I have an 87 Sailfish. Mine is reached in the head compartment through an access panel to the aft which would be directly under the helm. That was the old set-up.
In my '94 Explorer, it's inside the cabin, in the starboard side storage well. Check your compression fittings while you're there, mine leaked and filled the forward bilge with hydraulic fluid.
I know on my 265 it is under my v berth, and on a freiends 282 it is located there as well, might check there. It will show on your owners manual and tell you the exact location, on newer models they located them where it is easier to get to and access for maintenance.
Remove the plastic panel at the back of the extra bearth located at the bottom of the steps below the healm seats. The pump and reservoir are a single unit mounted in that space together with the waste storage tank.
