--- title: AdBlue in a Diesel Tank The Close — Don't Start It canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/the-close-wiltshire/ location: The Close county: Wiltshire latitude: 51.062060 longitude: -1.796160 service: AdBlue in a Diesel Tank updated: 2026-10-08 --- # AdBlue in a Diesel Tank in The Close? Don't Start It If AdBlue has gone into your diesel tank, leave the motor off and keep your ignition off. Chemically, AdBlue is just urea in water. The harm begins once it is pulled through the lines — it will not burn, and it will not combine with diesel. Caught before your engine has run, AdBlue in a diesel tank is normally a drain and a thorough flush, done where the vehicle is in The Close. Before you do anything else, call 0333 366 0103. ## AdBlue in your diesel tank in The Close: the first few minutes Do these: - Pocket your keys, which prevents someone turning the power on. - Put the hazard lights on if you're anywhere near moving traffic. - Which product, and roughly what quantity? Save the bottle or the till receipt, and we can see. - Ring right where you are. Quote a SP1 2 postcode or the closest street name, and no one has to search for you. Things not to do: - Don't start your engine, even for a moment to shift your car. - Many diesels run their fuel pump the moment your ignition goes on, and so keep it off. - AdBlue doesn't mix in diesel — it separates out — so adding extra fuel won't thin it. - Even a short way up St. Nicholas' Road is too far to drive the car. - Do not try to drain it yourself by the roadside. Rolling your car off the pumps is a job for staff to help with, wherever The Close forecourt you're on, the BP or any other. At home, your car stays just as it is. ## AdBlue in a diesel tank: what it does AdBlue is made for the exhaust, not the motor. Its own reservoir holds it, and from there it is fed into your exhaust, where it cleans the gas. A fuel pump isn't designed to take it, and AdBlue was never supposed to go through one. Fuel blends; AdBlue, once tipped in, will not. The behaviour is nothing like diesel's. Heavier than diesel, it drops and collects underneath it — the very place the pickup sucks from. When your pump runs, the AdBlue is top of the list to go through. Before then it sits beneath the diesel, and that is why a car topped up in St Pauls yesterday and not switched on remains the simple case, provided nobody turns your key. From there it does two kinds of harm. It attacks certain metals found in fuel components, attacking any part it touches until it is cleared completely. And once the water goes, the urea turns into crystals that block filters and settle in narrow passages. If the AdBlue is in the lines, leaving it till morning around The Close leaves things worse. In your tank only, waiting costs nothing. And there's the water: it offers no lubrication to the parts that need it most — the injection pump and every injector. ## Why is AdBlue in a diesel regularly the bigger problem? An issue of thinned fuel is what you get after fuelling a diesel with petrol from the Esso. No harm is done as long as it stays put, blended into the diesel — only when the motor runs on it. AdBlue in a diesel is a problem of the wrong substance altogether. It doesn't burn, and so it cannot just be run through. Nor can it be thinned, because it splits back out — and the following tankful won't clear away crystals or corrosion. So the flush matters more with AdBlue, and turning the key "to see", in the heart of The Close or out in Milford, does more harm than almost any other slip. The same good news holds as with petrol. If your motor hasn't run, the AdBlue is still inside the tank, and that tank is the quickest part of a fuel system to clear, wherever across Wiltshire your car is sitting. ## The Close: how AdBlue ends up in a diesel tank In dim light, two caps side by side — the AdBlue one and the diesel one, now and then behind one flap — can look the same. No one means it; many layouts invite it. Usually it's not the filling station: a driver buys a bottle heading home and tips it in outside the house. Mostly, it occurs in one of a couple of familiar ways. The refill is hurried outside St Osmund's Catholic Primary School, Salisbury, after your dash flashed with a warning while the kids were dropped off. Near De Vaux Place, a driver tips a container in on that drive after work. Or someone new to that flap refills your vehicle in dim light, parked in the car park by The Greyfisher. It occurs most in the cars people know least: a hire car, a new motor, a company car, or the second motor of a household with one