Anyone recognize this fuel sender wiring?

[Wincks2]

My fuel sender has three wires. Black, yellow, and pink-white.

As none of my books show this wiring, not sure what year it is from or what they are for.

My book says my fuel sending unit should have one grounded to the frame and another going to the fuel gauge. I think those are the black and pink-white respectively. Have been unable to find any info about the yellow wire.

It has been running my 6.2 diesel. Although a prior owner had left the middle tube unconnected so when I filled it right up, fuel poured out the middle tube and down the tank's side. My book says the tube should be connected to a vapor canister to prevent fuel fumes from getting into the air. My other book calls it a fuel syphon tube.


[IMG][/IMG] My book says it is a fuel syphon tube. But I haven't learned what I should connect it to.
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