My 240 had almost a pound of rust and crud. Tank cleaned up beautifully and I haven't had any issues since I coated it with Red-Kote. I'd already done the tank on my 280 and was anxious to do the 240 then I realized all the hoses and the evap tank I needed to replace. What a job that turned into! For my 280 I think I bought the last Bosch OE fuel pump in 2011 thinking that was my problem. Oh boy was I wrong! A lot of other problems with the EFI were ahead but I got it all worked out and made a fuel rail for it and put in a 6to1 ceramic coated header. The EGR was clogged up and caused a huge rotting hole in my aluminum intake manifold. It runs good now but only after adding a potentiometer to add more fuel to the ECU's coolant temp sensor function. I've got the OE pump still and it works fine but newer is always better. I think it was $250? I say run it until it starts not keeping the pressure you need. These pics of my 240 tank are not indicative of the 280s tank from what I've seen with my cars.