Fuel Tanks, Main & Auxiliary.(RansMail#3)

The main tank is behind the pilot's seat, it holds 18 ltres.

                                                            12 Litre overhead tank

The auxiliary top tanks come in 2 nominal sizes. 12 litre and 16 litres. You can tell which you have depending on the profile at the rear. The 12 litre tank goes to a point while the larger one has about 2 inches of flat vertical at the back. In general, the nosewheel type must have the small top tank while the tailwheel version (being slightly lighter) can have the larger. Whatever the situation, you will be within one or two pounds of max. weight with a long range tank fitted.

The overhead tanks will hold a few litres more if fully filled, but this tends to disappear overboard in flight via the vent pipe.         
                
Said to hold 18 litres safely Vertical edge at the back end and deeper underneath, hanging down about one inch each side of the tube mounting.          18 Litre overhead Tank