Curious! The water pump on our 2000 Journey stopped pumping water on Thursday. Must have been some cosmic EMP that effects only water pumps. You weren't traveling through Texas, were you?. Ours was the original water pump as I still have the paperwork in our Manufacturers Parts folder.
According to the data sheet and the unit itself, here is the compiled information that you requested:
SHURFLO DIAPHRAGM WATER PUMP
PART NO. 2088-404-144
OPEN FLOW: 2.5 GPM
PRESSURE: 40 PSI
12v DC - 7.0 AMP
It would appear that most any pump will replace this OEM part. I am a little hesitant about installing a higher PSI unit into an already aging system. So, i will do my best to find a unit with specs as close to the original so I don't burden the 'ol girl's delicate belly.