Fuel Tanks – The dual fuel system has a total capacity of 621 gallons of avgas consisting of two main tanks (210 gallons each) and one auxiliary tank (201 gallons).    The left main tank normally supplies fuel to the left engine and right main tank supplies fuel to the right engine.  However, the system provides for operating either engine with fuel supplied from either main tank or the auxiliary tank.  No crossfeed capability exists.

The main tanks are mounted in the center section between the front and center spars.  The auxiliary fuel tank is mounted directly behind the left main tank.

 Refueling is accomplished through gravity flow fillers recessed into the wing upper surface between each nacelle and the fuselage.  Each tank is equipped with a water sump and drain valve beneath the center section surface.

                       The mechanic would check for water in each tank  thru each tank drain.