P0446 code

I just changed the charcoal canister today. The one I took out wasn't clogged I can blow air through with no resistance. I changed the purge solenoid, I changed the the vent valve the one right under the driver rear fender. I changed the gas cap. There was something today when I was changing the canister I had to drop the tank partially to get it out. There is an access hole in the trunk to get to the fuel pump. I had to disconnect the pump anyway laying right next to the canister was a hose not connected to anything. I followed that hose up to that access panel to the fuel pump and felt that the hose goes to something poking up next to the fuel pump. Maybe you will understand some of my wording is because I am a girl. That hose goes down and is about as long as to where the lines connect to the canister, but I connected my canister line back it doesn't belong there and I looked all over I don't see anything that it could possibly connect to. I don't know if it is supposed to be that way looking at the end of the hose it doesn't appear like it has been connected to anything. That's just my opinion I don't know. So what do you think of that? Thank you for answering my question. Robin

Hopefully you can understand my funky drawing.

Oh my gosh, I just spent forty five minutes drawing that and I cannot even read from the website. I hope there is a way you can make it bigger. Let me see if I can zoom up on it.

Are these bigger?

The part I am talking about from the pictures if I stick my hand down the trunk access hole and feel to the side of the top of the fuel pump, not the actual fuel pump but right next to it.
Is that the fuel pressure sensor? What ever that thing is, that's what the rubber hose connects to. I connected the three hard pinch lock connectors back to the fuel pump. So the fuel pump has its lines connected that's not what I am talking about. On the picture the red line is the hose that runs down and is just laying next to the canister not connected to anything. When I changed the canister I put back on the three lines to the canister two of those lines were pinch locking kind and the other hose the third one was the one that go's to the vent valve under the fender so its not a canister line. So I connected the canister back exactly as it was. This hose is separate and I followed the hose and it goes up to the top of the tank next to the fuel pump to what ever that thing is. I can feel through the access hole next to the fuel pump. Does the gas tank have two things coming out of it? The fuel pump and something else?

Let see if I understand what your saying when you say "It is probably just what you said"replying to my question "Is that the fuel pressure sensor? I am sorry if I am asking, because if I knew I wouldn't be asking. So if this is yes, your saying that the hose that doesn't go to anything that's connected to the pressure censer? That hose is there to suck air from the outside into the gas tank to allow for the movement of air for the vapor to be able to flow "via an opening, and routing it to the charcoal canister, via a hose, where it collects until the PCM wants to burn it in the engines combustion process. Because if there was not any air sucking in through the pressure censer from that hose the gas vapor wouldn't be able to flow through the system.

Quick question could when my gas tank fuel level gets under a half tank of gas it starts to fluctuate one minute I will be driving I will have half a tank and go a few stop signs and it will show empty. Then when I stop and park it will show full then empty, half and all aver never knowing how much gas is left in the tank have anything or tied to my p0446 code? I really hope you say yes because then that will mean I just need to change my fuel tank sending unit and hopefully my code will go away and I can get it smogged. The fuel pump works fine I drive the car daily I just got to make sure I have enough gas in it.