Whats up guys. I have been researching some options here and just wanted to start a new thread so that I can ask specific questions. I bought a truck with a 30 gal gravity fed tank in the bed. The PO doesnt know how old the fuel is in the tank. I am going to siphon as much out as I can but would like some advice about cleaning the tank before I fill it with new fuel. I do not see any rust in the tank but the fuel does have a brownish tint to it. I will take some pictures today and upload them. I see other threads where some have suggested fuel system treatments with a full tank of new fuel and others that say to have it professionally cleaned out. I am guessing that would depend on how contaminated the fuel cell is. Is there a preferred treatment that would be safe without having to remove the tank and have it done by a shop? My truck is an 03 LB7 with all stock fuel delivery and filtration. I have a new fuel filter and will be installing a lift pump in the next few months but for now I was thinking to clean and get the aux tank up and going then change the factory fuel filter. Any advice is greatly appreciated.