About 14 years ago now, I used to fly a Navajo and a Cessna 421 B and seem to remember the Navajo being a rather complicated fuel system, specially on the crossfeed. I am open to correction now, as I fly the Airbus A340 for the last 4 years, but the Navajo was "dead engine, dead tank" and therefore the selector for the dead engine went to off and the live engine was to crossfeed.
The Piper range seemed a little more involved than other aircraft. One always had to think more than twice before moving the selector valve in a Piper.
The C310, long nose was another story when swopping between mains and Aux and I seem to remember that the tip tank was the main which had to be selected for take-off and landing. Sometimes I would forget to change from the aux back to the main whilst cruising in the Namibian sun and I would get the odd hiccup of an engine coughing from a dry tank, which was a big wake-up call.
As we couldn't change the fuel systems and had to live with them, it gives one and open mind for all the other aircraft you will come accross in your career, so there is a positive point in all of this. The experience learning curve just keeps bending.
