I'm in the process of looking for an auxiliary fuel tank for my '05 Duramax. I think I have decided on a 60 gal toolbox/tank combo made by RDS and sold by Northern Tool. The tank has fittings for either gravity flow, or a pickup tube fitting for use with a pump. They also make a kit that installs between the low point gravity fitting and the filler hose that has a check valve built into it that shuts off the auxiliary tank when the OEM tank is full and fuel starts backing up the filler hose. Anyone have any experience with this setup?? In actuality I would prefer hooking it up to a pump over which I have control. Where can I purchase a small 12 volt pump to pump diesel. I understand that a regular automotive type fuel pump (i.e. Holley) will not stand up to diesel fuel.