Extra sensor on fuel pump assembly?

[Aceman]

So im doing a fuel pump upgrade while following the vfaq, and I found that the top of my fuel pump assembly has this extra connector on it...my search only brought up topics with no answers as to what it actually is. I looked up the numbers on it and its a pressure sensor. As of right now, I don't like that I have another sensor for reasons unknown to me. I dislike unnecessary sensors...they just die and the pressure ones make weird noises that I have to figure out...I think when the car eventually gets rewired I'll have to remember to replace the assembly and trash the sensor. IDK, haven't put much thought towards that and now I'm rambling. Here are the pics:

Standard 2g FWD:

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Mine (99 GST):

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And the part at some random auto part website:
Pressure Sensor MD 322973 MITSUBISHI

 

[19Eclipse90]

http://www.dsmtuners.com/forums/drivetrain-tech/399796-awd-conversion-where-does-connector-go.html

 

[Aceman]

So since its ODBII, what if I switch to an eprom ecu from a 95/96? I'm assuming its just going to be a useless sensor...

 

[19Eclipse90]

All 2Gs are OBDII. But the fact this wasn't implemented until '97 means that with a '95-'96 ECU, yes, it will be a useless sensor.

 

[Aceman]

Lol, I should've remembered they were all OBDII, it was just the way I read azdave's last post there that threw me off. That and I wanted to get back to focusing on mah fuel pump. Oh well, internet mistakes be damned. I got my fuel pump in with no real issues, thanks for clearing that up for me! Now I won't have any questions about it when I do the rewire, or if/when I get an eprom. I freaking love this site.

 

[xlMcMlx DsM]

It's used to test for EVAP leaks. The PCM will draw the tank into a vacuum, OR pressurize it. It will then close the valve it used to do this, and watch the pressure sensor. If it stays stable, the tank and related lines, vacuum hoses, etc. are leak free and everything is kosher. If the pressure/vacuum drops, it will see this VIA the sensor, and set a check engine light.