Run it separately
I went through this a while back. And there was a discussion on SailNet. (But I can't seem to post a linkback to the Gear-Maintenance Forum thread 44434 from 6/25/2008 without the automatic shopping link interrupting!).
End result: Rather than putting another hole in the hull, I dumped the output from the second (electric) bilge pump into the cockpit, from whence it drained out the (sizeable) scuppers. Side benefit: when your feet get unexpectedly wet, you've just been informed you have a serious problem.
Last edited by jjablonowski; 10-27-2009 at 11:54 AM.