The CO2 pressure is dependent upon many things. While there are formulas out there for calculating the pressure (which I'm sure you've found by now) there is quite a bit of trial and error involved. Is 15 a good starting point? Sure, why not. Just like 12 would be a good starting point. Give it a go and see what happens. Now for the fuel cutoff in the beer line. I think that's going to be a bad idea all the way around. First it was made for fuel, not a consumable food item. There's no telling what kind of greases, solvents or lubricants were used in the construction of that thing. Why would you drink anything that came through it? Second, you're introducing a restriction in the line even in the fully open position. Even if all the surfaces were smooth and clean I would expect it to be a great foam generator just because of the restriction. I'm curious as to why you would need a shut off valve?
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