I was able to unclog the line on the tank by squeezing it all over with pliers to break up the charcoal and it finally blew out, 150 PSI wasn’t enough to get the job done. Unfortunately the metal hard line is also completely clogged so I had to order a new one and no one local had one. I put the tank back together and back in and left the purge line disconnected so I didn’t risk any charcoal getting back in the lines on/in the tank (even though it shouldn’t as the purge line should only be pulling away from the tank to the engine). I’m going to go ahead and replace the purge valve even though it doesn’t look like there is any charcoal in it just so everything will be new and I shouldn’t have to worry about this again.
Changed entire evap system, but can't blow out line from engine bay
- Thread starter Bama704
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
Did that solve your issue?
OP
OP
Bama704
TYF Newbie
I changed lines and still have the check engine light on. Also have the tighten gas cap message after replacing with new cap.
mountie
Supporting Member
Well, well...... You made me save some money ( gas cap message)....... Maybe now, I believe the venting problem is just a design fault in the system. ( Not everyone gets the problem, that may not get fixed, if you have the message?)
(FYI..... The 3rd new gas cap I replaced to stop the message was a dealer ACDelco cap, and still the message)
There are many places that the evap system can leak. Although smoke tests aren't always conclusive, one helped me find a leaking fuel pump gasket that was only two years old. Rare, yes, but possible. One thing to check are all the hose clamps along the filler tube. Filler tubes can rot. A smoke test would probably show that.
In case it helps anyone, I had the clog to between canister and purge valve, and was able to clear it. Berryman B-12 Chemtool does dissolve the charcoal pellets, not completely, but with an overnight soak it does act on them long enough to start working the pellets free. I was able to then blow from each end of the line to get it clear. I have a 2012 suburban, but same basic design I think. There is a connector about halfway up the vehicle, right at the front of the gas tank. I was able to determine which half my clog was in by separating and checking each segment. Unfortunately, my clog was somewhere in the hard lines under the engine. I had very slow air flow, but could hear it escaping the other side when blowing into it with about 120 psi. Plugged the bottom, sprayed the B-12 in the top until full, plugged the top, let it sit. Next day, I thought I had made it worse because I couldn't get much of the liquid out. Seemed almost completely clogged. I just kept at it switching the ends I would blow into. I'd hear a little gurgling on the other side as a little bit of liquid came out. Eventually, it started to free up a bit and I could tell I had at least gotten the liquid out but airflow was lower than before. I kept going. Eventually I could hear a shifting clog as I kept switching ends to blow into. Each blow, I could hear it move more, and I was getting lots of charcoal dust out the front engine side, a testament to the breakdown of the pellets from the B-12 soak. Finally, the last bit blew out.
Similar threads
