P0455 Evaporative Emission Control System Leak Detected (gro

[KEWROCK]

So to rehash. Check two valves, one in front by the cooling fan(round or square with two hoses, one to intake and the other heading rear), and second valve on top of tank along with the canister also in the rear.

I also read in another thread a few months ago about a J hose prone to cracking? That was also under the rear canister too right?

[jblackburn]

The J-hose is the most common cause of the EVAP code being thrown for no apparent reason, but I doubt a crack in the hose there would actually keep you from filling up the tank.

In your case, I'd start with the hoses & the canister itself. If they don't appear plugged, it may be one of the valves.

[Joe Hurless]

Woah woah woah everyone just slow down. Gross leak in my timezone is 99% of the time a loose gas cap. I have walked out of the shop countless times with the OBD2, pulled that code, and seated the gas cap properly (which humiliates the customer, but saves them a lot of time and money), and that ends up being that. The J hose is a viable culprit, but is rarely the problem.

Clear the code, secure your gas cap (or replace it if its messed up), and see if that fixes it. And from now on take an extra second to make sure your cap is secured when you fill the tank.

[Joe Hurless]

I hate to double post, but I wanted t add a little to what I posted. So I was just thinking... do you have an OBD2 tool? If you do, go reset the light and take full control of the car for a week. You said you replaced the gas cap, then make sure it's secure and drive the car for a week and see if the light comes on. A lot of times we have women come in with check engine lights on their husbands cars because they didn't secure the gas cap properly. Maybe your wife is the culprit?

[mrreilly]

It's not the gas cap I'm sure of that. I make sure every time that it's on properly.
I just replaced the vacuum lines but that didn't do anything.
I'm going to order the purge valve next.

[mrreilly]

I just put the new Purge Valve in but the code still came up. I did clear the code to see what will happen though. If this doesn't work what should I do next? I'm afraid I might just have to have a shop look at this...
I also sprayed some throttle body cleaner around to see if any vacuum lines had a leak but that did nothing.

[Volvo_240_Atari_2600]

OK...
I have a question that I feel relates to the topic.

My wife's 98 v70 N/A has the same code (ALLWAYS)
I reset it with my OBD 2 reader and eventually it comes back.

I have not had the time or desire to get so involved with those lines to figure out where the possible leak is, but one thing I have not seen anyone mention on the boards with the EVAP leak is an aftermarket locking gas cap?

I guess I can try to locate a used OEM gas cap to test this out, but when we got her the car, the price of gas was up the roof and she used to drive a gas guzzling GMC Safari and being that I think ahead of gas thieves, I was quick to replace the OEM gas cap with a STANDT locking gas cap. Wouldn't there be a chance of a leak from that?

Any thoughts?

As far as I can recall when I got the car, the CEL was on and the reading I got before replacing the gas cap was a P0305 and from memory ever since the early days of ownership of this car, this is the only code that seems to repeat itself everytime I reset it.

Eric

[cleaverc]

I have been having the same code for quite a while. It started out as a "Small Leak" but now is the "Gross Leak". When I clear the code, it usually takes 4-5 days to come back, so I think it is a small leak that take a few days to activate the code. Can I narrow down the possibilities based on how long it takes to come on? I've checked the gas cap and it seems to be in good shape (no nicks). Any pictures available of the various components? On a side note, I need a good reference source for working on my V70 - any suggestions?

Thanks for any help.

Chris

[Ozark Lee]

Welcome to MVS Chris,

Most of the time it comes down to a cracked line in the EVAP system. It is tedious but you need to methodically check each line going in and out of the charcoal cannister. They tend to break the most at the elbows. Some are real easy to get to and fix and then there are others on the top of the gas tank that are real though.

...Lee

[mrreilly]

Well, good news! I cleared the code and I went up and got an e-check and it passed! So I don't need to worry quite as much about having to get this code to go away within a week. When I've got time I'm going to try and figure everything out, but for now I'm not too worried about it.
Thanks for everyones help!

Mike