Tip..... All know that I had mounted my Delavan in a boat box upside down. Just a neat way to keep pump upside down and simple place for switch to be mounted and keep pump out of weather. Anyhow, recently had a hose come un-done at barb on outlet side INSIDE box. Filled the box full and submerged pump in roof strength LOVE.
We drained box, hooked it all back up and it actually worked afterwards. That pump is awsome.
Lesson.... If you mounted in a box, like mine, drill drain holes... LOL