I'm not sure how the Generac is fueled, but the current (square box) style Champion inverter generators do not have a fuel pump. They are gravity feed, so the aux tank must be elevated higher than the generator fuel cap for it to flow fuel. There isn't any information available on the new style Champion to indicate whether it will have a fuel pump or not, but my guess would be that they will stay with the current design and it will also be gravity feed.
Possibly your friend's Generac is the same? If so, he may get it to work by leaving the aux tank in his truck bed and sitting the generator on the ground? Then, again, his generator may be like the Honda and have a fuel pump????
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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