Design Improvements for the Zenith 601 HDS: Fuel Pump Switches

Fuel Pump Switches

The switches for the two fuel transfer pumps are mounted to the right of the ignition switches. Confusion of the two sets of switches is avoided by mounting the primer pump between them. The fuel transfer switches are spring loaded since it is easy to forget that they need to be turned off when the center tank is full. In that scenario, the center tank becomes flooded and excess fuel is dumped overboard via the main tank vent. As a result, fuel fumes enter the cabin via the tail cone, a very dangerous event.