Well, I did some more research and decided to remove the evap canister (charcoal canister). The picture below vents the gasoline vapors into the intake manifold via this connector. The lines both connect to the IM, one by the throttle body and the other by the pcv valve connection. With EMS, these can be eliminated. I understand why removing this is a BAD IDEA. I am aware of most of the downsides, but I still want to figure out the best way to delete this. In other words what needs to be done with the 4 unhooked lines coming from the rear gas tank area that are now open after the canister was removed.

Canister and other elements removed from rear gas tank area


These are the lines that split and are venting into the intake manifold


The red line in this pic is what connects to the above picture


The red line returns into the gas tank area here, also the pink line. The blue hose is a bigger one that connects directly to the evap canister. All three lines are open and exposed now. Now what do i do with them?


The 4th line (yellow) seems to be coming out of the sub frame and is the largest hose.


So there are the 4 lines that are now open. I have alot of questions.

1) this is on an 05 return fuel system. The gas tank must be vented or excess pressure will build, correct?

2) where are the venting locations and are one of these 4 lines the vent?

3) with the evap canister the fumes are obviously returned into the intake manifold. So without the evap set up, how can I avoid the smell of gasoline by still filtering the fuel vapors?

4) how are fuel cell setups venting the vapors that are not running the OEM evap system???


Someone have a clue what I need to do. I know this is for race use only.

 

Bottom one I believe is evap

 

its a VSV vacuum switching valve (atleast thats what they are called on lexus at work). They are used for emissions. You can eliminate the whole evap system with EMS. There is no check engine lights with ems.

 

that piece is a solenoid that allows fuel that has evaporated from gas tank to be burnt through the engine. If you do pull that piece off, you have opened the gas tank to the atmosphere. Gasoline evaporates at room temperature and atmosphere.

 

so can I just seal the line that hooks into this piece and be done with it?

 

yeah you have to seal it off. there is more evap stuff in the rear of the car also you can eliminate.

 

does the gas tank NEED to be vented for any other reason other than emissions?... essentially with this eliminated the gas tank will become a sealed unit and fumes cannot escape right?

 

Isn't that right under the intake manifold? I went to pull it off one day and my tuner was like, you probably want to leave that on and plugged in because if not, gas fumes/vapors will leak into the engine compartment and that couild be a bad thing. I don't think it would be wise to cap it either as I believe the fuel tank needs to breath. I'd just leave it on if I were you. You can pull the whole EVAP canister system that is located under the driver side bumper just in front of the front tire. The canister, mounts and all the hoses under the hood can be removed and just cap the EGR valve port on the intake manifold.

 

yes, that is the thing that attaches underneath the intake manifold. As the EMS doesn't control the emissions anymore, that solenoid usually just stays shut. So it doesn't really do much of anything with a standalone system. If you've removed the emissions stuff nearer to the gas tank, then that valve doesn't go anywhere. For some reason on my car,that solenoid was open, or partially open, so everytime my car was filled up with fuel, the exhaust fumes were pushed into the intake and made it very hard for the car to start.

 

Oh ok, I didnt realize that valve would be shut if not activated by the ECU. No start problems with my AEM EMS so I guess mine is staying shut. LOL