--- title: Cootham: AdBlue in a Diesel Tank? Don't Start canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/cootham-west-sussex/ location: Cootham county: West Sussex latitude: 50.919520 longitude: -0.468960 service: AdBlue in a Diesel Tank updated: 2026-10-20 --- # Cootham: AdBlue in the Diesel Tank? Leave It Off If AdBlue has got into the diesel tank, keep your engine off and keep your ignition off. Water with urea dissolved in it: that is AdBlue. It doesn't burn, it does not mix with diesel, and the harm it does starts when your fuel system draws it in. In Cootham, AdBlue in a diesel tank caught before the motor runs usually means a drain and a thorough flush, right where your car is. Before you do anything else, ring 0333 366 0103. ## AdBlue in the diesel tank in Cootham: the first few minutes To do: - So no one can switch your ignition on, take your keys out. - Put the hazards on if you are at all close to moving traffic. - Which fluid, and roughly what volume? Hang on to the bottle or the till receipt, and we can know. - Our van finds you quickest with a postcode starting RH20 4, or simply the name of a street nearby, so call from the car. Do not: - Moving the car just a short way is no reason to start your engine. - Turning your key to ignition by itself sets the pump running on plenty of diesels. Avoid it. - AdBlue doesn't mix in diesel — it separates out — so adding extra fuel will not weaken it. - Keep the car where it is rather than driving it anywhere, even a short stretch down Warren Croft. - Do not try to drain it yourself at the roadside. Get the attendants to help you move the vehicle off the island if you are on a forecourt in Cootham, whether it is the Esso or somewhere else. At your own drive, do not touch it at all. ## AdBlue in a diesel tank, and what it does there AdBlue is made for your exhaust, not the motor. It goes into its own tank and is sprayed into your exhaust gas to fresh it. No part inside a fuel pump is made for this fluid — and no part of that was intended to travel that way. Fuel blends; AdBlue, once tipped in, will not. Its behaviour is nothing like fuel's. The intake takes fuel from the deepest part of your tank, and that is just where AdBlue ends up: as it is denser than diesel, it sinks. A motor topped up on a drive in Smock Alley overnight and left unstarted counts as the straightforward case. No pump has pulled the AdBlue up so far — but once the motor turns, that is what goes first, directly from the bottom of your tank. Once it is drawn in, the harm comes in two forms. What remains when the water evaporates is urea, which forms crystals: they settle in tiny passages and block filters. Worse, it eats at some metals in a fuel system, and carries on until it is cleared out. Overnight, a car sitting in Cootham with AdBlue through its pipework gets worse; where it is only in that tank, it doesn't. The water in it does damage of its own: the high-pressure pump and the fuel injectors depend on diesel to lubricate them, and water gives them nothing. ## Why AdBlue in a diesel is regularly more significant than petrol Petrol put into a diesel on Power's forecourt leaves the fuel watery — that is the main problem. No damage comes while it stays put, mixed into the diesel — only once your motor runs on it. The trouble with AdBlue in a diesel is a completely wrong liquid. It doesn't burn, so it cannot simply be run through. Whether the vehicle is in Wiggonholt or the heart of Cootham, turning it over "to see" costs more with AdBlue than almost any other mistake, and the flush matters for more. Why: it will not stay blended, and so watering it down is impossible; and deposits and corrosion outlast the next tankful. The same good news holds as with petrol. Never started? Then the AdBlue sits just inside your tank, the easiest section of the entire system to clear, anywhere the car has stopped in West Sussex. ## How does AdBlue end up in a diesel tank in Cootham? No one means to do it. The AdBlue filler on many vehicles sits right next to the diesel filler, occasionally under the same flap, and the two caps can look alike in poor light. It usually occurs at home, from a container bought en route home, not at the filling station. It tends to occur in a couple of familiar ways. Midway through the drop-off, the dashboard flags it up, and outside Storrington Primary School the top-up is hurried. A driver pours the container in at home, right off Cassidy Place, as the day ends. Another pattern: dim light, the car park outside The Crown Inn, and a driver opening that flap for the first time. It happens most in the motors motorists know least: a hire car, a new car, a company car, or the second car of a household with one diesel and one