Water in fuel circuit

[laserjock]

Could someone please educate me on the WIF circuit? If you look here, there are 3 wires labeled WIF (A,B and C).

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Near as I can tell there is one wire going to the sensor on the fuel filter. I've been through my manual and I don't know if I'm tired or it's just not showing me what I need to know.

I think I've got the rest of the original engine harness sorted. Just have to figure this out.

Thank guys.

 

[79jasper]

Look for that little relay looking thing. It's for that circuit.

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[laserjock]

Some google searching has turned up this thing.

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I need to go find the old harness and see if I have that bit. Anyone know how it actually works? I always just assumed the sensor would read continuity when water bridges a pair of electrodes on it. Never really gave it a ton of thought. Guess that's not exactly the case.

 

[carrasco4712]

Some google searching has turned up this thing.

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I need to go find the old harness and see if I have that bit. Anyone know how it actually works? I always just assumed the sensor would read continuity when water bridges a pair of electrodes on it. Never really gave it a ton of thought. Guess that's not exactly the case.

That is what I thought also, I'd like to know what the smart ones here have to say.

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[79jasper]

I can't remember exactly how it works.
It's a solid state relay though.

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[Macrobb]

It's something like that. Pretty sure the WIF sensor wire on the fuel filter will get grounded to the body of the filter by the water, at some resistance.
The WIF module, I'm guessing, has a relay and a couple of transistors in there to amplify that current 'signal', and when the resistance gets low enough it turns on the output wire.

I do know that if you let the WIF sensor wire dangle next to the intake manifold, and it sits in a pool of leaked fuel, the light will flicker on and off.
Maby there was water in the pool of fuel? Maby the resistance of fuel was low enough to turn it on, when the distance was less than it would be in the fuel filter?
Not sure. Moved the wire and it stopped coming on.

 

[tbrumm]

Some google searching has turned up this thing.

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I need to go find the old harness and see if I have that bit. Anyone know how it actually works? I always just assumed the sensor would read continuity when water bridges a pair of electrodes on it. Never really gave it a ton of thought. Guess that's not exactly the case.

So that's what that little black box is - the WIF relay! I learned something today - thanks for asking that question!

 

[79jasper]

It was used on a lot of international engines.
Was still used on the 7.3 powerstroke also. Maybe more.

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[laserjock]

So it is in the harness up next to the IP connections.

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It plugs into a metripack 150.2 series connector.

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That is the pull to seat variety. Still don't know exactly how it works but if I'm gonna use it I guess I need all the wires.

 

[laserjock]

This is actually the correct connector.

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If I figure out how the damn thing works I'll update this thread again so it's all together.

 

[ifrythings]

There is only a transistor or two in there with a few resistors, I ripped one apart awhile ago, the water isn't conductive enough to turn the light on so they use the transistor to amplify the signal and drive the light.

The 4 pins are
Black/Lt blue, from ignition switch, grounded while starting (bulb check)

Red/yellow, ignition power feed

Red, power output to WIF light when water detected.

Lt blue goes to the WIF sensor