Thought anyone interested also might like to know that the pumps used for model airplane fuel are peristaltic pumps in a small package, run on 12v, and pump decently fast.

For example:

http://www2.towerhobbies.com/cgi-bin/wt ... LXVZ40&P=0

is only $13.


Ive got several for my model airplanes, and hooked one up to test as a bleach injector and so far its working great.