I have a 2002 26X. The factory does not install bilge pumps. I bought an electric bilge pump 2 seasons ago and have yet to install it because I couldn’t figure out where to put it.
According to the factory, (a) there is really no common low point to place the pump, as the bilge is criss-crossed with ballast tank and structural members, and (b) "you should never have any significant water in there anyway".
After futzing with it for the aforementioned 2 seasons, strangely enough I've come to agree with them on both points. It seems that the ballast tanks divide the bilge into at least 3 areas, and water does not pool between them. So to really cover it, you'd need pumps in all three areas. And I have to say, after having and really using the boat-- including Key West to Dry Tortugas and back in 8 ft seas-- it doesn't really seem to get water in the bilge.
I may still put it in. Seems like pretty-good locations would be under the aft settee / cooler, or under the galley to get the starboard & port sections, respectively. Unfortunately, I see no place to put one in the center section without cutting fiberglass.
Best of luck with it.
Ted