AdBlue in the Diesel Tank in Towpath? Keep It Switched Off
If AdBlue has gone into your diesel tank, keep your engine off then leave your ignition off. Urea dissolved in water is all AdBlue is. It doesn't burn, it does not mix with diesel, and the damage it does starts when the fuel system draws it in. In Towpath, AdBlue in a diesel tank found before your engine runs normally means a drain and a thorough flush, right where the car is. Before you do anything else, call 0333 366 0103.
Your next steps right now, Towpath: AdBlue in the diesel tank
Do:
- So nobody can turn the ignition on, pull your keys out.
- Hazards on, if moving traffic is anywhere close.
- So you can give us which liquid it was and about how much, save your receipt or the empty bottle.
- Give us a postcode starting TW17 9, or whichever street is closest, and the van finds you straight — so ring wherever you stand.
Things not to do:
- No starting the engine — not briefly, not to reposition your vehicle.
- Switching your key to ignition alone sets the pump going on plenty of diesels. Avoid it.
- Don't top up with diesel to thin it. AdBlue doesn't mix in diesel; it separates out.
- Do not drive the vehicle anywhere, not even a short stretch down Reed Place.
- No emptying it yourself, either, at the roadside.
On a forecourt in Towpath, whether it's the Shell or another one, ask the staff to help you push your car clear of the petrol pump. If you are on your own drive, leave the car just where it stands.
AdBlue in a diesel tank: what it does
Not the motor but your exhaust is where AdBlue belongs. Stored in a separate tank, it's squirted into the exhaust to treat the fumes. A fuel pump isn't designed to take it, and AdBlue was never supposed to go through one.
It doesn't blend. Once it is tipped into a tank of diesel, AdBlue behaves nothing like diesel. Heavier than diesel, it drops and pools below it — the same place the pickup draws from. Easiest of all: one that got AdBlue in Lock Island overnight and hasn't turned since. The AdBlue sits at the foot of your tank, undrawn — though it would be first through if your motor starts, ahead of any diesel at all.
From there it does two kinds of damage. It attacks certain metals found in fuel components, attacking whatever it touches until it's removed completely. And once the water evaporates, the urea turns into crystals that block filters and lodge in narrow passages. Lines holding AdBlue mean damage by morning for a car parked around Towpath. Only in that tank, it stays stable. And there's the water: it brings no lubrication to the parts that rely on it the most — the injection pump and every injector.
Why AdBlue in a diesel is regularly more serious than petrol
Fill a diesel with petrol in error at the BP, and this issue is thinned fuel. Mixed through your diesel and sitting unused, it's harmless at that stage; running your engine does the damage.
AdBlue in a diesel is a problem of the wrong substance altogether. It cannot just be run through, because it does not burn. Whether your car is in Chertsey Meads or the heart of Towpath, turning it over "to see" does more harm with AdBlue than almost any other slip, and the flush matters more. Why: it will not remain mixed, and so watering it down is impossible; and crystals and corrosion survive the next tankful.
The same good news applies as with petrol. Anywhere around Surrey the vehicle has come to rest, an unrun motor means the AdBlue still in the tank: the easiest part of any fuel system to empty.
AdBlue in a diesel tank in Towpath: how it ends up there
Nobody means to do it. The AdBlue filler on many cars sits right next to the diesel filler, sometimes under the same flap, and the two caps can look alike in poor light. Mostly it takes place with a bottle bought on the way home and poured in on the driveway, not at the pump.
Usually, it happens in one of a few familiar ways. The top-up gets hurried outside St Charles Borromeo Catholic Primary School, Weybridge, after the dash flashed with a warning as the children were dropped in. Someone pours the bottle in outside their house, just off Towpath, as the day ends. Or someone unfamiliar with that flap refills the vehicle after dark, parked in the car park outside Thames Court.
It crops up the most in a rental, a brand-new car, a fleet motor, or the spare car in a home with one of each fuel types — the vehicles people know the least. Wherever you are in Towpath or the remainder of Surrey, it's the same slip and the same first answer: leave the vehicle off.
