So I emailed Aeromotive about this and they said it too restrictive for a high pressure pump to regulate down to carb pressures.
Their words (I was inquiring on their tank wit a carb then to EFI, referenced 13301 which is the same as the trick flow above)
"With the Gen II tank you’re limited to AN-06 line (same as 3/8” tubing) which isn’t big enough to control pressure with a carbureted bypass regulator (such as 13301). It’s fine for EFI pressures but the return is small enough to create too much back pressure for the low pressure application."
They recommend the 13220 regulator for the carb now and a 13138 regulator for the EFI later.
