Dual-Fuel Propane System Install - Running Clean & Green. Dual-Fuel Propane Install. Johnny Kingfisher Writer Mar 01, 2008. See All 11 Photos. ... not vapor from the top as the BBQ or RV tanks do.

The RV has two electrical systems: a small 12-volt battery system that runs lights and starts some basic appliances. ... Up next is the propane system. Look closely at the tanks for dents, ...