I am trying to remove my evap system, pretty much took out everything. Only thing left is the vent on top of the gas tank. I was wondering if I should just block it, or I have to run a hose face up, possibly with a filter on top of it?

 

Fuel tank will build up vapors pressure inside it, even when parked. So if you plug it, you'll have a pressurized fuel tank. If you put a filter on it, you'll have a garage full of poisonous/toxic/FLAMMABLE fumes. The canister under the tank stores these bad fumes, then when you start the car, a valve opens, and vacuum in the intake manifold sucks them in.

 

Bumping this to see if there is any way of removing the solenoids and vacuum lines that run from the manifold down to the denso-evap solenoid and back toward the gas tank. I have full EMS with no emissions but I don't want to remove anything if it is necessary for fuel delivery. Thanks in advance.

 

You can't remove that system...it's essential to engine operation.

 

I have most of it removed from my car. I plugged all port on the vent (4) and I could not even put gas in the car. next, I installed the two hoses that go to the fuel filler neck. Now the car operates find.

I know I still need a pressure vent and a Intake vent. But I have not taken the time to figure out what I need.

 

What part of engine operation is this evap system essential to on a track only full EMS vehicle??

 

I can tell you your car will stumble without this being properly in place. As me how i know. Under normal partial throttle, now symptoms. Under WOT, you will not like what you get on track. I'm going through right now. Now sure if I mangled something or what, but coming off track, there was a loud hissing sound coming from the tank area. Opening the gas cap released all pressure and the hissing stopped immediately.

Found this thread whilst searching for possible easy remedies.

 

If your car has a AEM, you may want to consider this.

The EVAP canister is designed to capture and store fuel vapor, even when refueling. Since the canister is never purged with the AEM, it becomes saturated with fuel. 1 car that had a AEM for 7 years actually had fuel dripping from the canister.

 

Chris, I used to run AEM EMS with the sc'er and then stroker. All my fuel delivery problems started after reinstalling a stock motor and stock ecu. Correlation perhaps?

 

Entirely possible. Look at the EVAP canister, I bet there is a wet spot between the canister vent shut valve and the canister.

Ever smell gas when refueling? it's coming from the canister that can't store any more fuel vapor.