Hi pegleg,
It's good to see that I'm not the only one who is thinking of mounting the pump like that. Maybe you also have the feeling that the pump's inlet and outlet should have been reversed to begin with. It would make a lot more sense in terms of mounting with the flow reversed (well, at least it does for me).
Judging from you picture, your pump is mounted/bolted directly to the chassis there. Does it generate a lot vibration noise like that ?