Ours is under the lift up panel in the cedar closet across from the toilet/shower. You should easily be able to access the pump as well as the associated lines.
Craig and Carol
1997 34' Excella 1000
1970 27' Overlander, International
2009 Ford F150 5.4L
ProPride hitch with 1400# bars
Past President Southeastern Camping Unit (12)