Tank Sizes and Petrol in a Diesel Mercedes Viano
Once you have put petrol in a diesel Mercedes Viano, the size of its fuel tank is one of the earliest points worth knowing, since it settles how much of the fuel in there is now petrol. Our page sets out the tank size on every version of the Mercedes Viano we hold data for, along with the engines it was offered with.
Regardless of what the number is, there is a single piece of advice after the event. As soon as you leave the motor off and ring Petrol in Diesel, we'll come out to drain the vehicle where it stands.
Each version in turn: Mercedes Viano fuel tank capacity
75 litres is what the fuel tank holds on each version of the Mercedes Viano we hold figures for, because they all use the same tank.
| Version | Fuel tank |
|---|---|
| Mercedes Viano 2.0 CDI 4-MATIC extralang | 75 litres |
| Mercedes Viano 2.0 CDI 4-MATIC kompakt | 75 litres |
| Mercedes Viano 2.0 CDI 4-MATIC lang | 75 litres |
| Mercedes Viano 2.0 CDI extralang | 75 litres |
| Mercedes Viano 2.0 CDI kompakt | 75 litres |
| Mercedes Viano 2.0 CDI lang | 75 litres |
| Mercedes Viano 2.2 CDI 4-MATIC extralang | 75 litres |
| Mercedes Viano 2.2 CDI 4-MATIC kompakt | 75 litres |
| Mercedes Viano 2.2 CDI 4-MATIC lang | 75 litres |
| Mercedes Viano 2.2 CDI extralang | 75 litres |
| Mercedes Viano 2.2 CDI kompakt | 75 litres |
| Mercedes Viano 2.2 CDI lang | 75 litres |
| Mercedes Viano 3.0 CDI extralang | 75 litres |
| Mercedes Viano 3.0 CDI kompakt | 75 litres |
| Mercedes Viano 3.0 CDI lang | 75 litres |
Does a little volume of wrong fuel in your Mercedes Viano matter?
Whatever diesel is already in your tank blends with the wrong fuel in your Mercedes Viano, and how full it was when you refuelled determines how much of the mix is petrol. How much petrol goes to the motor depends a lot on the amount in the tank. It takes up to 75 litres, and in a nearly full one a couple of litres stay a small part of the total, but in a tank running close to empty the same few litres make up a far greater share.
Often, drivers ask at what point the petrol becomes too much. Starting the engine is what carries that mixture out of your tank and through your pump and the injectors, so the more useful thing to find out is if it's run.
A drain is the safe option no matter what the share, and with a small amount it's normally all your Viano needs.
Which engines the diesel Viano was sold with
Your engine in your Viano is given in the version name on the badge. Read it before you phone.
Diesel versions of the Viano within our data have CDI badging.
The Viano 3.0 CDI extralang carries the largest engine at 3.0 litres, and the Viano 2.0 CDI kompakt the smallest one at 2.0 litres.
Call all the same if you are not certain which version you drive, and we will work it out with you.
What goes on with AdBlue in a diesel Mercedes Viano
With AdBlue, tank size plays out differently. AdBlue is mainly water and does not blend with diesel, so with AdBlue in a diesel Mercedes Viano, the diesel around it does nothing to dilute it. As it settles to the base of your tank, where the fuel pump draws from, even a tiny quantity reaches the fuel lines.
AdBlue gives the pump no lubrication and won't combust. Its water dries out as it sits, leaving urea that crystallises in your filter and the fuel lines, where it corrodes the metal it touches.
Certain diesel cars hold AdBlue in a separate tank with a dedicated filler, often beside the diesel one under the same fuel flap. Where your Viano has an AdBlue filler, the AdBlue cap is normally blue and takes a slimmer nozzle than the diesel one.
How a fuel drain on your Mercedes Viano works
Whatever size your tank is on your version, a fuel drain on your Mercedes Viano empties the lot, just where the vehicle is parked. We draw the contaminated fuel out, rinse the lines and your filter, and fill up again with fresh diesel ahead of re-priming the system and firing up your engine.
Parked at home or still at the pumps, your Viano receives the same job. You can drive it away after this drain is finished, and it'll be running on fresh diesel.
AdBlue removal from a diesel Mercedes Viano
With AdBlue lying at the base of the tank rather than mixed in, AdBlue removal from a diesel Mercedes Viano starts by draining your tank totally. Where the motor has been run, your lines and the fuel filter are cleaned through as well, and the filter is changed if needed.
What this covers is AdBlue that ended up in your diesel tank, not taking out or turning off the AdBlue system on the vehicle.
Pricing a fuel drain on the Mercedes Viano
We do not give a fixed price, since two call-outs on the same model can be very different. What affects it most is whether the Viano has been run or driven, and next how much was put in relative to the size of your tank, whether it was petrol or AdBlue, and where the vehicle is now.
With those facts, we can let you know what the job will involve when you phone.
Your tank queries on petrol in a diesel Mercedes Viano
What is the fuel tank capacity of the Mercedes Viano?
The same tank is used on every version in our figures, taking 75 litres.
Is petrol less of a worry in a bigger tank?
A larger tank means a few litres form less of the whole, yet the petrol is still there and still reaches your pump as soon as your engine runs. Keep your Viano switched off and draining it gets all of that petrol out.
How many versions of your diesel Viano are in your data?
There are 15 diesel Viano versions in our figures, and the name on your badge shows which row of the table above is yours.
Is it wrong fuel in my Mercedes Viano if it is not diesel?
Everything except diesel in the diesel tank, which means petrol of every type, super unleaded included, or AdBlue meant for its own dedicated tank.
Will you drain the Mercedes Viano where it is?
There's no need to move or start the vehicle. Whether it's parked on your drive or still on the station forecourt, we come to it.