Sucking out ad blue with a vacuum?

[Cogcog]

I have overfilled my ad blue tank and it has thrown a fault on the EMS as the ad blue tank level cannot be read. I am on the 492 mile coundown to the engine not starting.


I have tried to siphon out the excess but the tankpossibly has some sort of siphon prevention device from getting a pipe down the neck into the tank.

Videos on the net suggest the dealer can pump it out but how do they do it? Video doesnt show exactly how they do it.


Question: would a vaccum pump be capable of extracting the excess ad blue? I see they sell manual and 12v vacum pumps that claim to remove oil and other fluids.

Worth a try with a vaccum pump as they do seen to have different sized pipes https://www.onbuy.com/gb/7l-extractor-pump-manual-...

[Cogcog]

I cant get my head around how a vaccum could suck up a liquid when the pipe cant reach the liquid level.

[Matt_E_Mulsion]

Can you not disconnect a pipe anywhere and let some flow out, hence dropping the level in the tank?

[Getragdogleg]

Drive it round and the level ought to drop, hopefully the stupid thing might be able to read the level then.

[Monkeylegend]

I would not be surprised if it still continues the countdown even if you do take some out, probably has some system whereby it has to be reset by the Mfg.

Is it a Mercedes?

Has the car actually told you that it is overfilled or are you thinking/hoping that's what has caused the countdown?

[MethylatedSpirit]

Shove a tube in, suck until the liquid (almost) reaches you and then place the end of the tube lower than the body of liquid you wish to empty.

Also, how do you overfill adblue?

[ChevronB19]

MethylatedSpirit said:

Shove a tube in, suck until the liquid (almost) reaches you and then place the end of the tube lower than the body of liquid you wish to empty.

Appropriate user name. It never works, you *always* get some of the liquid in your mouth, and given what adblue essentially is, I *do not* want that in my mouth…

(Also note op comment about siphon prevention device)

[MethylatedSpirit]

Just leave the cap off and drive fast round a corner then

[Matt_E_Mulsion]

Monkeylegend said:

I would not be surprised if it still continues the countdown even if you do take some out, probably has some system whereby it has to be reset by the Mfg.

Amazing isn't it - we've had fuel tanks and gauges for donkeys years which when they are full, generally the needle stays right at the top and drops as the liquid is used.

But let's introduce a different system on the AdBlue where by if you fill it to the top, it requires dealer attention to reset the system. Call me cynical, but it almost seems like an engineered 'fault'.

[shakindog]

Depending on the car make all depends on if it will sort itself out.
If vw they use an ultra sonic sensor in the top of the tank I believe overfilling causes this sensor to throw a wobbler and will need dealers to recalibrate and sort it.
Peugeot Citroen and such driving it for a bit should eventually make it think long and hard about it then play ball and reset.
If not any halfway decent garage should have the gear and software to recalibrate and tell it to stop being a moron.

It’s an absolute crap system on most cars but got to save the swamp donkeys.
My very transporter gets ignored till it says 300 miles then gets 10 litre and is fine.
I used to fill it at 1000 mile warning but that caused the above issue and a visit to the dealers to sort

[hellorent]

Son's mate overfilled his merc with adblue, the system said it needed to be sorted within 27 miles, I told him to run it for about 10/15 mins at 2000/2500 rpm & see what happens, he done that then switched it on/off, all ok maybe worth a try of that.

[Ivan stewart]

Funny how it’s something German again !!
Everything we have with adblue you just slop it in and rinse any spillage or overflow with a hose ,

[stevemcs]

If its a Merc sometimes its an issue with the NOX sensor, If its a JLR car sometimes its wiring.

[Dashnine]

ChevronB19 said:

MethylatedSpirit said:

Shove a tube in, suck until the liquid (almost) reaches you and then place the end of the tube lower than the body of liquid you wish to empty.

Appropriate user name. It never works, you *always* get some of the liquid in your mouth, and given what adblue essentially is, I *do not* want that in my mouth…

(Also note op comment about siphon prevention device)

It’s chemical urea, not actual urine.

Does the tank not have a drain plug at its lowest point?

[fttm]

For reference , when filling make sure the motor is off and the pump has stopped otherwise you will overfill and all sorts of codes will show ,

[thankyouhellorent]

hellorent said:

Son's mate overfilled his merc with adblue, the system said it needed to be sorted within 27 miles, I told him to run it for about 10/15 mins at 2000/2500 rpm & see what happens, he done that then switched it on/off, all ok maybe worth a try of that.

I don't know who you are, where you're from or what kind of genius you are. Just made an account to say thank you for this tip. I had overfilled adblue on my 2017 VW Caddy, and eventually it was down to 20km before I started Googling and testing different tips before I came across your tip.

I probably did 30 minutes at around 2k rpm just to make sure, then shut down the car. Once I turned it on again and started driving, it displayed full after a km or so of driving.

So to whoever who has issued with overfilled adblue; try hellorents tip and give him a big digital hug.

Edited by thankyouhellorent on Wednesday 7th May 13:29

[richhead]

How have we got to the point where overfilling a tank of an additive stops the car working, madness

[Prisoner 24601]

thankyouhellorent said:

hellorent said:

Son's mate overfilled his merc with adblue, the system said it needed to be sorted within 27 miles, I told him to run it for about 10/15 mins at 2000/2500 rpm & see what happens, he done that then switched it on/off, all ok maybe worth a try of that.

I don't know who you are, where you're from or what kind of genius you are. Just made an account to say thank you for this tip. I had overfilled adblue on my 2017 VW Caddy, and eventually it was down to 20km before I started Googling and testing different tips before I came across your tip.

I probably did 30 minutes at around 2k rpm just to make sure, then shut down the car. Once I turned it on again and started driving, it displayed full after a km or so of driving.

So to whoever who has issued with overfilled adblue; try hellorents tip and give him a big digital hug.

Edited by thankyouhellorent on Wednesday 7th May 13:29

Hi gents - when you say 'run it' do you mean keep your foot on the accellerator for 10-15 mins whilst the car is in neutral in your driveway?