Fuel feeding system for aircraft

A fuel feeding system for aircraft having first and second fuel tanks, and including a fuel selector valve movable between first and second fuel feed positions to an existing aircraft engine, a first fuel line portion communicating between the first tank and said valve in said first position, a second fuel line portion communicating between the second tank and said valve in said second position, a third fuel line portion communicating from said valve in said first position to the engine and a fourth fuel line portion communicating from said valve in said second position to the engine, first and second indicator light means of a first distinctive color, first and second electric circuits from a power source such as a battery and connecting respectively to said first color indicator lights, means associated with said selector valve to selectively energize said first color indicator lights through said first and second circuits to visually indicate the valve position relative to said first and second tanks;

• first and second indicator lights of a second distinctive color;
• third and fourth electric circuit means from said source, connecting respectively to said second color indicator lights, first and second switch means in said third and fourth circuit means responsive to a flow of fuel respectively in said third and fourth fuel line portions to illuminate one of said second color lights to indicate an actual fuel flow from one of said fuel tanks to the engine as determined by said selector valve position, means for manual operation of said selector valve, a single indicator light of a third distinctive color, and a fifth circuit means connected from said source to said single light, and switch portion on each of said first and second switch means connected in series in said fifth circuit means in a manner so as to complete a circuit to said third color light only when there is no fuel flow from either of said first and second tanks.