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filter sensor

For all things Electrical.

Moderator: -Scott-

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Posts: 254
Joined: Sun Dec 18, 2005 10:44 pm
Location: adelaide

filter sensor

Post by numbnuts »

does anyone know how the filter sensor works on a nissan fuel filter on a 4.2 GU td? I put a multi metre on the two wires going to the filter and they seem to both be earths.
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Post by ausoops »

was the ignition on? there is a 'float' (i think its a reed switch) of sorts in the bottom of the filter that closes a 12v circuit when there is water in the filter. one of the cables will be +12v (ign on) and the other will have nothing on it.
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Post by numbnuts »

put multi meter on the two wires red lead to battery + and black lead to wires to sender both wires show 13 volts.
GU 4.2TD
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looking for that perfect route?
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Joined: Sun Jan 11, 2004 11:36 am
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Post by -Scott- »

Congratulations! You've just confirmed your first statement that both wires are earths.

This means the sensor (whatever it is) is effectively closed. According to ausoops' post this would indicate water in the filter. Can you move the filter float around and see if the wires give different readings?

Scott
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Post by numbnuts »

moved the float thing down the bottom,no change in the earth state.
GU 4.2TD
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looking for that perfect route?
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Posts: 14209
Joined: Sun Jan 11, 2004 11:36 am
Location: Adelaide

Post by -Scott- »

Then I'd say the sensor is stuffed. Take your multimeter to a wrecker, and run the same test on their sensors. If you can see something change as you move the float there's a fair chance it's gonna work.

Good luck,

Scott
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