--- title: Don't Start It: AdBlue in a Diesel Tank Nailsworth canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/nailsworth-gloucestershire/ location: Nailsworth county: Gloucestershire latitude: 51.693860 longitude: -2.220220 service: AdBlue in a Diesel Tank updated: 2026-10-27 --- # AdBlue in the Diesel Tank in Nailsworth? Keep It Switched Off If AdBlue has gone into your diesel tank, keep the engine off then leave the ignition off. Urea dissolved in water is what AdBlue is. Being water-based, it won't ignite and never combines with diesel; trouble only starts once the pump starts drawing it. A drain and a thorough flush, done where the vehicle is in Nailsworth, is usually all AdBlue in a diesel tank takes — if it is caught before your motor has run. Before you do anything else, ring 0333 366 0103. ## Nailsworth, AdBlue in the diesel tank: what to do right away To do: - Remove your keys, and that stops someone switching the power on. - Put the hazards on if you're anywhere near moving traffic. - Keep the till receipt or the empty bottle, and so you can tell us what was put in and roughly how much. - Call just where you are. Say a GL6 0 postcode or the nearest street sign, and nobody has to hunt for you. Do not: - Moving your vehicle just a short way is no reason to start your motor. - Do not switch your ignition on. On plenty of diesels that alone runs the fuel pump. - Do not top up with diesel to dilute it. AdBlue does not dilute in diesel; it separates out. - Any driving at all is to be avoided, including a short way up Old Market. - Do not try to drain it yourself at the kerbside. The attendants on duty at any Nailsworth forecourt — the Shell among them — will usually help rolling it aside if you ask. At your own drive, don't move it at all. ## What AdBlue does in a diesel tank Made for the exhaust, AdBlue has no place in your motor. It goes into its own tank and is sprayed into the exhaust gas to fresh it. Nothing in a fuel pump is made for this liquid — and none of it was intended to go that way. It does not blend. Once it is poured into the tank, AdBlue acts not at all like fuel. It's heavier than diesel, and so it sinks and gathers at the bottom of your tank, which is where the pickup sucks fuel from. A car topped up on a drive in Rockness yesterday evening and left unstarted counts as the straightforward one. No pump has sucked the AdBlue up so far — but once the motor runs, that is what is pulled first, directly from the bottom of the tank. Once it is sucked in, the harm comes in two forms. It attacks certain metals found in fuel components, working on any part it reaches till it's cleared completely. And once the water evaporates, the urea forms crystals that block filters and lodge in tiny passages. By daybreak, a vehicle parked around Nailsworth with AdBlue in its lines grows worse; where it's just in the tank, nothing changes. Diesel protects the injection pump and every injector as it flows; water offers no lubrication, and that is a separate form of harm. ## Why is AdBlue in a diesel frequently the bigger problem? Put petrol in a diesel at the BP and you have a fault of thin fuel. Mixed through your diesel and left still, it is no threat for now; using your engine does the harm. The trouble with AdBlue in a diesel is a totally unsuitable substance. Not burning, it can't simply be run through. It doesn't stay mixed, so it can't be weakened. And crystals and corrosion do not wash out with the next tank of fuel. That's why the flush matters more with AdBlue than with petrol, and why starting the engine "to see" costs more here than almost anywhere else, whether your car is in Worley or the middle of Nailsworth. With AdBlue, the good news is no distinct from petrol. Not started? Then the AdBlue waits just in that tank, the simplest bit of the entire system to empty, anywhere your vehicle has stopped around Gloucestershire. ## AdBlue in a diesel tank around Nailsworth: how it ends up there Nobody means to do it. The AdBlue filler on many cars waits right next to your 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 driveway, not at the pump. Mostly, it takes place in one of a few familiar ways. The top-up gets rushed outside Nailsworth Church of England Primary School, after the dash flashed with a warning as the children were taken off. In the evening, a container is tipped in on a driveway near Newmarket Road. Another version: dim light, a pub car park by Britannia Inn, and someone opening that flap for the first time. It crops up the most in a rental, a brand-new vehicle, a company motor, or the spare vehicle in a home with one of each fuel types — the vehicles drivers use the