2001 GT40 cooling problem

Current issue: Took my 2001 SAN with GT40 engine in for routine oil change/impeller change/spark plug swap.  I Have had boat for 5 years and has run perfectly throughout this time.  First trip out of marina after maintenance the boat overheated (didn't even make it out of 5-mile an hour zone!).  Pulled the boat, did my own impeller swap for a OEM impeller.  The "new" one that had been put in by shop was torn and a little shredded.  Even after the new impeller swap I couldn't get the boat to suck water from a bucket during an out of water start.  I do not think this is a case of clogged tubing given the boat never cooled after impeller change.  

I appreciate any thoughts on what might be going on.  Seems like this should be a simple fix (could the pump have been replaced upsized down?).  

Thanks,

Sacramento Boater

Thanks for quick reply!  I think you can see from the orientation, but this is top down shot looking down what would be connected to the outflow side of the pump.  This is the way the shop reinstalled but I'm not sure how to tell if this is the "correct" orientation. 

JQ

Kirt,

I certainly hope you inform that shop/so called "marina" that they installed the RWP backwards. I'd print off that illustration Ken posted and drop it off to them!  Any plans on taking the boat back to them? 

It's an easy mistake but they should know the difference. Didn't they water test it after the "service"?