PureFlow AirDog Dodge In-Tank Modification Kit - Manual (Page 12)

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End result:
You should have a new suction tube that goes all the way down to the bottom of the
sending unit, be sure to drill holes where instructed in order to pull a sufficient amount of
fuel into the module.
The stock suction/supply fitting on the top of the sending unit will now act as the return
for the AirDog system, the new bulkhead fitting and suction tube will be for the AirDog
suction line and then factory return line will be reconnected back to the sending unit in its
factory position.
Fuel in – Suction from tank
Tank – Return from AirDog to tank
Engine – Fuel out from Airdog to Engine.