I searched and couldn't find anything. I got the check gas cap the past 2 days and now have a check engine light for P0455 large evap system leak. Is there a known issue with the Bentley gas caps or any other issues with charcoal canister or rear evap lines? I just got finished doing the vacuum line replacement with brake lines. Just trying to see if anyone else has had a similar issue before throwing parts at it.

 

Smoke test right side(passenger US) 13mm/1/2in vac. line. Carefully undo factory check valve, leaving it attached to the rear of the intake manifold. The line to test should be independent of any sensors. Many forget to repace this larger line. This is the evap control line.

 

Thanks. Would it not show up from a smoke test from removing the factory pump line and smoking from there? like I did to find the cracked lines behind the steering rack?

 

No, Evap vacume is controled on the right side and is independent of the vac. pump. The other side is on vac pump for the brakes.

 

By the way :There is also an evap purge valve by the radiator overflow fill container. A visual check of this as well. The line going to the gas tank can crack, or the nipple on the purge valve breaks off.

 

Thanks for all of the help. Would smoke testing it here in this picture word for the evap side?

 

That's it.

My suspicion is, that pipe is crumbly since there's a rubber hose on it. What happens, handling it cracks at the metal junction behind the steering rack and pinion. Hope I'm wrong.

Keep us posted.

Unfortunately the online videos don't show this line and the other side line being repair in metal. I've done them with soft half-inch copper tubing. The trick is to fill the tube with sand pound the ends shut and do all the bending. This way you don't get crimping. Then cut the pounded ends off and blow out the tube diligently.

 

Thanks again. Do I need to cap anything off like I did on the intake in order to do the smoke test correctly?

 

You're good to go. No capping off.

 

Hey Dave,

I know this is an old thread, but did you ever clear your P0455? I have the same code in my 07 GTC.

Gary

 

The rubbers ends I used to connect the hardlines I used for the vacuum lines split and had to do it all over again. Definitely a vacuum leak.i used a smoke machine to find them all.

 

Where were those connections? I haven't started my inspection process yet

 

since yours is a 06+, they usually leak behind the steering column up on the firewall and again at the back of the intake.. it's not a fun task if that's where your vacuum leak is.

 

did you smoke test it from this vacuum line?