--- title: Don't Start It: AdBlue in a Diesel Tank Biddisham canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/biddisham-somerset/ location: Biddisham county: Somerset latitude: 51.272900 longitude: -2.885730 service: AdBlue in a Diesel Tank updated: 2026-10-04 --- # AdBlue in the Diesel Tank in Biddisham? Keep It Switched Off Engine off, ignition off: that's how you start if AdBlue has gone into the diesel tank. In plain terms, AdBlue is simply urea in water. Being water-based, it will not ignite and never combines with diesel; trouble just starts once your pump starts drawing it. In Biddisham, AdBlue in a diesel tank caught before your engine runs usually means a drain and a thorough flush, just where the vehicle is. Ring 0333 366 0103 before you do anything else. ## Biddisham, AdBlue in your diesel tank: what to do right away Do these: - So nobody can switch your ignition on, take your keys away. - If you're at all near moving traffic, put your hazards on. - So you can tell us which fluid it was and about what quantity, save the receipt or the empty bottle. - Ring us from where you are. A postcode starting BS26 2, or the name of the closest street, brings our van to you without a search. Things not to do: - No starting the motor — not briefly, not to reposition the car. - Do not switch your ignition on. On plenty of diesels that alone runs the fuel pump. - No more fuel added. The AdBlue will not blend, and so it is pointless. - Keep the vehicle where it is rather than driving it anywhere, even a short way along Rees Way. - By the road, do not attempt emptying it on your own. Ask the attendants to help you roll the car off the pumps if you're on a forecourt in Biddisham, whether it's the Shell or somewhere else. If you are on your own drive, leave the car exactly where it stands. ## AdBlue in a diesel tank: what it does The engine is not what AdBlue is made for; the exhaust is. Stored in a dedicated tank, it is squirted into the exhaust stream to clean the gases. Nothing in it is supposed to pass through a fuel pump, and nothing in a fuel pump is designed to handle it. Tipped in with your diesel, it stays apart rather than blending — entirely different from fuel. Heavier than diesel, it sinks and pools underneath it — the very place the intake sucks from. A car filled on a drive in Rooks Bridge overnight and not started since counts as the simple one. Nothing has sucked the AdBlue up so far — though once the engine turns, that's what goes first, straight from the bottom of that tank. It causes two kinds of damage from there. Crystals and corrosion. As the water dries, it leaves urea that crystallises in filter elements and narrow channels; and, since it attacks some metals, each part it touches suffers for as long as it stays inside. If the AdBlue has reached the lines, waiting till morning around Biddisham makes things worse. Inside your tank only, time does nothing. Then there is the water: it offers no protection to the components that need it most — the injection pump and each injector. ## Why is AdBlue in a diesel commonly the bigger issue? Petrol put into a diesel on BP Weare's forecourt makes the fuel watery — that is the main issue. Damage only comes from driving on it. Blended into your diesel and left inside your tank, it does none. AdBlue in a diesel is another problem: not thin fuel, yet no fuel at all. It doesn't burn, so it cannot just be run through. Nor can it be watered down, since it separates again — and the next fill won't rinse away crystals or corrosion. So the flush counts more here, and turning the key "to see", in the centre of Biddisham or out in Lower Weare, does more harm than nearly any other error. The good news is the same as with petrol. Never run? Then the AdBlue sits just in your tank, the easiest section of the whole system to empty, wherever your vehicle has come to rest around Somerset. ## AdBlue in a diesel tank around Biddisham: how it ends up there It is not deliberate. Plenty of vehicles keep the AdBlue inlet beside the diesel one, occasionally under a single flap, and mixing them up is simple in poor light. It usually takes place outside the house, from a container bought en route home, rather than at the filling station. It tends to take place in a few familiar ways. The top-up is hurried outside Weare Academy First School, after your dash lit up with a warning as the children were dropped off. Near Biddisham Lane, someone pours a bottle in at home after work. Otherwise, after dark outside Wellington Arms, your car is topped up by someone opening that flap for the first time. Hired vehicles, new cars, company motors, or the spare