Air in my KGB sac....

(chaser) · (chaser) **Join Date: Sep 2006** 07-18-2008, 10:51 AM

I have an 02 X-star. I beleive it has the original yellow KGB sac with the 3 fittings all on one end. The bottom is the fill/drain and the other two are overflow/vents. This bag is constantly getting air in it so it can't fill completely with water. I can sit and squeeze and "burp" the air out to fill it the rest of the way, but I would have to do this everytime. I'm thinking it gets air forced in there through the over flow and vent lines as I'm trailering it? Would putting a spring type check valve on these two lines (overflow and vent) prevent my problem? I would think with a spring check valve then the bag would get sucked down and compressed when draining and then the air wouldn't be forced in while trailering because of the spring check valves. Any ideas. Any one else have this problem?

(dizzyg) · (dizzyg) **Join Date: May 2005** 07-18-2008, 12:48 PM

when you sit on it - burp it, do you have to disconnect the overflows or does the air flow out of them as it should?

(chaser) · (chaser) **Join Date: Sep 2006** 07-18-2008, 2:08 PM

I don't have to disconnect it, I just have to squeeze the air out by hand.

(sulmaxwell) · (sulmaxwell) **Join Date: Dec 2003** 07-18-2008, 3:40 PM

how fast are you going while u are filling it???

(chaser) · (chaser) **Join Date: Sep 2006** 07-21-2008, 10:43 AM

usually fill at idle or very low speed, less than 5mph.

(wakemikey) · (wakemikey) **Join Date: Mar 2008** 07-21-2008, 1:13 PM

Why would you have a seperate vent and overflow? Can't you put the check valve on the overflow and that's all you need?

(chaser) · (chaser) **Join Date: Sep 2006** 07-21-2008, 2:30 PM

WakeMikey,
That's how the boat came. One fitting for filling/draining at the bottom of the sac, and then two lines toward the top of the sac for venting/overflow.