Already started the engine with AdBlue in the diesel tank around Towpath?
Then the tank is no longer where the AdBlue is. With any running time, it goes on to the high-pressure pump and each injector, having passed via the fuel filter and pipework.
Maybe returning from D'Oyly Carte Island, or midway across Towpath, your engine might go rough, smoke, drop pace, flash the dash or stall. Pull over when it is safe. Turn off. Keep the vehicle off instead of testing it again. Every start pulls more of that through.
If you were on the M3, under a mile from Towpath, come off at the next exit and stop somewhere safe instead of pressing on.
A quick hop across Towpath to the car park by Weybridge Lawn Tennis Club is one thing; driving towards Westminster, under 25 miles away, is another, because every mile carries the AdBlue further in. So mileage matters. Tell us about how far it had come.
Wherever the vehicle came to a halt is where all of it gets done, even with more to flush once your engine has been run. If it is noticed early, lasting damage is very uncommon.
What does an AdBlue drain on a diesel involve around Towpath?
Anywhere it has stopped around Towpath — a forecourt, a lay-by, a driveway, a street beside Desborough Sailing Club — the van comes to the vehicle. Which fluid got in, about the quantity, and whether your engine has turned over: our technicians check first, since those shape the job.
Right there, that tank is then drained, and both the contaminated diesel and the urea leave at once. Residue from AdBlue won't wash out unaided, and so the whole system gets a careful flush, which counts far more with urea than for petrol. Clean diesel goes in after the fuel filter is flushed — or swapped, when it needs to be — and then the car is tested. Engine not run? In that case expect about half an hour on site for most jobs. Quiet enough to use outside a house at night, and fine on a busy forecourt, our pumps are explosion-proof.
Bleeding your system with fresh diesel comes at the end. You set off as soon as our technicians have fired it up, and it makes no difference whether the vehicle is on a driveway in Towpath or in a space outside Addlestone. It's tested on fresh diesel to make sure it runs correctly before our technicians head off. Our technicians do it all wherever the vehicle has stopped, and it never has to be taken to a garage. Insurers want a VAT invoice and an engineer report, and you get both at the end.
About Towpath and where it is
Towpath is a small suburban area in Surrey, situated on the riverside with a low elevation of around 14 metres. Towpath is located near several notable nearby places, including Pharaohs Island, Hamm Court Estate, and Hamhaugh Island. Towpath has a population of approximately 568 residents and is characterised by predominantly detached housing. Towpath is also relatively close to London, at a distance of around 16.9 miles, and to the nearby city of Westminster, which is about 16.7 miles away.
AdBlue drains across Towpath and Surrey
AdBlue jobs in Towpath go to teams that cover the towns around it — Pharaohs Island, Hamm Court Estate as well as Hamhaugh Island — and much of Surrey further out, across TW postcodes. Assuming won't help by a county line or anywhere tricky to describe; ring and ask.
Anywhere the vehicle stands — your drive at home, a residential street, a car park, a forecourt — we drain it there, and there's no need to take it to us; which suits Towpath, a residential suburb, well.
What AdBlue in a diesel tank costs to put right in Towpath
Every job differs, so not one single quote would be honest. The price changes first with how long, if at all, the motor has been running, and next with the quantity of AdBlue that was put in. After that it depends on where your car is and whether a technician can get to it safely, which is easier on an open drive than in a tight space behind St Nicholas.
With that reason, every call from Towpath opens by asking the same trio — what got in, how much, if the engine ran — before any quote. When those are known, a range turns into one firm figure.
Priced by phone before the van sets out, the job is paid for on the day — card or phone, nothing in advance. While our engineer is travelling, check your insurance: many cover misfuelling.
Towpath: still beside the vehicle?
Then the most useful thing you can do is nothing to the car. Motor off, keys out, ignition off. Tell us it was AdBlue, roughly what quantity, and whether it ran, on 0333 366 0103. From there Petrol in Diesel takes over, in Towpath or wherever in Surrey.