm doing something wrong or if this is pretty much normal. I've been boiling small batches. I take it up to almost 220*, and then sometimes after it cools, I'll reboil it again.