--- title: Explained: AdBlue in a Diesel Tank Underwood canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/underwood-nottinghamshire/ location: Underwood county: Nottinghamshire latitude: 53.049480 longitude: -1.297480 service: AdBlue in a Diesel Tank updated: 2026-10-17 --- # Avoiding AdBlue in a Diesel Tank in Underwood: Why It Happens Keep the motor and ignition off then ring 0333 366 0103 first — the rest can wait when AdBlue is already in your diesel tank. Around Underwood, finding it before your engine runs usually leaves a drain and a thorough flush on the spot. The rest of this page covers why it happens and how to ensure it doesn't — useful if you're reading before it has happened. ## AdBlue in a diesel vehicle, and its separate tank Plenty of modern diesels in New Brinsley, as well as Underwood, run on two fluids; your engine gets only the diesel. AdBlue goes to the exhaust, where it is sprayed into the gas to clean it, and it lives in a tank of its own. There is a filler for each tank. Under one flap, side by side: that is the arrangement on many vehicles. Elsewhere, AdBlue's filler sits under the bonnet or in your boot instead. The diesel side is topped up at the petrol pump all the time. A driver who has to stop and work out where it goes usually tops up the AdBlue side, from a bottle, and much less often. The slip lives in that gap. ## AdBlue in the diesel tank around Underwood: how it takes place Seldom is it carelessness: usually three things coincide. On a drive off Smeath Road before work, or in the car park at Ginger Giraffe on the way home: that's where the hurried top-up happens. Why the rush? As AdBlue gets low the vehicle tells you, and if it is gone, limp mode kicks in. Unfamiliar cars are next, too. Rentals, new vehicles and company motors place their fillers in new places, and the hand goes for the cap it used on the old one. And the bottle fits. A bottle with a spout goes into a diesel filler as easily as an AdBlue one, so nothing stops the tip once it has started. It takes seconds, be it in Friezeland or right in the heart of Underwood. ## Which filler is for AdBlue, and which for diesel? A few seconds is all these take — so check them before you tip anything, on a driveway in Brinsley or a forecourt around Underwood. - Position can mislead; the cap does not. AdBlue ones are often blue or carry the name "AdBlue" — diesel ones usually don't. - On many vehicles, the size tells: AdBlue gets the smaller filler neck. - A label inside the fuel flap frequently shows which fuel goes where, on plenty of vehicles. Look for it. - The handbook. If the filler isn't by your diesel cap, it's in the boot or under the bonnet, and the handbook says which. - Ask the person who drove it last — before you leave, not when the light comes on — if you collect a hire or company car from somewhere like the car park at Langley Mill. ## Keeping AdBlue out of your diesel tank when you top up A routine for the day the light comes on, wherever in Nottinghamshire that is. - Not in a rush on the side of Wilcox Drive, not on a slope, not with your engine running: park then switch off first. - Find the AdBlue filler, read the cap, and speak the word "AdBlue" out loud while you unscrew it. It sounds daft. It works. - The two under a single flap? Then confirm the lid on the diesel filler is still closed before raising the bottle. - Tip slowly, using the bottle's own spout. Stop when it's full or when the bottle is empty. - Only after that, start the car: close the cap, check again, and make sure your diesel cap was never opened. If at step two or three you find you have already poured into your diesel side, stop there. Step five is off limits. ## Put AdBlue in your diesel tank in Underwood already? Then the order of things is short. Do not start your engine. The fuel pump starts on plenty of diesels the moment your ignition goes on — and so keep it off. Diluting it with extra diesel won't work, since AdBlue sinks to the base instead of mixing — and that's where the fuel is pulled from. At a forecourt — the nearest petrol station, Gulf or another — the attendants will usually help push the car away, if you ask. Your own driveway in Underwood is the place it stays. If your motor has already run, stop as soon as it is safe and switch off. Come off the M1 — under 3 miles out of Underwood — at the next exit. Roughly how far did it go? Hopping across Underwood is smaller work than a trip of under 10 miles to Nottingham, so say. ## Underwood: what occurs when our technicians get there Anywhere your car has stopped, whether outside Underwood Church of England Primary School, beside St Michael and All Angels or on your own drive, the van comes to it. Both the work and our quote rest on three answers — what liquid, which quantity, and if it's run — so our engineers ask. You get that quote by phone, before anybody heads out. Draining the tank comes next, followed by a thorough flush of your system. AdBlue crystallises and is corrosive to some of the metals in a fuel system, and so it doesn't wash out on its own — which is why the flush matters more here than with petrol. The filter is cleaned, or replaced where it needs to be; clean diesel goes in; and the car is tested. We do not leave until it has been fired up and is running smoothly. With pumps fine on a working forecourt and quiet enough for use outside a house at night, most jobs in which your motor hasn't run need about half an hour after our engineers arrive. The insurer will ask for an engineer's report and your VAT invoice, and you get both once this job is done. Payment comes on the day, with no deposit. Misfuelling cover is part of many insurance policies — so use the wait to check yours. ## About Underwood and where it is Underwood is a village in Nottinghamshire, situated inland at an elevation of around 138 metres, approximately 8.9 miles from Nottingham. Underwood has a population of around 1656 people and is characterised by predominantly detached housing. Underwood is located near other small places such as Friezeland and Bagthorpe, and is about 117.5 miles from London. ## AdBlue drains around Underwood and across Nottinghamshire Plain Spot and Bagthorpe are among the towns around Underwood, a rural village, that the same teams cover, over NG postcodes. Quickest of all: quote a NG16 5 postcode for our van. Moving the vehicle is not needed. The drain happens right there, whether a driveway, a street by Underwood Community Centre, or a layby on the way to Willey Spring. Ring and ask instead of guessing if you're near a boundary, or somewhere hard to explain, like the back of Brinsley Village Sign. ## In short, for Underwood people Always, the cap; after that, the tip. AdBlue in your diesel tank after all? Keep the car switched off and call 0333 366 0103; Petrol in Diesel drains it on the spot, throughout Nottinghamshire.