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P0440 & Fuel Filler Neck
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TeenBeach
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PostPosted: Fri Jul 20, 2012 2:06 pm    Post subject: Question P0440 & Fuel Filler Neck Reply with quote

Ofcourse its that time for emission testing and I have the check engine light on! I had two codes... one for the cat which I fixed and then the evap fail/leak code. I could not find anything on the forum about the code even though I know there are threads on here. That damn search doesn't work for nothing!

Okay to the point... I know that the first place to start is to change the gas cap. Well I did buy a new one because I saw that the o-ring on the oe gap was cracked all the way around. While I was inspecting the area I noticed that there seems to be something wrong with the fuel filler neck. I don't know if I am crazy or if I am right, but isn't that little metal door inside supposed to be shut?





I looked to see how much a fuel filler neck is and I can get it for under 90. I am just wondering if this is something I can do myself? Is it just inserted into the fuel tank? I imagine there is a o-ring between the two. Thanks for all replys in advance!
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TeenBeach
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PostPosted: Sat Jul 21, 2012 8:10 am    Post subject:   Reply with quote

Anyone? I am going to wait till the pcm learns again to see if the gas cap works but if it doesn't then i am going to order this part.
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Frank
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PostPosted: Sat Jul 21, 2012 12:44 pm    Post subject:   Reply with quote

I don't believe that flap actually does anything besides making it slightly more difficult for someone to siphon gas from your tank.

Have you changed your PCV valve recently? I might be confusing codes here, but I think I had P0440 come up when I forgot to install an o-ring when replacing my PCV valve.

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TeenBeach
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PostPosted: Sat Jul 21, 2012 7:42 pm    Post subject:   Reply with quote

I was thinking that metal piece was to keep the fumes in, and that since its open its causing a leak? But I guess if a new gas cap is on, then it can't escape.

I want to believe the pcv is code p0420. I havn't changed the pcv but I might as well, can't hurt. Still waiting for a check engine light to pop up. *crosses fingers*
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PostPosted: Sat Jul 21, 2012 7:52 pm    Post subject:   Reply with quote

TeenBeach wrote:


I want to believe the pcv is code p0420. I havn't changed the pcv but I might as well, can't hurt. Still waiting for a check engine light to pop up. *crosses fingers*


That code is for you catalyst system.

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TeenBeach
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PostPosted: Sun Aug 26, 2012 4:03 pm    Post subject:   Reply with quote

Alittle update on this matter...

The code came back ofcourse after a few miles even with a new gas cap. I am running on temp plates right now because I can't pass emissions with this code. Anyone have any input on this matter? I don't want to take it to a shop to tell me.. I don't trust any shop except my own garage. Replys are always greatly appreciated!
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bigdog60
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PostPosted: Sun Aug 26, 2012 6:44 pm    Post subject:   Reply with quote

I'm a little confused Is it a PO440 or PO420?
I don't think a 440 code will come up on an Impala.
It's not in the factory manual.(2005 manual)
A 440 on something else is a EVAP problem .I had to replace the fuel tank pressure sensor on a Grand Am to get rid of the code.
A 420 code is a catalytic converter problem like someone already said.

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TeenBeach
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PostPosted: Mon Aug 27, 2012 1:35 am    Post subject:   Reply with quote

bigdog60 wrote:
I'm a little confused Is it a PO440 or PO420?
I don't think a 440 code will come up on an Impala.
It's not in the factory manual.(2005 manual)
A 440 on something else is a EVAP problem .I had to replace the fuel tank pressure sensor on a Grand Am to get rid of the code.
A 420 code is a catalytic converter problem like someone already said.


It is for sure cel p0440, I have double checked and wrote it down. I did also have the p0420 for the cat, but I fixed that with a o2 emulator.

http://www.obd-codes.com/p0440

This webpage seems to help, or atleast is leading me in a direction. I might take my car in tomorrow to get it smoke tested. Hopefully can find a solution soon...
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PostPosted: Fri Aug 31, 2012 12:27 pm    Post subject:   Reply with quote

do you have a problem filling up with gas, like you have to do it slowly?

