It should take either 1/2" or 1 1/2" water column vacuum to open the regulator, depending on the model. There should be no fuel leaking through the regulator until this vacuum is applied. The problem you have is bin the regulator. They can be tested out of system by applying shop air to the LP inlet side and checking for leaks.
The amount of vacuum needed is very small. 1 1/2" of Water Column is the amount of vacuum it takes to raise water 1 1/2" as you s.u.c.k on a soda straw.
The primer button on a regulator works by depressing the diaphragm the same as applying vacuum would do.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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