Gravity
Cliff,I just had this discussion with a neighbor. You need to consult someone who knows your engine. Some of the "built in" tanks utilize gravity to feed the fuel to the carburetor. The "remote tank" fed motors may have a small fuel pump.In any case, check it out before you go out and try to convert it on your own! I have had good success with online information with Tohatsu outboards, you may find the answer online if you use a good search engine like "google" and enter your engine's name(use link below).good luck,Mike D.