With the check valve I can see where it would stop the flow when the standard tank is full, the concept makes total sense. I guess you’ll know if it starts pissing fuel from the filler cap. 
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‘07 Mazda RX8
Past: 911T, 911SC, Carrera, 951s, 955, 996s, 987s, 986s, 997s, BMW 5x, C36, C63, XJR, S8, Maserati Coupe, GT500, etc
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