>You make a "U" shape out of the tube, with the 0-11 scale you marked on the
>left leg of the U, and the right leg of the U attached to the regulator.
>You fill the U with enough water that the base of the meniscus (the
>waterline) comes to 5.5", filling the bottom of the U.
>
>You turn on the gas, and plug the open regulator port with a spare
>finger(since there are two ports). The gas will push the water up the left
>leg of the tube...hopefully EXACTLY 11".

I was under the impression that a spec of 11 inches referred to the total
distance that the gas would raise a column of water.  In this example
therefore after making a "U" with the clear plastic tubing and filling
with an adequate amount of water and ensuring that the water levels were
exactly equal on each side of the "U", I marked the zero pressure water
level with a black marker, measured up the open end of the "U" 11" from
the zero point and made another mark labeled 11".  After opening the gas
valve, I adjusted the regulator until the column of water rose to the 11"
mark.

So which is it?  Does one measure the difference in water levels from one
side of the "U" to the other after application of pressure?  Or does one
measure the total distance that the gas has lifted the liquid from a zero
point on one side of the "U"?

Thanks,

Tony

Anthony L. Mourkas
Hampden, Maine, USA
1984 Vanagon Westfalia
1987 Vanagon Syncro GL
1991 Jetta Eco Diesel