2001 Marlin - I want my fuel tanks to drain down at the same rate (assuming that is the ideal setting). The valves have a main and auxiliary setting (see picture) as does the switch at the helm. The manual says that the panel switch at the helm only indicates the fuel level and does not select the tank in use. One valve is currently set to main, and the other valve is set to auxiliary. Does that setting mean that the tanks are drawing down at the same time (i.e., one engine draws from the main tank, and the other engine draws down from the auxiliary tank)?