Like DebnJim said. all Gravity feeds have a check valve that shuts off flow so you never need to shut the valve. This is more of a problem with electric pump feeds. My last truck had an electric point to transfer had to have a timer switch installed because if you forgot and left it (the pump) on you would have problems. This is actually why I decided to go gravity this time. I have had both and my preference is gravity. There is no need for the extra expense of Pump and switches just one more thing to fail or require maintenance.
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