Low fuel indicating device

Details Low fuel indicating device Low fuel indicating device

1978-03-10

1979-09-04

Waring, Alvin H.

Communications: electrical

Selective

Having indication or alarm

340 27R, 340612, G08B 2100

Patent

active

041670027

ABSTRACT:
A device for detecting and indicating pending exhaustion of the fuel supply for an airplane or the like. The device preferably is connected between the fuel supply and the fuel pump of the airplane, and comprises a fuel reservoir bowl, a fuel inlet, a fuel outlet, a float switch above the bowl and a vapor orifice for directing fuel vapors from the upper portion of the reservoir bowl to the outlet. Some fuel passing through the device accumulates in the reservoir bowl and entrained fuel vapors move upwardly and pass through the vapor orifice to the outlet. When the fuel supply is low and more vapor is entrained therein, vapor is trapped in the upper portion of the device and forces the fuel level in the reservoir downwardly which causes the float switch to close a circuit to a low fuel alarm and/or indicator. The fuel in the reservoir bowl can be used for continued engine operation to allow sufficient time for corrective action after low fuel has been indicated.

REFERENCES:
patent: 4035789 (1977-07-01), Akita et al.
patent: 4037193 (1977-07-01), Vemura
patent: 4066997 (1978-01-01), Ohmi et al.

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