Honda fuel charcoal canister delete

[HondaFan81]

Found nothing on this forum with good information. I'd like to discuss this as I know people have done it, but what is the PROPER way. I am interested mainly to simply the engine bay and make room for other mods. I've done some research outside of this and the post below is the best article I've read so far from a CRX forum. I like it because it allows the fuel tank to breathe in and out, but keep the fuel in the tank in case of rollover.

Please discuss any other ideas.

[HondaFan81]

Quoted from a CRX forum member:

"First the environmental pitch. The charcoal canister serves an important environmental function by capturing and allowing the car to burn fuel that would vent to the atmosphere without the capture system. Burning this fuel results in an improvement in MPG but it's so small it would be very difficult to even measure. I'll take a guess at the typical car venting off between a quart and a gallon of fuel each year without the system. That may not sound like much but if every car on the road were venting that much we are talking super tankers full of gas being vented into the air each year. If you care about breathing clean air or live in an area that requires emission testing you should and may be required to maintain this system.

For the people who don't care about the above and insist on removing the fuel vapor recovery system here are some details about the system. Under the hood there is a charcoal canister and a purge cut-off solenoid valve. You would remove both of them and plug the vacuum line to the manifold. The vent line from the tank should remain open so the tank can vent. The amount of fumes is minimal so there is no real fire risk. If the rest of the fuel system is working properly this vent line is where air is drawn into the tank as you burn off fuel so you don't want to plug it. With the under the hood location there is little risk of drawing dirt or water into the tank but if removing the line and venting the tank under the car a filter or other means of keeping dirt and water out of this line would be a real good idea.

With or without the charcoal canister there are a couple parts of the fuel system that should be maintained in working order. They are the seal at the gas cap and the two way valve in the vent line. Both help with the evaporative emissions but more importantly will help keep the fuel in the tank during a rollover. That means they are both important safety equipment.

The fuel cap seal is pretty self explanatory. The two way valve is in the vent line near the tank, it remains closed until a small pressure is reached in either direction then opens up to vent."

[Granite CB7]

^That is very good info. I didn't really do anything special, I capped off the fitting on the t/b and used a small piece of the orig. vent line tubing as a turndown, so it's vented, but aiming down. Yeah, never, ever cap of the vent line.

[HondaFan81]

I did some online research on different methodologies and after following the fuel vapor line from tank to engine bay/charcoal canister, I found the easiest functional & cleanest way was to:

- Remove red hose from firewall metal fuel vapor line to charcoal canister, replace with longer red hose from canister to TB.
- Remove charcoal canister, leaving large drain hose in place.
- Route longer red hose from vapor metal line into/inside large canister drain hose, install hose clamp around it lightly snug not to collapse hose.
- Install vacuum caps on any open ports on the intake piping or intake manifold that remain.
- This is simple and retains canister drain hose that is nicely braced and has a neat baffle end-fitting that allows ventilation with some protection.
- This method also retains the stock 2-way valve that retains gas in liquid form in the gas tank, to prevent spillage in rollover accident.

[HondaFan81]

I created a DIY thread with my methodology on this, since none exist:

http://www.cb7tuner.com/vbb/showthre...81#post2164281

[bcjammerx]

so the only real benefit is cleaning up the engine bay?

Could you relocate the canister to a less visible place?

Or, just run a line instead of from the tank to the canister instead from the tank the to vacuums switching valve to the intake (the valve that is controlled by the ecu that controlls whether the canister has vacuum applied to it)?