Can you find her magic button?

B6/7 S4/RS4
#1

No not that magic button.

And not the sport mode on the rs4

There’s a magic button that will allow you to get about 68-70 litres of fuel in the tank. Read about it on rs246 and was surprised I had never heard about it here. Fitting name of the guy who described it lol

[quote=PetrolDave ]I have to say I’m totally gobsmacked that the “where is this secret button?” question keeps getting asked here, it’s been discussed on here every few months for the last 6+ years :beerchug:

Open the fuel filler flap, remove the filler cap and look down into the tube. About an inch (2.5cm) down from the top on the inside of the tube at the rear of the car you’ll see a small 1/4" (6mm) black “button” - just push this downwards and it opens the vent pipe, which allows you to get the extra fuel into the tank.

So you fill the tank until the pump stops, then slide the filler nozzle up enough to get you finger onto the button, push and hold it down and then SLOWLY carry on filling - expect it to stop/start a few times, but I normally get an extra 5-7 litres in the tank doing this.
[/quote]

#2

Did not know about that. I guess the fuel consumption is such that the extra 5-7L might make the difference!

#3

I wonder how long it takes for the fuel to leak out of the charcoal canister. It only took four minutes for a newbie tech to do that by reconnecting the lines for the fuel filter incorrectly. That was funny as hell!

#4

Really? It’s not a secret button so you can add fuel. It’s there to accommodate for expansion.

#5

Just doesn’t seem worth the effort to me.

I also don’t understand why people push the limits of range. If I get down to where the light comes on, I am immediately finding a station. When I was in college, running out of gas wasn’t as much a concern as being able to afford gas, but now that I can afford gas… I typically don’t let the level go less than a quarter tank.

#6

Really

It’s odd because all the guys on rs246 do it. I always thought they were nuts with their range estimates or their biggest fill amounts. Now I know why.

#7

I never understood why people care about how many kms they can get on a tank. Unless you’re on a road trip or something I don’t think you’d be in many situations where you could use up a full tank of gas without a fill up opportunity.

The only reason I can think of is the convenience of not having to fill up for another 50km each time? Someone please enlighten me.

Also irks me when people ask me questions like “that thing must eat a lot of gas! How many kms do you get on a full tank?”. Like that has anything to do with comparing the fuel economy between different cars.

#8

^^ For us out of the GTA in the snow belts, it’s very much about snow squalls which can pop up a bit randomly. If you get into big localised snowfall out of the city, having extra fuel can make the difference between running out or not, especially when traffic has slowed to a crawl.

#9

Getting the most out of a tank is fun for some people. Just like dynoing your car is fun for others.

It’s all numbers, evaluating aspects of your car. I think you were wasting hours of your life as well as $100 of your dollars getting dynod. You don’t. Different strokes.

#10

http://www.youtube.com/watch?v=TuEdU_lrtZk ;D

#11

But why let the gas get so low in the first place? Especially in the winter.

#12

1/4 tank in 25 miles isn’t unheard of in snowstorm traffic

#13

It’s never deliberate. You could fill up in London, start driving East on the 401, get stuck in crawling traffic (20-30 kph) and be out of fuel in an S4/RS4 before the next open service station. A friend at work commutes from Woodstock to London, got caught in a random squall and took hours to get here - the main thing that kept him going was that he was in a TDI Jetta.

Anything else that’s got a V8 and is common on the road has an appropriately sized fuel tank rather than the paltry 55L we get. It’s actually 66L: http://www.audiworld.com/model/s4/04/s4avant.pdf

#14

ours is 62 litres, and the magic button makes it closer to 70

#15

Correction: Our’s is 66L. Still shit.

#16

Wouldn’t you be just filling the evap canister at that point? Eventually it will just piss out the over flow tube right? In some models if you fill the canister too many or a certain number of times it can cause a CEL. I’m pretty sure we’re talking about the same thing.

I just fill her up, pump clicks off I’m done. I usually try to fill up around the 1/4 tank mark.

#17

^^^I think that’s right, but apparently on our car it is retardedly large. Added to the tiny tank for such a fuel iinefficientficient motor and you can see why these guys are topping up.

If the practice were truly dangerous, I reckon those guys would not do it. They’re all engineers, and all love to chastise people for doing stupid stuff lol.

#18

Not sure if the RS4 is the same, but on the S4 it is a decent size and mounted in the hump of the spare tire wheel well. I’ve had the thought of deleting mine, cutting out the hump, welding in a flat piece, and mounting the nitrous bottle there for extra discreetness. I doubt I’ll do that though.

If you were concerned about ruining your charcol canister, it seems feasible to delete the canister and actually make/mount a small auxiliary tank in its place. Just thinking out loud.

#19

Evap systems are an emissions device that I would rather have. Unlike secondary air injection which is stupid.