diesel and one petrol. Wherever across Wiltshire, The Close as well, the mistake doesn't change, and nor does the first response: leave it switched off. ## AdBlue in your diesel tank around The Close, and the motor started? The AdBlue has left that tank, then. Given any running time, it travels to the injection pump and each injector, having passed through your filter and lines. Rough running, smoke from the exhaust, lost power, dashboard lights or stalling: each may show up, maybe midway across The Close or returning from The Cloisters. Stop as soon as it is safe, switch off, and don't restart the vehicle to check. With each start, more of it is pulled through. On the M27, under 15 miles from The Close, the first junction is where to exit, and somewhere sensible is where to park — not driving on. Distance counts: every mile pushes the AdBlue deeper in, so heading towards Salisbury, under a mile away, gives a much bigger job than crossing The Close to the car park by Salisbury Cathedral. Tell us roughly how far it had come. Once your engine has run, the flush includes more, and all of it is done where your car has ended up. If it is spotted soon, permanent damage is very unusual. ## What does an AdBlue drain on a diesel involve around The Close? A street by St Osmund Catholic Church, a drive, a layby or a filling station: wherever your car has come to rest in The Close, our technicians come to it. Before anything else we ask what was put in, about how much, and if your engine has run, because those replies determine the work. The polluted diesel and the urea come out together when that tank is emptied, on the spot. A careful flush matters much more with AdBlue than with petrol, since residue will not wash away on its own. The filter is flushed, or replaced where it needs to be; fresh diesel goes in; and the vehicle is tested. If the motor hasn't run, most jobs take about half an hour once we are there. The equipment is explosion-proof, so a busy forecourt is no problem, and it is hushed enough for a residential street after dark. New diesel goes in to bleed the system, and that's the last step. You head off as soon as our engineers have started the car, and it makes no difference whether your car is on a drive around The Close or in a space outside Salisbury. Before we leave, our technicians confirm it's running smoothly with clean diesel in. The entire job is done where the vehicle is, so it never has to go to a garage. You receive a VAT invoice and an engineer report later on, which is what insurers want. ## About The Close, for a moment The Close is a suburban area located on the riverside in Wiltshire, with The Close sitting near the confluence of the rivers Avon and Nadder. The Close has an elevation of 46 metres and is situated close to the city of Salisbury, with The Close being a short distance from the city centre. The Close is predominantly composed of flat housing, with The Close being a popular residential area for those working in Salisbury. ## AdBlue drains across The Close and Wiltshire Over the SP postcode area, the vans taking AdBlue jobs around The Close serve most of Wiltshire as well, The Friary, Harnham and Salisbury among them. Assuming doesn't help close to a border or anywhere hard to describe; ring and ask. A van that comes to you fits The Close, a residential suburb: you have no need to bring the vehicle to us, because our engineers empty it there, in a drive, a side street, a car park or a filling station. ## What AdBlue in a diesel tank costs to put right in The Close Each job is different, so not one single price is fair. Whether the engine has run, and for how long, comes first in what moves the price. How much AdBlue got in comes next, and then the position of your car, because an open driveway is simpler for a van to get to safely than a tight spot behind Angels Harmony. With that in mind, each enquiry from The Close opens by asking the identical trio — which fluid went in, what quantity, whether it ran — ahead of any quote. Their replies shrink a range down to a single number. Before anyone heads out, you are told our price by phone. And payment is on the day, by card or over the phone, with nothing in advance. Plenty of insurance policies include misfuelling cover, and so it's worth checking yours while we are on the way. ## Beside the car in The Close, right now? Then, touch nothing — that is the best move there is. Keys out, motor off, ignition off. Phone 0333 366 0103 then tell us it's AdBlue, about how much, and whether it has run. Petrol in Diesel takes it from there, in The Close or anywhere in Wiltshire.