Reply to "Fuel Tank Cap (lockable)"

I think that IF you want the charcoal canister to remain connected and functional, then you need to use a vented filler cap and it needs to be connected to the engine intake manifold vacuum?

Look at the connection diagram. The venting of the tank is done by connecting the hose from the canister to the vacuum of the engine intake.

It is providing a negative pressure to the fuel tank itself.

It will be drawing fresh air in from the vent in the cap into the void in the fuel tank, then flowing the air bound vapors through the "tank vent mechanism" through the charcoal filter, then into the intake manifold.

First off, how much this effects the idle quality of the engine is suspect to me? Second, the engine sees this as a vacuum leak. It is effecting the air/fuel mixture strength to the engine.

My tank vent is not attached any longer to the intake manifold. It is just vented to the atmosphere like a vent cap would be.

Why would you WANT to use the emissions venting system if you did not have to? That was to satisfy US emission regulations for a manufacturer when the car was new.

Who is going to check you on that now? Contrary to other reports in the "Paranoid Press", Big Brother does not exist here in that sense of the term.