Hello everyone 🤙 I just picked up my first Audi (S4 2.7tt) and I'm wholly unfamiliar with German engineering. I'm not a stranger to turning a wrench, but I need some guidance on getting this issue figured out.

My problem is the fuel tank has WAY too much pressure built up. The cap is ready to come off at all times lol. Whenever I go to fill the tank, it'll spit just about everything back at me after a couple seconds of filling. I've tried filling it incredibly slow (a couple cents at a time), or trying different angles to let air slip by. Nothing's working.

My first thought is a vent valve gave up or hose is clogged. Most information online pointed me towards the charcoal canister being the culprit. I can't for the life of me find a replacement anywhere reasonably close, and I haven't had any luck finding one online to order.

Can I clean these out? Is it worth bothering to try? I know a lot of people do an EVAP delete. I can do that if need be, but I'd prefer to keep this car close to stock if possible. I also don't have much time to work on it, so a smaller fix that works more like a bandaid would do me a world of good just to get it on the road.

Or am I looking at this the wrong way? Like I said, I'm unfamiliar with these systems and I generally drive 80s shitboxes so I'm fairly lost lol. Any help would be greatly appreciated!

Oh, I've also gone through and replaced my N80 as that's what was pulling a code, but that didn't make a difference in filling, just running. If y'all would like a video of what it's going I can make that happen. Sorry I didn't have one on hand for this post 😅

 

Fuel tank overpressure, help?