car in a home with one of each: the least known vehicles get it most. Wherever around Somerset, Biddisham included, the mistake does not change, and nor does the first step: leave it off. ## Started the engine with AdBlue in your diesel tank in Biddisham? If so, the AdBlue is no longer in that tank. Given any running, it goes on to the injection pump and each injector, after passing via the fuel filter and pipework. Expect lumpy running, smoke, lost power, lights on your dash, or a cut-out — returning from Shiplate Wood, perhaps, or midway across Biddisham. Stop when safe. Turn off. Leave the vehicle off rather than testing it again. With each start, more of that is pulled through. Exit the M5, under 3 miles from Biddisham, by the next junction and stop somewhere safe, not driving on. Mileage matters: each mile carries the AdBlue further into the system, so driving for Wells, under 15 miles away, makes a far bigger job than hopping across Biddisham to the car park by St John the Baptist. Tell us about how far it had come. Wherever the car came to a halt is where all of it gets done, even with more to flush after the motor has been running. If it's noticed early, long-term damage is very unusual. ## What draining AdBlue from a diesel involves in Biddisham Anywhere it has come to rest in Biddisham — a filling station, a lay-by, a drive, a street beside St Congar — the van travels to your vehicle. Three replies shape the job, and so before anything else our engineers ask what was put in, roughly what quantity, plus if the motor has run. Next, emptying the tank on the spot takes out the contaminated diesel and the AdBlue in one go. With AdBlue, far more than with petrol, flushing matters: the fuel system is flushed all the way through because what remains won't flush out by itself. Testing the vehicle comes at the end, after clean diesel is added and the fuel filter is cleaned or, if needed, replaced. Roughly half an hour once we arrive is typical for most jobs when your engine hasn't run. Low-noise enough to use outside a house at night, and fine on a busy forecourt, our pumps are explosion-proof. Lastly, the system is bled with clean diesel. Starting it comes next, and then you drive off from where your car is parked, at Highbridge & Burnham or on a driveway around Biddisham. The check before we go is that it runs properly on fresh diesel. Our engineers do it all wherever the vehicle has ended up, and it never needs to go to a garage. At the end, you are given paperwork for your insurer: a VAT invoice plus a report from the engineer. ## About Biddisham and where it is Biddisham is a small village in Somerset, situated near the villages of Tarnock, Badgworth, and Rackley, and approximately 11 miles from the city of Wells. Biddisham lies in a low-lying area, with an elevation of around 7 metres, and is characterized by its predominantly detached housing stock. Biddisham is a rural community with a population of around 554 people, located in the South West region of England, about 120 miles from London. ## AdBlue drains across Biddisham and Somerset Our teams that answer AdBlue call-outs around Biddisham also cover the places about it, Tarnock, Badgworth and Rackley among them, and most of Somerset beyond, across the BS postcode area. Close to a border, or anywhere tricky to explain? Asking is better than assuming, and so ring. Anywhere the car sits — your drive at home, a residential street, a parking area, a forecourt — our engineers empty it there, and there's no need to bring it to us; which suits Biddisham, a rural village, well. ## What AdBlue in a diesel tank costs to put right in Biddisham Not one flat figure would be fair, since each job differs. The cost moves 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 turns on where your car is and whether a van can get to it safely, which is simpler on an open drive than in a tight gap behind Webbington Farm. Before a quote, not afterwards, each enquiry from Biddisham opens with three questions: the liquid, the quantity, and whether the engine ran. Those answers turn a range into a straight price. Before a van sets off, you hear the quote by phone. Then you pay on the day, card or by phone, with nothing in advance. Misfuelling cover is part of plenty of insurance policies, so it is worth looking at yours before the van gets there. ## In Biddisham and still alongside the car? Leaving the vehicle alone is, right now, the best thing you can do. Keys out, motor off, ignition off. Phone 0333 366 0103 and tell us it's AdBlue, roughly how much, and if it has run. Petrol in Diesel takes it from there, around Biddisham or anywhere in Somerset.