DeWalt 8250W Open Frame Petrol Generator DXGC8250i

Purchased from Total Tools in Feb 2022. Made the decision to purchase this due to its Honda motor and their renowned reliability. Fuel tank has now started to rust internally, badly (intake screen is clogging with rust particles and causing the machine to stop). Disappointing as I have always taken great care regarding servicing etc and have always used Premium fuels. Have been told by Total Tools there is nothing they can do as it is outside the 3yr warranty (by a month???!!) and that Dewalt will simply wash their hands of it. They recommended I take it to a local service rep and plead my case. So frustrating!!