least. Anywhere in Gloucestershire, Nailsworth included, the mistake doesn't change, and nor does the first step: leave it switched off. ## AdBlue in your diesel tank in Nailsworth, and the engine started? The AdBlue has left your tank, then. Via the fuel filter, along the pipework, and — with any running time — on to the injection pump and each injector: that is where it travels. Maybe coming back from Mortimer Gardens, or midway across Nailsworth, your engine may run rough, smoke, drop pace, flash your dash or cut out. Stop as soon as it is safe, switch off, and don't restart the car to check. Each start pulls more of that through. On the M5, under 10 miles from Nailsworth, the first junction is where to leave, and anywhere safe is where to park — not carrying on. Mileage counts: each mile carries the AdBlue further into your system, so heading towards Gloucester, under 15 miles away, gives a much larger job than hopping across Nailsworth to the car park by Mortimer Room. Roughly how far had it come? Tell us. There is more to rinse out once the motor has run, and we do all of it where your car has stopped. Long-term damage is very unusual if it is spotted early. ## What clearing AdBlue from a diesel involves in Nailsworth Wherever it has stopped around Nailsworth — a forecourt, a lay-by, a drive, a street by _form. gallery — our van travels to the car. The work rests on three answers, and our engineers get first — what went in, the amount, and whether your engine has turned over. The contaminated diesel and the urea leave as one when the tank is drained, right there. A full flush counts much more after AdBlue than after petrol, since what remains won't wash out on its own. After that, the filter: flushed, or replaced when it must be. Then fresh diesel, then a test of your car. If the engine has not run, most jobs take about half an hour once our engineers are there. The pumps are explosion-proof, fine on a working forecourt and quiet enough to use outside a house at night. The last step is to prime the fuel system on fresh diesel. Whether it's a parking space at Stroud or a drive around Nailsworth, that is where we start the car and you set off. The test before we go is that it runs properly on new diesel. The whole job is done where the car is, so it never needs to go to a garage. At the end, you are given the paperwork for your insurer: a VAT invoice plus a report from the engineer. ## About Nailsworth, briefly Nailsworth is a town situated in the valley of the River Frome in Gloucestershire, with a population of around 5964 people. Nailsworth sits at an elevation of 66 metres, near the Cotswold escarpment, and is characterised by its predominantly detached housing stock. Nailsworth is located near several smaller communities, including Millbottom, Walkleywood, and Egypt, and is within commuting distance of Gloucester, which is 11.8 miles away. Nailsworth benefits from its riverside setting, which has influenced the town's development over time. ## AdBlue drains across Gloucestershire, Nailsworth included Millbottom, Walkleywood and Egypt are among the towns around Nailsworth that the same teams serve, together with most of Gloucestershire further out, over the GL postcode area. Phone and ask rather than guess when you are close to a border, or somewhere tricky to pin down. Wherever the vehicle stands — a drive at home, a residential street, a parking area, a forecourt — we empty it on the spot, with no need to take it to us; that suits Nailsworth, a riverside town, well. ## Nailsworth: what AdBlue in a diesel tank costs to fix There is no honest single price, since the jobs are not the same. What changes the cost is, firstly, whether the motor has run and for how long; then how much AdBlue went in; and then where the car is and whether our van can get to it safely, which is easier on an open driveway than in a tight gap behind Quaker Friends Meeting House. That's why each call from Nailsworth starts with the same three questions, asked before giving a figure, not after: what went in, how much, and whether it has run. Once those are known, a range becomes a single firm figure. Priced by phone before the van sets out, it is settled that day — card or phone, no deposit. Misfuelling cover is part of plenty of insurance policies, so it is worth looking at yours before the van arrives. ## In Nailsworth and still alongside your car? In that case, touch nothing — that's the most helpful step there is. Keys out; engine and ignition off. Ring 0333 366 0103: AdBlue, the amount, and whether the engine ran are all our technicians ask. Petrol in Diesel handles the rest throughout Gloucestershire, Nailsworth too.