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Re: duel tank switch in cab
not 100% sure, but I want to say I have seen a valve style switch that you twist located on the floor between the door and the seat. Push on the carpet and see if there is a hole there
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Chris
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1979 Chevy Stepside SPORT
2018 Chevy Silverado, 39 years apart 
My build 2008-2016. http://m.imgur.com/a/bURrE
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