As far as they tell it they are correct, however they only tell part of the story.
It is indeed illegal to gravity feed directly to the carburetor or injectors. However, gravity flowing into the OEM tank is legal as long as the auxiliary tank has a vent protected by a roll over valve.
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2015 Ford F350 DRW 6.7 Diesel XL
2020 Avalanche 313 RS
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