Water in Fuel sensor wiring?

[spitfirenut]

Does anybody know or have access to the wiring diagram for the model 80 stanadyne filter housing. My WIF sensor in the tank has been hosed for years and the new engine has a model 80 filter(84-newer) with the integral WIF sensor. Since I broke it off and had to buy a new one (ouch) I figure I might as well use it but don't know the wiring of the sensor. I think the red/black is power in and yellow black is sensor out and the black is ground, but I'm not sure. Thanks

[More Power]

Pin A - Bulb Test
Pin B - Battery Neg
Pin C - Battery Pos
Pin D - Signal Light

The WIF sensor used in a Stanadyne model-80 fuel filter assy is a capacitive probe. The electronics within the probe will connect a ground to the ground side of the water-in-fuel lamp circuit (250 ma max).

On 1984-1/2 and 1985 models (3-wire sensor models), the glow plug lamp will illuminate 2-5 seconds, then fade out. This is the "bulb" check.

In newer models, a "bulb test" voltage will be applied to Pin A (4 wire models) when first rotating the ign key to START, to test the circuit.

MP

[spitfirenut]

Thanks Jim, the sensor I have is the 3 wire, A is red(pink?) and Black, B is Yellow and black , and C is just black. So the black is the signal light, the yellow/black is pos, and red/black is neg or am I looking at it wrong. My idea is to hook it to the water in fuel light, which apparently should have a ignition hot to it and ground through the sensor. Is this correct? Thanks again

[NH2112]

The WIF sensor doesn't directly illuminate the WIF light, it goes through a module under the dash that turns the light on when it gets the mA signal from the sensor.

[spitfirenut]

Thanks Phil, I'll look at the schematic and see if I can get it figured out then. The in tank sensor and the in fuel sensor both work the same I guess, in which case I should be able to hook the sensors indicator lead to the location where the indicator lead from the tank sensor is connected and it should work the same. That helps to know that there is another piece in the circuit. The bulb has been removed for about 10 years because my uncle got tired of fooling with it and we haven't had any real problem with water in the fuel, but since I bought the sensor I would kind of like to hook it up.

[More Power]

If the WIF lamp driver module under the dash is inop or lost, you could use the WIF sensor to activate a relay, which could then carry the higher amperage load of a lamp.

The info posted earlier came from a mid-80's GM 6.2L training manual. I haven't personally verified it.

MP