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Rear PNP how they work


Bwhit

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I’m just trying to wrap my head around this concept. I’m sorry for the lack of knowledge. 
I have 2 750 PNP bags in the rear locker. They have the manual bleeder. Lately I have been lazy and just wait for the overflow of water to come out of the side of the hull, s*** the pump off and start surfing. 
Now the over flow tube attached to the bag is on the top of the bag( like most of them are).... so wouldn’t my bag be full of water up to the point where the overflow tube attaches to the bag? As the bag is filling isn’t air escaping out of overflow tube?
By not bleeding the bags manually wouldnt I only be missing maybe 10ish gallons of water in the bag?but the lowest point is still the overfill tube so wouldn’t water still travel out the overflow tube if I did burp the bag to get more water in it? 

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granddaddy55
7 hours ago, Bwhit said:

I’m just trying to wrap my head around this concept. I’m sorry for the lack of knowledge. 
I have 2 750 PNP bags in the rear locker. They have the manual bleeder. Lately I have been lazy and just wait for the overflow of water to come out of the side of the hull, s*** the pump off and start surfing. 
Now the over flow tube attached to the bag is on the top of the bag( like most of them are).... so wouldn’t my bag be full of water up to the point where the overflow tube attaches to the bag? As the bag is filling isn’t air escaping out of overflow tube?
By not bleeding the bags manually wouldnt I only be missing maybe 10ish gallons of water in the bag?but the lowest point is still the overfill tube so wouldn’t water still travel out the overflow tube if I did burp the bag to get more water in it? 

that “overflow” tube is an auto vent, are you saying you still needed to bleed manually, maybe auto vent is kinked?

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Yes there still is a good amount of air the gets in the bag. Therefore I was having to open up the manual bleeders to burp the bag. But then I started thinking what’s the point. There is already water coming out of the overflow tube, if I was to burp the bag to get more water inside wouldnt it just go right out the overflow? 

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