Thanks for everyone's replys. The following is exactly the trick I
was hoping for !
Jeff Page
Dream Aircraft Tundra #10
> From: Steve Ruse <steve@wotelectronics.com>
> Subject: Re: Fuel pump control
>>
> It is pretty simple to do this if you use a fuel pump and relay coil
> that require the same voltage. Use a pressure sensor to control the
> relay. Connect the relay output to the fuel pump AND to the relay
> coil (input). That way when the fuel pump comes on (due to a low
> pressure signal), the relay locks itself on, regardless of the state
> of the pressure sensor. To turn the pump off, you would have a
> momentary switch in the circuit that would break the connection to the
> relay coil. This used to be called a "seal-in" circuit for industrial
> controls.
>
> Steve Ruse
