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Old 02-11-2009, 02:49 PM   #1
SenorMcNasty28
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Default Fuel Tank Pressure Sensor

Hey guys. A am an active member of RS25.com. I posted this question there a few nights ago but am having trouble getting responses. Since this is not really pertaining to the GC8 I figured this forum might be more suitable. I know this isn't the right section to post this question but I'm not really sure where it belongs. I'm sure a mod will move it to the appropriate location.



Quote:
Hey there knowledgeable Subaru people. I am working on my swap and am trying to gather the last bits needed. The guy I bought my donor car from said he was running the car with a CEL because he never got the Fuel Pressure Sensor from an 06 WRX. I do not want to roll with a CEL so I am now looking to pick one up.


First of all what are my options? I don't feel like picking through a junkyard. Can I just order one from Subaru? Do I need a part # or will they know what sensor I need? I know the plug # which goes to the sensor but not the part # of the actual sensor.


Also do I need to install the sensor? How involved is this and where is it located? I'm guessing it's not too important if the PO didn't bother picking one up. Will simply connecting the sensor and mounting it somewhere in the car rid me of the CEL? What exactly does this sensor do?


Sorry for all the questions but I know you guys are the best people to ask.
Thanks in advance for any help.
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Old 02-11-2009, 03:33 PM   #2
i_c_the_light
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I have never heard of such a sensor unless it was implemented on the later models.
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Old 02-11-2009, 05:38 PM   #3
dryvby
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post your trouble code or search and then post what the translated code is
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Old 02-11-2009, 08:15 PM   #4
2xhighpsi
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I had this CEL. F O R E V E R.

P1446 - Yours could be P1447 as well i believe.

I have an 04 STi swap with 02 tank and the sensor was not used until the tanks of 04+.

Romraider took care of that though
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Old 02-11-2009, 09:20 PM   #5
SenorMcNasty28
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Quote:
Originally Posted by 2xhighpsi View Post
I had this CEL. F O R E V E R.

P1446 - Yours could be P1447 as well i believe.

I have an 04 STi swap with 02 tank and the sensor was not used until the tanks of 04+.

Romraider took care of that though


Ya it seems like the best option is to find someone with opensource to just override the CEL. Anyone have any ideas on how to find somebody. I live in Central MA.
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Old 02-11-2009, 09:22 PM   #6
MasterKwan
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Romraider did? Does it affect how the car runs? I'd THIS close to swapping fuel tanks and harnesses to get that sensor and any other senser the 05 STI uses in the tank. I'm not that keen on doing the tank though (I suppose I should, to do a complete swap job)
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Old 02-11-2009, 09:50 PM   #7
69subaru360
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Quote:
Originally Posted by MasterKwan View Post
Romraider did? Does it affect how the car runs? I'd THIS close to swapping fuel tanks and harnesses to get that sensor and any other senser the 05 STI uses in the tank. I'm not that keen on doing the tank though (I suppose I should, to do a complete swap job)
It's just an emissions thing, doesn't affect how the car runs. I would turn the codes off. Much easier than swapping tanks.
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Old 02-11-2009, 10:43 PM   #8
EvenSteven
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Even my 01 RS has this sensor on it. The signals sent from it are exactly the same as the 06 STI. I checked it out. There are three wires going to it. Just splice the wires if you need to. You dont have to drop the tank for that you could just re-pin it at the connector under the rear seat. Im not sure how you have it wired or what is wrong.
Most likely it is not even your sensor at all. It could just be that you have a leak somewhere in your evaporative emissions system, or even something simple like a bad gas cap. Check that out first.
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Old 02-11-2009, 10:48 PM   #9
SenorMcNasty28
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I haven't actually completed the swap yet. This was just based on information given to me by the PO. I will check on Saturday when I get working on this Even.


edit: looking at the wiring diagrams, it seems that my swap car ('98 2.5RS) doesn't have the sensor like your '01.
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Old 02-11-2009, 11:22 PM   #10
EvenSteven
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No, i just checked that out too. The 98 RS also had the same exact signal and is also a three wires. You should be fine unless the sensor is not working. He probably didn't have the evap system connected right. There may be some differences in the evap system from 06 to 98 but i dont think it would be the pressure sensor. I think the pressure sensor was just leaving a code because the system had a leak somewhere. change the gas cap first.
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Old 02-12-2009, 12:00 AM   #11
MasterKwan
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I'm looking at the wiring diagram for the 02 WRX and 05 STI and there are missing parts. Worse though (at least for me) is that the pinouts for the wide white connector under the rear seat that goes to the fuel tank is different. The wires aren't plumbed to the same pins on the connector.

In my case this is a problem because I'm using the STI harness. This suggests I HAVE to switch the tank harness too or re-pin the connector. If I re-pin, I'll still probably get a CEL because of the missing solenoids so, it looks like the tanks comes out.

If you use the same front harness, it's not an issue.
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Old 02-12-2009, 12:36 AM   #12
EvenSteven
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The WRX will have a fuel controller where as the the RS doesn't. I forgot about that. I don't know enough about it to give you info but i know that you shouldn't have to drop the tank to wire in the controller. I saw a guy on ebay that is selling all the solenoids that you need so you are in luck with that one. Ill pm you.
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Old 02-12-2009, 02:08 PM   #13
nick42010
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This probably won't help much but I am in the middle of my 02 WRX swap into my 01 RS and they both have the same sensors on the tank, even all of the plugs are the same.
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