Gents,

I'm using a stock Mazda fuel pump and assembly in my feeder tank. A fuel low
level warning probe is part of the assembly holding the fuel pump.
It's normally extended down to the bottom of the car's fuel tank. I've bent
it up to give me an indication when the feeder tank is NOT full.
The probe has one wire that comes out of it to the top plate of the
assembly. I put my multimeter on the wire and on a ground (since I didn't
know where else to put it and selected OHMs on various scales. I dipped the
probe in and out of a can full of gas without any indications on the
multimeter. If the probe is a switch, doesn't it need two wires? What makes
this probe work?

Thanks,
Sandy McNabb
Glass Goose with Rotor

Good question. I have never ever seen one. If it is anything like the low
oil level sensor it is a reed switch with a magnet float.
http://en.wikipedia.org/wiki/Reed_switch
One wire is grounded to the chassis.

Sometimes the level sensors are pots on the end of a float arm.
That will require two wires.

Take some pictures.

Here is the aircraft way of doing it.

Paul Lamar ...No rotor no motor.


If you are looking for a sensor that will indicate when your feeder tank is
not full, you might want to consider the product shown at this web
page:  http://www.aircraftextras.com/LowOilSensor.htm

Although it is promoted as a low oil level sensor, it works equally well in
fuel or water. The optional blinking LED setup is needed to have a panel
warning system that comes on when the fluid level drops below the top of the
float.

Rogers, Bob J.

Paul, Bob, et al,

I've attached two pictures of the probe.

Thanks for the web site for the oil level sensor. However, I need a
sensor/probe that will attach to the top of the tank to sense lack of fuel
at that location so I can be warned when the tank is NOT full. If I can't
figure out the Mazda probe works, then I'm thinking about using a sensor
normally used in house security systems that activates with a magnet. I'd
have to evaluate how it would hold up in fuel. Other than that, it is
completely sealed.

Thanks, Sandy

Could be a capacitance type.

Paul Lamar


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