AdBlue in the Diesel Tank in Cressex? Keep It Switched Off
With AdBlue in your diesel tank, your ignition stays off and so does the engine. Water with urea mixed in it: that's AdBlue. It doesn't burn, it does not mix with diesel, and the damage it does starts when your fuel system pulls it in. In Cressex, AdBlue in a diesel tank caught before your engine runs usually comes down to a drain and a thorough flush, just where the vehicle is. Before anything, ring us on 0333 366 0103.
Cressex, AdBlue in the diesel tank: what to do straight away
To do:
- Keys out — then nobody can switch anything on.
- Put your hazards on if you are anywhere close to moving traffic.
- The empty bottle or the till receipt tells us the fluid and the amount, so don't bin it out.
- Call us from where you are. A postcode starting HP12 3, or the name of the nearest street, gets the van to you without a search.
Do not do these:
- Not even for a second, and not to roll your vehicle: your motor stays off.
- Don't switch your ignition on. On plenty of diesels that alone runs the fuel pump.
- AdBlue does not dilute in diesel — it separates out — so adding more diesel will not weaken it.
- Never drive the car anywhere, not even a short way along York Way.
- Do not try to drain the vehicle yourself by the kerbside.
On a forecourt around Cressex, whether it's the Shell or another one, ask the attendants to help you push your car clear of the pump. At home, the vehicle stays exactly as it was left.
What does AdBlue do in a diesel tank?
AdBlue is made for the exhaust, not your motor. Its own reservoir holds it, and from there it is sprayed into the exhaust, and there it cleans the gas. Nothing in it is meant to pass through a fuel pump, and nothing in a fuel pump is built to handle it.
Inside a diesel tank it behaves really differently from fuel. It does not mix in. The intake takes fuel from the lowest part of your tank, and that is precisely where AdBlue ends up: as it is heavier than diesel, it sinks. When your pump runs, the AdBlue is first to be pulled through. Until then it waits beneath the diesel, which is how a car filled in Clayhill yesterday and not started stays the simple one, provided no one turns the key.
After it is pulled in, the damage comes in two forms. As its water goes, the urea left behind crystallises, and the crystals block filters and settle in fine passages. And it's corrosive to some of the metals a fuel system is made from, so it keeps labouring on the components it reaches for as long as it remains there. Overnight, a vehicle parked around Cressex with AdBlue in its lines gets worse; where it's only inside the tank, nothing changes. And there is the water: it offers no lubrication to the parts that need it most — the high-pressure pump and each injector.
Why is AdBlue in a diesel regularly the bigger issue?
Fill a diesel with petrol in error over at the Esso, and this issue is diluted fuel. Damage just comes from running on it. Blended into the diesel and left inside your tank, it does nothing.
AdBlue in a diesel is a fault of the wrong substance altogether. Not burning, it can't just be run through. Nor can it be thinned, since it splits again — and the next tankful won't clear away deposits or corrosion. So the flush counts more here, and trying the engine "to see", in the heart of Cressex or out in Towerage, costs more than almost any other slip.
The same good news applies as with petrol. If your motor has not run, the AdBlue is still in the tank, and the tank is the simplest part of a fuel system to clear, wherever around Buckinghamshire your car is sitting.
Cressex: how AdBlue ends up in a diesel tank
After dark, two caps together — the AdBlue one and the diesel one, occasionally behind a single flap — may look the same. Nobody means it; plenty of layouts invite it. A bottle bought when driving home and tipped in outside the house, instead of at the filling station, is the usual story.
The ways it takes place are few and familiar. The refill is rushed outside Chepping View Primary Academy, because your dash lit up with a warning while the children were dropped off. A bottle is poured in at the end of the day on a drive just off Verney Avenue. Or a driver new to that flap refills the vehicle after dark, parked in the car park outside The Squirrel.
The least known cars see it most — rentals, brand-new ones, fleet ones, and the spare car in a home with one of each fuels. Same mistake, an identical first step — leave it off — anywhere you happen to be around Cressex or the rest of Buckinghamshire.
