Petrol in a Diesel Lancia Thema? Start With the Tank
Anyone who has put petrol in a diesel Lancia Thema needs to know the capacity of its fuel tank first, since that settles what share of what is in there is now petrol. Our page sets out the tank for each version of the Lancia Thema we keep data for, plus the motors it was sold with.
Whatever the size, the advice is unchanged now that it has occurred. Ring Petrol in Diesel with the motor kept off. We will come to you to drain the car right where it sits.
How every version stacks up on Lancia Thema fuel tank capacity
72 litres is what the fuel tank holds on every version of the Lancia Thema we have data for, as they all share the same fuel tank.
Wrong fuel in your Lancia Thema: what a few litres amounts to
How full the tank was when you refuelled decides the proportion of petrol, since wrong fuel in your Lancia Thema mixes with whatever diesel is still in it. When a couple of litres of petrol go into a tank sitting near empty, they form a far larger share of what your engine would take in. Added to an almost full tank of up to 72 litres, the same quantity is just a minor share of the whole.
Often, drivers ask at what point that petrol becomes too much. Whether the engine has run is the more useful point to check. Once it runs, the pump pulls the mixture from your tank and passes it on to the fuel injectors.
Whatever the share, the sensible course is to have it drained, and with a modest quantity a fuel drain is normally all your Thema needs.
Engines found in the diesel Thema
When you call, it helps to have read the badge first, as the name of the version on it shows us which motor your Thema has.
Diesel versions of the Thema within our data have Multijet badging.
Whatever version it is, the engine is 3.0 litres.
Once you ring, we can figure out which version it is together, even if you're not sure yourself.
AdBlue in a diesel Lancia Thema
AdBlue alters what the capacity of the tank means. The fuel pump draws its fuel from the base of the tank, and that's where AdBlue settles, and so even a small amount gets into the fuel line. If you have AdBlue in a diesel Lancia Thema, your diesel surrounding it doesn't weaken it, because AdBlue is mostly water and doesn't blend with diesel.
AdBlue does not burn and gives the pump no lubrication, and as its water evaporates, the urea left behind forms crystals in the lines and the fuel filter and attacks the metal next to it.
A second tank with its own filler carries the AdBlue on some diesel vehicles, commonly beside the filler for diesel under the same fuel flap. If your Thema has one, the AdBlue filler cap is usually blue and accepts a slimmer pump nozzle than diesel.
How a fuel drain on your Lancia Thema works
Done where your car is parked, a fuel drain on your Lancia Thema clears the entire tank, whatever size the tank is on your version. First the tainted fuel is pumped out, then the filter and fuel lines are cleaned. After filling up with fresh diesel, we prime the fuel system and start the motor.
It does not matter whether your Thema is still at the forecourt or parked on your drive. You can take it away after this drain is finished, and it'll be running on fresh diesel.
AdBlue removal from a diesel Lancia Thema
AdBlue removal from a diesel Lancia Thema begins with draining your tank fully, because AdBlue collects at the base instead of blending in. An engine that has been run means rinsing the fuel filter and lines through as well, plus replacing the fuel filter if needed.
AdBlue that has gone into the diesel tank is the topic here. Turning off or removing your car's AdBlue system is not part of that.
The cost of a fuel drain on the Lancia Thema
There's no fixed price published here, because call-outs on one model can differ quite a lot. How much was put in compared with the size of the tank, petrol or AdBlue, and the car's location all matter, yet whether the Thema has been driven or only started changes it most.
Those details are what we need to explain what the work involves. Phone with them to hand.
Queries on your tank and petrol in a diesel Lancia Thema
How many litres is the Lancia Thema fuel tank capacity?
The same tank is used on each version in our data, holding 72 litres.
With a larger tank, is petrol less of a problem?
A bigger tank means a couple of litres make up less of the whole, yet that petrol is still in there and still reaches the pump once your engine runs. A drain removes all of it as long as your Thema is switched off.
What counts as wrong fuel in my Lancia Thema?
Only diesel goes in your diesel tank. Petrol of every grade, super unleaded included, is wrong fuel, and so is AdBlue, which belongs in a tank of its own.
Do you come to the Lancia Thema to drain it?
There's no need to shift or start your car. Whether it's parked at home or still on the station forecourt, we come to it.