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.

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