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you can get a vacuum diaphragm safety switch that will only let the propane flow if there is vacuum from a running or cranking over engine. such as this and it needs no power to run. I have one on my pressure washer and am using one on my generator install. http://www.centuryfuelproducts.com/brands/impco-replacement-parts/regulators/c-039-122-vaporizer-regulator.html
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