r/E46M3

When I first bought my 2004 E46 M3 with 150K miles, the first time I filled it up I could smell fuel inside the car. I asked the previous owner and he said "oh yea, I only fill it up half way to 3/4" to avoid that. Okay, well - I'd like to not have that on a full tank. So I replaced the fuel pump and sender seals which honestly weren't really that bad. After that, with a full tank I didn't smell fuel inside the car anymore, but I could smell it outside, but no leaking or dripping that I could tell. I didn't think too much of it, figured I'd get to it at some point. Today I fill up on the way to work, and I make a stop on my way home and the parking spot is on pretty uneven ground - the rear driver side is the lowest part of the car. When I come back out to the car, I've got a HUGE puddle of fuel under the car and it's just spewing out fast enough for me to be pissed at the amount with gas at 4 bucks a gallon. It was coming out right near or somewhat behind the rear passenger wheel.

The previous owner had the rear subframe supports welded in, which if I understand require the fuel tank to come out? Or if there's just a leaky hose somewhere, or maybe this is a common failure? Anybody have any insight on things I can check without having to drop the entire fuel tank to find out where it's coming from?

PFA

https://preview.redd.it/31e5a29b0d2h1.jpg?width=4000&format=pjpg&auto=webp&s=c65a51fa9e792241cb33aa76cc9d721703976ad3

I don’t see a lot of comparisons but the Eventuri hybrid setups seems so DIY friendly especially with no tune.

What’s the opinion here ? If the budget was 3000$ does it makes sense to pull the this trigger ? Is the induction sound worse on the hybrid vs the csl airbox with a tune ?

I have a 2001 M3 so a MSS54 DME.

If I run an Airbox without the flap can I easily Flash the car back to a Stock Airbox State if I were to sell it ?

I’m considering the Karbonius Airbox without the CSL flap. This cost the same as the eventuri hybrid box currently , actually 100 euros cheaper new and about 1000 cheaper if I get a used Karbonius Airbox.

Just wondering how easy it is to go back to stock with the ECU.

Is anyone else concerned about the rising ethanol content? I was wondering if anyone was upgrading their fuel system to handle running and storing higher ethanol? I love my M so I’m trying to keep it around and running as long as possible.

title basically says it. Any recommendations for cheap, somewhat reliable and quality front splitter/lip for my M3. I am thinking under 200 bucks preferably. The whole thing is just to cover a crack on the bumper cover.

Car has been down for going on a month so I haven’t been to the pumps in a while and the gas in it currently is standard E10 from before they bumped it, but it should be fixed beginning of next week. Wanted to ask now in case I need to figure out a complicated workaround or pay out of every orifice for E0.

Did a little research, and apparently BMW says “nein!!” to E15 for these cars but I haven’t seen anything in the forums complaining about problems. That being said, I’ve spent 30+ days alternately bleeding/crying/sweating in this car (including replacing the fuel pump and sender), and I don’t want to finally button it up just to immediately have problems because there’s extra corn mixed in with the liquid dinosaurs.