What does this line connect to? And what is it called?

I don't have a clear picture of this line before I took it all apart and now I have no idea what it connects to. Any help is appreciated!

 

That looks like an Evap system line. Might go back to the gastank.

Edit:
77740A HOSE, FUEL, NO.1(FOR CHARCOAL CANISTER)

 

Yeah thats an evap line, should go back and connect to the top of the gas tank where there are a couple sensor things and the fuel sending unit.

 

Actually, I think it just terminates there. I believe it allows the vapors to emit in the engine bay vs another part of the vehicle. I could be wrong on this because mine looks the exact same way. I looked at the FSM PDF and I do believe there used to be an 8" hose that comes off of that but just hangs or is clipped straight down so the vapors emit further down the engine bay almost underneath the vehicle, floor pan level.

 

If you look in the picture there are 3 lines coming from the back of the truck (gas tank) running along the driver side frame rail. In the picture, one of the lines is going to the fuel rail and the other two into the charcoal canister. The one that has nothing connected to it is the vapor vent line. It's supposed to just hang there. I believe from the factory there was an extended rubber hose but it just makes it so the vapor vents further down in the engine bay almost under the vehicle. I do NOT believe that is supposed to connect to any other part of the system. I had same question about mine a few years ago but all I could find is that is the vent for fuel vapor and it's supposed to be there. Possibly with just a little longer hose pointing straight down. Essentially, I think everything is as it should be. Maybe someone can correct me if I'm wrong.

 

Pardon me, I misspoke. One line from tank to fuel rail, one line is the return back to the tank, one line is the fuel vapor inlet to the charcoal canister and then the last, the 4th line is the one in question and that's the outlet of the charcoal canister after the fuel vapor has been "cleaned" and that's where it emits from at the very end of it's cycle.

 

I'm not sure any line emits to the atmosphere. The whole point of the system is to NOT emit vapors to the atmosphere.

 

Yeah looking at the diagram it just terminates with a extension, I have some hose so I think I'll add that. Thanks everyone!!

 

Nah, I think that's incorrect. I think the whole point is to "clean" the vapor emitted. For EPA standards... From what I have read and to my understanding this is how it should be.

 

Some vehicles I believe re-route the fuel vapor through the intake. Ours, that's what the charcoal canister is for.

 

You sound like more of an expert than myself.

 

Not an expert at all. I'm definitely an expert on research and cross referencing. I like to read.

 

Yeah I’m pretty sure ours route the fumes into the intake, I don’t think it should be venting to the air but I’ll check again

 

https://www.toyotaguru.us/tacoma-pickup-truck-repair/es-wdq.html

 

No codes being thrown? Feds/EPA knocking on your door?

 

You should download that PDF FSM floating around the internet. It's called the AIR DRAIN HOSE and does NOT go into the intake for the 3rd time. The charcoal is the filtering process.

 

Good lord. What is this? I'm dizzy!

 

The charcoal canister holds onto the fumes from the tank. When a certain volume/pressure is reached the purge valve actuates and sends these fumes into the intake for combustion. This is the way all evap emission systems have operated since they were required by the EPA sometime in the 90s IIRC. That link I posted is the schematic and description of the evap system in Tacoma’s. Pretty easy to follow and shows you how they work. There is a separate vacuum pump connected to a small filter that acts as the vent. This is DIFFERENT than purging the fumes into the intake and is only used during the OBD evap check or any other time the vacuum is checked by the ECM.

 

Regardless, the AIR DRAIN HOSE as the FSM calls it does NOT connect to the intake. What you found mentions nothing of the generation of Tacoma and has Celsius readings before F which leads me to believe it's European. I understand the point of you posting it to show us how the system works but I have a factory service manual and that purge or air drain as Toyota calls it does NOT connect to the intake.

 

Yeah...I didn’t deny that. I'll repeat myself and clarify again...All I said was that, all vehicles, in order to meet CAFE standards set by the EPA and emissions limits set by the EPA in the Clean Air Act of 1977, capture and burn gasoline vapors from the fuel tank. The charcoal canister does not absorb them and magically make them disappear like you said, and it does send them to intake contrary to what you said. The charcoal canister does capture the vapors and hold onto them until the sorbent material is saturated and can no longer hold more. The sorbent material does act to neutralize some of the HC (hydrocarbon) vapors, but it can only do so much. Once it is "full" the system does direct them into the intake to be reburned. The vent line does vent to the air, but it is in line with a smaller filter and a vacuum pump, this pump only runs when the ECM is running a vacuum test and is not a vent line where the gas vapors are just vented to atmosphere. You can find a diagram very similar to the one I sent in the FSM, after all, it's just a basic schematic.

*sidenote* I've seen people on here discuss removing evap systems, EGR systems, cats, etc.. because they think they cause more problems then they're worth and don't do much anyways. The reality is that most people don't really understand the function of these system and why they are there in the first place (EGR = reduce NOx emissions, evap system = reduce HC emissions and increase MPG). They are required by law in order to achieve better air quality for you and everyone around you. Not to mention if you get caught during an inspection or by selling a vehicle without these systems to someone there are very hefty fines. In California they probably send you to jail too lol. So when people start saying that the charcoal canister just vents to atmosphere, or the EGR can just be blocked off, or go ahead and delete the cats, I like to take a second and try to explain the importance of these systems a bit of the engineering behind how they work.