--- title: Explained: AdBlue in a Diesel Tank Carrville canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/carrville-durham/ location: Carrville county: Durham latitude: 54.790970 longitude: -1.525480 service: AdBlue in a Diesel Tank updated: 2026-10-28 --- # Carrville: How Does AdBlue End Up in a Diesel Tank, and How Do You Avoid It? Leave your motor and ignition off and phone 0333 366 0103 first — the rest can wait when AdBlue is already in your diesel tank. Normally, if the engine hasn't run, it is drained and thoroughly purged where your vehicle sits around Carrville. Not happened yet? Below, the page covers the why it takes place and the how to prevent it for good. ## AdBlue in a diesel motor: two tanks, two fillers Plenty of modern diesels in West Sherburn, as well as Carrville, run on two fluids; your engine gets only your diesel. Your exhaust, not the motor, is where AdBlue goes: dosed into the fumes to fresh them, from its own tank. Each tank has its own filler. Many of vehicles share a single flap for the two, whereas others put the AdBlue filler to the boot or under the bonnet. At the pump, your diesel side gets filled constantly. Rarely filled, AdBlue normally comes from a bottle, tipped by someone who has to stop and think which cap it needs. The error lives in that gap. ## How does AdBlue in the diesel tank occur around Carrville? Rarely is it carelessness: normally three things line up. To start with, the warning. Low AdBlue triggers a message from the car, and running dry leads to limp mode — hence a hurried top-up, perhaps before work off High Street, or at The Travellers Rest on the way home that evening. Then the car is unfamiliar. A hire car, a new car or a company car puts the fillers where your last one didn't, and the hand reaches for the cap it would have used on the old one. Nothing halts the tip once it has started, since a bottle with a spout goes into a diesel filler as easily as an AdBlue one. The bottle fits. Belmont or the heart of Carrville: it takes the same few seconds either way. ## Telling the AdBlue filler from your diesel filler Before you tip anything, whether on a driveway in Pittington or a forecourt in Carrville, check these. They take a few seconds. - Position can mislead; the cap doesn't. AdBlue caps tend to be blue or bear the name "AdBlue" — diesel ones usually don't. - The size. On plenty of motors the AdBlue filler neck is the smaller of the two. - The flap. Look inside the fuel flap for a label. Many vehicles say there which fuel goes where. - The handbook says which it lives if your filler isn't next to the diesel cap: the boot, or under the bonnet. - The person who drove it last. On a hire or company car collected from somewhere like the car park at Durham, ask before you leave, not when the light comes on. ## AdBlue top-ups that never reach your diesel tank A routine for the day the light comes on, wherever in Durham that is. - Not in a rush on the side of Kirkstone Drive, not on a slope, not with the engine running: park and switch off properly. - Daft as it sounds, saying "AdBlue" out loud as you unscrew the cap does the trick — after you've found the filler and read the cap. - The diesel cap stays on. When both sit under a flap, confirm it is closed before the bottle comes up. - Using the bottle's own spout, tip slowly — and stop when it is full or the bottle is empty. - Only then, start your car: close the cap, check once more, and make sure your diesel cap was never opened. Stop there if you find, at step two or three, that you have already poured into your diesel side. Never carry on to stage five. ## Put AdBlue in your diesel tank around Carrville already? Then the order of things is short. Don't start the engine. On plenty of diesels your ignition alone runs the fuel pump, so don't switch the vehicle on. AdBlue doesn't mix with diesel — it sinks to the bottom of the tank, where your fuel is sucked from — so do not top up with diesel to dilute it. Ask the staff to help roll your car away from the pump if you're at a forecourt — the Shell, the Esso or somewhere else. Your own driveway around Carrville is where it should stay. Stop as soon as it is safe then switch off, if your motor has already run. On the A1(M), under a mile from Carrville, that means the next junction. Tell us roughly how far it went: a run towards Durham, under 3 miles away, is a bigger job than a short hop across Carrville. ## What occurs when our technicians turn up around Carrville By Belmont Cheveley Park Primary School, close to Carrville Methodist Church or on your own driveway: wherever the car has stopped, our engineers come to it. Which fluid got in, the quantity, and whether it ran: our engineers ask since the answers decide both work and price. On the phone call itself, you hear the quote — before dispatch. Then that tank is drained and the fuel system cleaned thoroughly. With AdBlue that counts more than with petrol: it crystallises and is corrosive to some of the metals in a fuel system, so it doesn't wash out on its own. The filter cleaned or, if it must be, swapped; clean diesel in; then a test of your car. Before we leave, our engineers fire it up and check that it's running correctly. Most jobs are done in roughly half an hour after our engineers get there, as long as the engine has not run — and the pumps our engineers use are safe on a live forecourt and quiet after dark outside a house. Nothing in advance; you settle up that day. Afterwards, a VAT invoice and a report from the engineer go to you for your insurer. Plenty of insurance policies include misfuelling cover, so it is worth checking yours whilst we're on the way. ## About Carrville and where it is Carrville is a suburban area located near the city of Durham, sitting at an elevation of 77 metres in the inland countryside of County Durham. Carrville is characterized by its predominantly semi-detached housing stock and is situated close to nearby places such as Belmont and Sherburn Grange. Carrville is a relatively small community, with a population of approximately 3536 residents, and is within easy reach of Durham city centre, being just 2.4 miles away. Carrville is also part of the wider North East region, with London being around 234 miles to the south. ## AdBlue drains around Carrville and across Durham Carrville is a residential suburb, and the teams that cover it also work the places near it, Sherburn Grange and Gilesgate Moor among them, across the DH postcode area. A postcode starting DH1 1 gets our van to you fastest. Shifting the vehicle isn't necessary. The drain takes place on the spot, be it a driveway, a road near Belmont War Memorial, or a lay-by towards TDC Garden. Guessing doesn't help behind Belmont Parish Hall, on a boundary, or anywhere hard to describe; ring and ask. ## In short, for Carrville people Tip nothing till you have read the cap. If AdBlue has gone in the diesel tank regardless, leave the vehicle off then phone 0333 366 0103. Petrol in Diesel drains it where it stands, anywhere in Durham.