petrol. Wherever you are in Cootham or the rest of West Sussex, it is the same slip and the same first answer: leave the car off. ## Started the engine with AdBlue in the diesel tank in Cootham? Then the AdBlue has left the tank. The filter and lines have had it sucked along, and some running takes it on to the high-pressure pump and each injector. You may notice your engine running roughly, smoking, losing power, showing warning lights or cutting out, perhaps on the way back from Pineytote or halfway across Cootham. Pull over when it is safe. Turn off. Keep the vehicle off rather than restarting it to check. More of it is pulled through with each start. If you were on the M23, under 25 miles from Cootham, come off at the next exit and stop somewhere safe rather than pressing on. Hopping across Cootham to the car park by Chanctonbury Sports & Leisure Centre is one thing; driving for Chichester, under 15 miles away, is something else, because every mile carries the AdBlue further in. So mileage matters. Let us know about how far it had come. There is more to rinse out once the engine has been started, and our engineers do all of it where your car has come to a stop. If it's caught quickly, long-term damage is very uncommon. ## What does an AdBlue drain on a diesel involve in Cootham? A road by Our Lady of England Catholic Church, a drive, a lay-by or a filling station: anywhere your vehicle has come to rest around Cootham, we travel to it. Three replies decide the work, and so before anything else our technicians ask which fluid went in, about what quantity, plus if the engine has turned over. Next, emptying the tank on the spot removes the polluted diesel and the AdBlue together. With AdBlue, far more than with petrol, flushing matters: the whole system is cleaned right through because what remains will not flush out unaided. Fresh diesel goes in after the filter is cleaned — or swapped, if it needs to be — and then your vehicle is tested. If the engine has not run, the majority of jobs take about half an hour once our technicians arrive. Our pumping gear is explosion-proof, and so a busy forecourt is no issue, and it is hushed enough for a residential street after dark. New diesel goes in to prime the system, and that's the final step. Starting it comes next, and then you set off from where the car is parked, at Pulborough or on a drive in Cootham. The test before our technicians head off is that it runs smoothly on clean diesel. No workshop is required at any stage, with the whole job done on the spot. Afterwards, there is paperwork for the insurer: a VAT invoice and a written report from the engineer. ## About Cootham Cootham is a village situated in a riverside setting in West Sussex, with an elevation of 34 metres above sea level. Cootham lies near the cities of Chichester and London, being approximately 14.7 and 43.2 miles away respectively. Cootham is characterised by its predominantly detached housing stock and is surrounded by nearby places such as Storrington, Sullington Warren, and Sullington. Cootham has a population of around 1703 residents. ## Cootham and West Sussex: AdBlue drains across the area Throughout the RH postcode area, the vans answering AdBlue jobs in Cootham reach much of West Sussex as well, Storrington, Sullington Warren and Sullington among them. Phone and check instead of guessing if you are by a county line, or somewhere tricky to pin down. A van that comes to you suits Cootham, a village: you have no need to take the car to us, because our technicians empty it on the spot, on a driveway, a side street, a car park or a filling station. ## AdBlue in a diesel tank in Cootham: the cost of fixing it Since each callouts differ, a single price would not be honest. What changes the price is, first of all, whether the motor has run and for how long; then how much AdBlue went in; and then where your car is and whether a technician can reach it safely, which is simpler on an open driveway than in a tight spot behind Storrington Village Hall. That's why each call from Cootham starts with the same three questions, asked before giving a figure, not after: what got in, how much, and whether it's run. Once those are known, a range turns into one fixed figure. Before a van sets off, you hear our quote on the phone. And you pay on the day, by card or by phone, with nothing upfront. Check your insurance whilst we're on the way: plenty include misfuelling cover. ## Still alongside your car in Cootham? Then the most handy thing you can do is nothing to the car. Ignition off, engine off, keys out. Call 0333 366 0103: AdBlue, roughly how much, and if it ran is everything our technicians ask. Petrol in Diesel handles the remainder across West Sussex, Cootham included.