AdBlue in the diesel tank around Cressex, and the motor started?
If so, the AdBlue is no longer in your tank. With any running time, it travels to the injection pump and every injector, after passing via your filter and lines.
You may notice your motor running roughly, smoking, losing power, showing warning lights or cutting out, perhaps on the way back from Chairborough Local Nature Reserve or halfway across Cressex. Pull over when safe. Switch off. Keep it off rather than testing it again. More of that is pulled through with each start.
On the M40, under a mile from Cressex, the next junction is where to leave, and anywhere sensible is where to park — not driving on.
How far it went matters. A few hundred yards across Cressex to the car park by Castlefield Community Centre is a very different job from a run towards St Albans, under 25 miles away, with the AdBlue reaching further into the system with each mile. Tell us about how far it had come.
There is more to clean out once your engine has been started, and our technicians do all of it where your car has come to a stop. Lasting damage is very uncommon when it's caught soon.
Cressex: how AdBlue is drained from a diesel
A street by Cherith Christian Fellowship, a driveway, a lay-by or a forecourt: anywhere the car has stopped around Cressex, our engineers travel to it. Before anything else our technicians ask what got in, about how much, and if your engine has been run, because those answers determine this work.
Right there, the tank is then drained, and all of the contaminated diesel and the urea come out at once. A full flush matters much more with AdBlue than with petrol, since what remains will not wash away by itself. Next, the filter: cleaned, or replaced when it must be. Then fresh diesel, then a test of your car. Engine not run? In that case expect about half an hour on site for most jobs. Explosion-proof pumps make a live forecourt sensible to work on, and they're quiet enough not to disturb the street at night.
The final step is to bleed the system on fresh diesel. Firing it up comes next, and then you set off from where the car is parked, by High Wycombe or on a drive around Cressex. Before we go, our technicians make sure it's running correctly with new diesel in. The whole job is done where the vehicle is, so it never needs to go to a workshop. Your insurer is likely to want an engineer's report and the VAT invoice — both yours afterwards.
About Cressex
Cressex is a suburban area in Buckinghamshire, situated inland at an elevation of around 152 metres, with semi-detached housing being the predominant type of accommodation. Cressex lies approximately 28.8 miles west of London and is close to nearby places such as Booker, Sands, and High Wycombe. Cressex is also near the city of St Albans, which is about 20.7 miles away. Cressex has a population of around 4344 residents.
AdBlue drains across Cressex and Buckinghamshire
AdBlue call-outs in Cressex are passed to vans that cover the places around it — Booker, Sands plus High Wycombe — and much of Buckinghamshire further out, throughout HP postcodes. Guessing doesn't help close to a county line or somewhere tricky to pin down; ring and check.
Wherever your car sits — a driveway at home, a side street, a parking area, a forecourt — we empty it there, and there's no need to take it to us; that suits Cressex, a residential suburb, well.
AdBlue in a diesel tank around Cressex: the cost of fixing it
There's no honest single quote, since the jobs are not the same. Whether your engine has run, and for how long, comes first in what shifts the price. How much AdBlue was put in comes next, and then the location of the car, since an open drive is easier for a van to get to safely than a tight spot behind High Wycombe Omniplex.
Ahead of a quote, not after, each call from Cressex begins with the same three checks: the fuel, the amount, plus if the engine ran. Given those replies, a range narrows to one fixed number.
The price is quoted during the call, before a van sets off; payment happens on the day, by card or by phone, with nothing upfront. Misfuelling cover comes with plenty of insurance policies, so it pays to look at yours before the van arrives.
Cressex: still next to the vehicle?
Leaving your vehicle alone is, then, the most useful thing open to you. Keys out, engine off, ignition off. Phone 0333 366 0103: AdBlue, the amount, and whether it ran is all we ask. Petrol in Diesel takes over the rest across Buckinghamshire, Cressex included.