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okay good, now we can all understand that you are on the right track to getting to the bottom of it .. You maybe have thought about disconnecting the existing wire on the valve and manually touching a temporary hot wire to the valve to test it for start up and shut down? (you will have to...

if you're able to start and run it with no power to the valve, then it apparently has a manual bypass knob and someone has put it in bypass.... some engines have it, some don't ... however, when the knob is in the bypass position, the only safe way to shut the engine down is either with the...