I am installing the recommended Facet/Pure 104 pumps into my engine room next to the diesel fuel tanks. I have one pump per tank. (2 Pumps). The down and dirty: Can these pumps be mounted inverted? That is upside down? Will they still function correctly? I did not really get a straight answer on the Pur site. If anyone has an answer to this, would you be so kind an share it with me. Thanks in advance for the help/ Otherwise tomorrow I will have an answer and I will be sure to let everyone know!! John