Since I bought a King Keg I have had nothing but problems. When the beer goes down about half way (below tap. It's a top tab keg) I get gas with the beer. I Was told that the plastic tube is too long by another home brew supplier. I took 4 inches of it and it did make a slight difference. I have it a 1/4 full with water and the float is floating squarely on the surface. Air is still coming out. I am TOTALLY fed up with these rubbish barrels.
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http://www.home-brew-online.com/equipment-c40/king-keg-float-system-p668
If you happen to have more than one barrel or are able to borrow one then the float could be borrowed for the other barrel to try it in the problem barrel and this will then prove either way whether it is the float system or not. We have heard of just one before that had a pinhole in the tube and it was this letting the air in when the tap was used, if you can't find anything obviously wrong with the float or pipe to it then it may be worth swapping the float system over
"The float should be on the surface and not sat on the bottom"
This is from an old barrel so it sits on the bottom. Don't ask me why but: It has to be the plastic tube, the fitting of the plastic tube to the wight insert or the very thin tuber washer. Why does the problem only happen when the level of the beer goes below the tap???
Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth. The barrel (yes, it is a keg really) holds its pressure over night. This rule out the 4-inch top cap and the outer extremities of the tap. I say the tap because if there were to be a problem with the tap’s outer washer and the outer parts of the tap including the nut then it would lose pressure if it was only partially full.
This leaves us with the inner workings of the barrel. I have used different tubes and floats. One from an old barrel doesn’t float well and lies on the bottom, so we can rule out the float issue. I have used different tubes including one known to be good so that rules out the tubes.
Air is only heard when the valve is open suggesting that the air is coming from within the tap not outside of it. This leaves the inner insert and the ridiculously thin washer.
sherlock Holmes would deduce that this is the problem.
If it is an older barrel then a drum tap such as this is ideal:
http://www.home-brew-online.com/equipment-c40/drum-tap-with-backnut-for-bucket-or-barrel-p611
I was told from another on line brewing supply that the tube in the king key is too long. I have noticed that my replacement is shorter.