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 - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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