evap solenoid on intake manifold?

I just got my new intake (without EGR hole), and am starting to do my fuel rail mockup. Is everyone here still running that ugly solenoid on the top? Can I remove it? Is it JUST for emissions, or does it have a useful purpose. How did everyone fill the hole?


(talking about the one on the passenger side of throttle body, with the 2 big hoses running off that hook up near fuel line)

It pulls the fuel vapors out of the vapor canister at the fuel tank. Without it who knows what would happen to the fuel in that tank, possibly overflow or explode? If you get rid of the noid you should probably remove the cannister and disable the codes in the tune.

the solenoid the controls fuel tank is on the engine?.... seems like a lot of unnecessary lines ran. But I guess it's staying :(

When the temp outside goes up, so does the temp inside the gas tank, that means the vapors inside pressure up. That solenoid sort of regulates the pressure by opening up to the intake.

I realize what it does...just dont see why it's THERE. What do guys with fuel cells use? / Why wasn't this a problem with old school vehicles.


I should be able to just relocate it correct? I was going to run a vaccum hose and put it on the back firewall somewhere.

Well homie you asked what its useful purpose was and I answered! Good Luck!

i meant useful purpse of being the eyesore of the intake. Guess I should have worded it better. Thanks for help. I'm going to thread the hole it pushed into, and put a elbow fitting, then run a hose down the intake, and mount it on the back somewhere. That way it'll still be hooked up, just not real visible.

Ok I gotcha. It does stick out like a sore thumb huh.

Old school stuff didn't have that problem because they had vented gas tanks, usually on the cap.
The EVAP system is mainly emissions related in purpose. Around 20% of hydrocarbon emissions from a vehicle are from evaporation.
You can remove it cap the line and add a vented gas cap, but you will fail any emissions tests that require a completed EVAP systems test in the OBDII.