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PostPosted: Fri Aug 31, 2012 12:48 pm    Post subject:   Reply with quote

TeenBeach wrote:
I don't want to take it to a shop to tell me.. I don't trust any shop except my own garage.


I hate to say it, but if you are already running temp tags because of the issue, it's time to take it to a shop.

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PostPosted: Fri Aug 31, 2012 4:27 pm    Post subject:   Reply with quote

On the 06+, there's no flap. Maybe yours isn't supposed to either. Even if you hasve a flap, it doesn't do anything. It's just to ground the nozzle. It doens't seal the neck or anything. What I would suspect, based on the experience I had with my 07, is some sort of EVAP check valve, which on mine is located aft of the left rear wheel in the side of the car hidden by the bumper cover. It's a common culprit on ours for evap related codes. Gives the same code as if the cap were missing And it's easy and cheap to replace. Maybe yours is similar to mine. I took it to the GM dealer and they found it crusted and jammed with dirty frozen slush. They cleaned it out. I only paid $35. They don't always rape you.
Or maybe yours is nothing like mine.

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PostPosted: Fri Aug 31, 2012 8:36 pm    Post subject:   Reply with quote

madbrad wrote:
On the 06+, there's no flap. Maybe yours isn't supposed to either. Even if you hasve a flap, it doesn't do anything. It's just to ground the nozzle. It doens't seal the neck or anything. What I would suspect, based on the experience I had with my 07, is some sort of EVAP check valve, which on mine is located aft of the left rear wheel in the side of the car hidden by the bumper cover. It's a common culprit on ours for evap related codes. Gives the same code as if the cap were missing And it's easy and cheap to replace. Maybe yours is similar to mine. I took it to the GM dealer and they found it crusted and jammed with dirty frozen slush. They cleaned it out. I only paid $35. They don't always rape you.
Or maybe yours is nothing like mine.

X2, and I will add my 2 Cents Mine threw a code as well, my check valve behind the rear tire and up by the fuel neck was the culprit like Brad's. I took mine out, cleaned it up a bit, sprayed a little WD40 in a few spots, used some wire and a spare car battery and energized it several times until it seemed to work good again. that was about 2 years ago now, and I didn't have another problem with it. Also make sure the metal lip of the filler neck where the cap gasket touches is clean clean clean. A bit of blackish buildup will keep from getting the cap a good seal. Best of luck. Keep us abreast. Peace, John

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PostPosted: Thu Sep 06, 2012 2:13 am    Post subject:   Reply with quote

Irish_alley wrote:
do you have a problem filling up with gas, like you have to do it slowly?


No, she still takes it like a champ! Laughing

IffyG wrote:
I hate to say it, but if you are already running temp tags because of the issue, it's time to take it to a shop.


and your right, so I did. Took her to a local shop, my dad knew the guy well, he is actually running for congress in milwaukee. Anyway, the guy seemed legit so I let him take the car for a couple hours. I came back and he basicly told me it was, with his experience, the charcoal canister. I'm thinking great, the worst outcome it could be. He didn't do a smoke test however. He said that also, when he has replaced the canister in other vehicles, the code still came back. So he basicly told me that he wasn't going to charge me for something that he can't help me with, in other words the examination was free. Wish there was more people like that!

So now I am in a tight spot... instead of trying this part over here.. and this rubber line there... I am going to step up to a nice good ol' Overkill PCM Very Happy Thinking that no matter what, its a win win.

Still waiting on an email from him with some questions, and I do know that he is busy.

jgilius wrote:
Also make sure the metal lip of the filler neck where the cap gasket touches is clean clean clean. A bit of blackish buildup will keep from getting the cap a good seal.


Will do this just for the sake of doing it! Thank you guys for your input and help so far!
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TeenBeach
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PostPosted: Tue Oct 30, 2012 12:38 pm    Post subject:   Reply with quote

If anyone is interested, I went over to 3800pro.com, hoping that they could help me solve the problem. This thread includes some first steps before getting to the fuel tank side of things



http://www.3800pro.com/forum/d.....p0440.html

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PostPosted: Tue Oct 30, 2012 4:25 pm    Post subject:   Reply with quote

No where did I read that you checked the Rear EVAP valve,or did I miss something?

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