--- title: AdBlue in a Diesel Tank Colesbrook — Don't Start It canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/colesbrook-dorset/ location: Colesbrook county: Dorset latitude: 51.049960 longitude: -2.277610 service: AdBlue in a Diesel Tank updated: 2026-10-03 --- # AdBlue in a Diesel Tank in Colesbrook? Don't Start It If AdBlue has got into your diesel tank, keep the motor off and keep the ignition off. Urea dissolved in water is all AdBlue is. Unlike fuel, it neither ignites nor blends, and nothing starts until your engine sucks it round. In Colesbrook, AdBlue in a diesel tank caught before your motor runs usually comes down to a drain and a thorough flush, just where the vehicle is. Call 0333 366 0103 before you do anything else. ## AdBlue in your diesel tank in Colesbrook: the first few minutes Do: - So no one can turn the ignition on, pull the keys out. - Close to moving traffic? So put the hazards on. - The empty bottle or your receipt shows us the product and the quantity, and so don't throw it away. - Our van finds you quickest with a postcode starting SP8 4, or simply the name of a street nearby, so phone from the car. Things not to do: - Not even briefly, and not to roll your car: your motor stays off. - Many diesels power their pump the moment the ignition comes on, and so leave the car off. - Don't top up with diesel to dilute it. AdBlue doesn't dilute in diesel; it separates out. - Never drive the car anywhere, not even a short distance along Horsefields. - Don't try to drain it yourself by the roadside. Ask the people behind the counter to help you move your vehicle away from the pumps if you're at a forecourt around Colesbrook, whether it is the Esso or somewhere else. Stopped on your own drive? Then it stays exactly as it is. ## AdBlue in a diesel tank: what it does AdBlue is made for your exhaust, not your engine. Stored in a separate tank, it's injected into the exhaust to clean the fumes. No part inside a fuel pump is designed for this liquid — and no part of that was meant to travel that way. It doesn't blend. After it is poured into a tank of diesel, AdBlue behaves nothing like fuel. The intake sucks fuel from the lowest part of that tank, and that's just where AdBlue settles: being heavier than diesel, it sinks. Simplest of all: one that had AdBlue in Lodbourne overnight and has not turned since. The liquid sits at the foot of your tank, undrawn — but it will be the first thing through if the engine runs, ahead of any diesel at all. Two kinds of damage come from there. Crystals and corrosion. As the water dries, it strands urea that crystallises in filters and tiny channels; and, since it eats at some metals, every part it touches keeps suffering for as long as it stays inside. A vehicle left sitting around Colesbrook with AdBlue already in its lines is worse by the morning; one with AdBlue only in its tank is not. The water in it does damage of its own: the high-pressure pump and your injectors rely on diesel to lubricate them, and water offers them nothing. ## AdBlue in a diesel: why it is commonly worse than petrol Put petrol in a diesel at the Shell and you have a fault of thin fuel. Damage only comes from running on it. Blended into your diesel and sitting inside your tank, it causes none. With AdBlue in a diesel, the liquid itself is simply the wrong one. Since it does not burn, running it through isn't an option. Nor can it be watered down, because it separates again — and the next tankful won't rinse away deposits or corrosion. So the flush counts for more with AdBlue, and turning your key "to see", in the heart of Colesbrook or out in Cold Harbour, costs more than nearly any other slip. The good news is the same as with petrol. Emptying a tank is the easiest job on a fuel system, and without start-up, the AdBlue stays in there — wherever in Dorset your vehicle sits. ## AdBlue in a diesel tank around Colesbrook: how it ends up there Nobody means to do it. The AdBlue filler on plenty of cars sits right next to the diesel filler, occasionally under the same flap, and the two caps can look alike in poor light. Most of the time it takes place with a bottle bought on the way home and poured in on the drive, not at the pump. Usually, it occurs in one of a few familiar ways. The top-up is rushed outside Milton-on-Stour Church of England Primary School, because your dash lit up with a warning as the kids were taken off. Someone tips the container in outside their house, just off Swallowfields, as the day ends. Or the vehicle is topped up in the car park outside The Dolphin, in poor light, by someone who has never opened that flap before. Rented vehicles, brand-new cars, fleet motors, or the spare vehicle