I hear that you do not need to pull the front tank to R&R the sender, but I pulled my tank last summer. The showerhead at the end of the pickup tube had disintegrated into a million little black beads. The inside of the tank also had a "scummy" coating on it. I bought some Purple Power degreaser at WallyWorld and poured that in full strength. Then I took a scotchbrite pad and scrubbed the surface inside - whatever I could reach through the sender hole. Also mounted the pad on a wood dowel so I could reach in further. Then I let it soak overnight. The following day, I rinsed the tank out with hot, soapy water, then just water. Following that, I set it out in the hot sun to bake and really dry out. You could also use a neat gun or blow drier to dry it faster. After that, I sloshed a little clean diesel fuel around inside it just to coat the inner surface to prevent rust before I refilled it. Seemed to work fine. At the first fill, I dosed the tank good with DieselKleen. Good luck with your project. I am sure others will offer more helpful advice too.