Whats preferred be as varried as the seas themselves!
Wether ye be wantin to put all yer dabloons in one pump or two be what it comes down to fer this scally wag. I'd be usin two to be given myself a wee insurance against failure. But ya might also want to be thinkin' bout maintenance. Two pumps make fer twice the work, but that's what the swabs are for! Although an external pump be leavin more room for precious other gear in the sump.
It comes down ta what fills yer sails lad.
-Mad Tom Roberts (
http://www.talklikeapirateday.com )