Awd conversion. Where does this connector go?

[v8s_are_slow]

Posted this on the awd conversion post but since I edited my post, I guess no one is seeing it. I'm trying to get my awd gas tank installed but I have this one connector that I'm not sure where it goes. Some idiot at my school threw away my fwd pump assembly so not sure if it went to that or not. Regardless, I dunno what I need to do with it, if anything. Anyone able to help? It's really holding me up in my conversion process and need to know what to do with it. Thanks.

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[19Eclipse90]

Some idiot at my school threw away my fwd pump assembly so not sure if it went to that or not.

Fuel tank differential pressure sensor which is on the fuel pump assembly.
It is a 3-pin black connector. Wire 1 is blue w/ white, wire 2 is black, wire 3 is green w/ yellow.

 

[v8s_are_slow]

Okay, but there's no place to connect it to on the awd tank. Is it needed?

 

[19Eclipse90]

The sensor wasn't implemented until 1998 so if you are using '95-‘97 donor parts, there won't be a sensor there. What it does, exactly, I'm not positive.

 

[v8s_are_slow]

Thanks. I haven't seen it discussed anywhere and when doing the wiring, I was stuck on this part. Car is a 98 and donor car was a 95. Thanks.

 

[19Eclipse90]

These are what I could find, but even they don't answer what it does:
http://www.dsmtuners.com/forums/newbie-forum/291478-98-awd-fuel-tank-differential-pressure-sensor.html
http://www.dsmtuners.com/forums/articles-electrical-wiring/244376-oxygen-sensor-wiring.html
http://www.dsmtuners.com/forums/newbie-forum/338015-fuel-pump-connector-question.html
http://www.dsmtuners.com/forums/newbie-forum/292590-1999-gs-t-fuel-pump.html

Sorry I can't be of any more help there.

 

[turbo98eclipse]

BAMM!! Now tag this post as helpful Differential pressure - low pressure [Archive] - Innovate Motorsports Forum

The answer of what it does is (copy and pasted):


"The fuel tank pressure sensor is a 3-wire strain gauge sensor much like that of the common manifold absolute pressure (MAP) sensor. However, this sensor has very different electrical characteristics due to a pressure differential design. The sensor measures the difference between the air pressure, or vacuum, in the fuel tank and the outside air pressure.

The sensor mounts at the top of the fuel tank sending unit. A 3-wire electrical harness connects the sensor to the control module. The control module supplies a 5 volt reference voltage and ground to the sensor. The sensor sends a voltage between 0.1 and 4.9 volts. When the air pressure in the fuel tank is equal to the outside air pressure, such as when the fuel fill cap is removed, the output voltage of the sensor will measure 1.3 to 1.7 volts.

I'm not sure about those voltages for our cars, but that's what they are in GM cars according to a GM handbook.

 

[v8s_are_slow]

Thanks man. Surprised this wasn't covered in the awd conversion pages. There's only like 11 or 12 pages of it and no one mentioned it. Sure helps. Guess I'll just fold the wires over and put heat shrink around it.

 

[azdave]

The FTDPS is part of the OBDII circuit that throws a CEL if you have a bad gas cap or a missing gas cap. That OBDII check would only be done by 98 or 99 ECUs.