Okay, some more questions:
How does the rear tank fill? Second filler neck?
Does the switch have only on/off, or on/off/on?
The pump you hear, is it inside the tank or external?
How much fuel is in the rear tank?
Where are you located? (consider adding to your profile info)
Some pictures of the rear tank and hoses would help.
The whole Trax 2 system was designed to transfer fuel to and from the rear (Aux) tank. It kept the fuel amounts in the tanks in balance. Nice but really complicated. It typically was ~ a 24 gallon rear tank with an internal pump, this was mated w the stock main tank. Is there some documentation you have that specifies 30+30?
Beastie 3: 2002 7.3 EB Cargo: Agile TTB, CCV High Top, Custom Walk Through, Lots of stuff added. www.BlingMyRig.com