in a home with one of each: the least familiar vehicles get it the most. Same slip, same first step — keep it switched off — anywhere you happen to be around Colesbrook or the rest of Dorset. ## Colesbrook: started the motor with AdBlue in the diesel tank? Then the AdBlue has left your tank. It's been drawn through the fuel filter and the lines, and if the motor ran for any time, it has got to the high-pressure pump and the injectors. You may see the motor running unevenly, smoking, losing power, showing warning lights or cutting out, perhaps on the way back from Frog Hollow or halfway across Colesbrook. When you safely can, stop and switch it off — without turning it on again to test. With each start, more of that is pulled through. On the M5, under 50 miles from Colesbrook, the next junction is where to leave, and anywhere safe is where to stop — not carrying on. Mileage counts: each mile pushes the AdBlue deeper into your system, so heading towards Wells, under 25 miles away, gives a much larger job than crossing Colesbrook to the car park by St Simon & St Jude. Approximately how far had it come? Tell us. There is more to flush once the motor has been run, and we do all of it where your car has ended up. Long-term damage is very unusual if it is caught soon. ## What emptying AdBlue from a diesel involves in Colesbrook Our technicians come to your car, wherever it has stopped around Colesbrook: a side street near St Benedict, a drive, a lay-by or a forecourt. The work rests on three replies, and we get first — what got in, the quantity, and if your motor has turned over. Next, draining the tank on the spot takes out the contaminated diesel and the AdBlue together. A careful flush counts much more after AdBlue than with petrol, since residue won't clear out on its own. Fresh diesel goes in after the filter is cleaned — or swapped, if it needs to be — and after that your vehicle is tested. Engine not run? Then count on about half an hour once we are there for most jobs. Our pumping gear is explosion-proof, so a live filling station is no fault, and it is hushed enough for a residential street late at night. Lastly, your system is primed with fresh diesel. Starting it comes next, and then you set off from where your car is parked, by Gillingham (Dorset) or on a driveway in Colesbrook. Before we go, our technicians confirm it is running smoothly with new diesel in. Since the job is done in full where the vehicle is, a workshop never comes into it. Afterwards, you are given paperwork for the insurer: a VAT invoice and a written report from the engineer. ## About Colesbrook itself Colesbrook is a small hamlet situated on the riverside in Dorset, with an elevation of around 75 metres. Colesbrook lies near the villages of Peacemarsh and Milton on Stour, and is close to the hill of Bowridge Hill. Colesbrook has a population of approximately 1240 residents, who mostly live in semi-detached houses. Colesbrook is located about 19 miles from the city of Wells and around 98 miles from London. ## Colesbrook and Dorset: AdBlue drains across the area Over the SP postcode area, the teams answering AdBlue jobs in Colesbrook serve most of Dorset as well, Peacemarsh, Bowridge Hill and Milton on Stour among them. If you're close to a boundary, or somewhere hard to describe, ring and ask instead of assuming. Colesbrook is a rural hamlet, and a call-out drain suits it: whether your car is on a home drive, a residential street, a car park or a forecourt, our technicians drain it where it stands, so it never needs to be moved to us. ## What does AdBlue in a diesel tank cost to sort out around Colesbrook? Every job differs, and so not one fixed price would be honest. Whether the engine has run, and for how long, comes first in what moves the cost. How much AdBlue got in comes next, and then the position of the vehicle, since an open drive is simpler for our van to get to safely than a tight spot behind St Mary the Virgin. Which fluid went in, what quantity, plus whether the engine ran: each Colesbrook call begins by asking exactly those, ahead of any figure, not afterwards. Once those are known, a range turns into a single fixed number. The quote is quoted during the call, before a van sets off; payment comes on the day, by card or by phone, and nothing upfront. Many insurance policies include misfuelling cover, so it is worth checking yours whilst we are on the way. ## Still alongside the car around Colesbrook? Not touching your car is, then, the best move you can do. Keys out; engine and ignition off. Say it was AdBlue, roughly how big an amount, and if it ran, on 0333 366 0103. From there Petrol in Diesel takes over, in Colesbrook or wherever in Dorset.