Originally Posted by firedoc
What about the external tank sensors?
FireDoc, from what I understand about external sensors (and that is not much) is they read through the tank. That being said any build up, scum, or scale on the internal walls will effect the readings. A good internal cleaning should help them read better too.
I use the softner, simple green/dawn, and driving around for awhile method when mine act up and they are good to go for another couple of months. Even with fushing with a lot of water while stationery after every dump they still seam to act up after a couple of months. JM2C.