--- title: Cranbrook: AdBlue in a Diesel Tank, Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/cranbrook-devon/ location: Cranbrook county: Devon latitude: 50.747000 longitude: -3.410200 service: AdBlue in a Diesel Tank updated: 2026-10-09 --- # Avoiding AdBlue in a Diesel Tank in Cranbrook: Why It Occurs Keep the engine and ignition off then ring 0333 366 0103 first — reading can wait if AdBlue is already in your diesel tank. Around Cranbrook, finding it before the engine runs normally leaves a drain and a full flush where it stands. Not happened yet? Below, the rest of the page covers the reasons it occurs and the how to avoid it altogether. ## Two fillers, two tanks: AdBlue in a diesel car Diesel feeds your engine — yet many newer diesels driven around Cranbrook and Dog Village carry another liquid too. AdBlue goes to the exhaust, where it is sprayed into the gas to clean it, and it lives in a tank of its own. Each tank comes with a filler of its own. Many of cars have a single flap for the two, whereas others move the AdBlue filler to your boot or under the bonnet. Topping up your diesel side at the petrol pump goes on constantly. Rarely topped up, AdBlue normally comes out of a bottle, poured by a driver who has to stop and think which filler to use. It's in that gap that the error lives. ## Cranbrook: how AdBlue in the diesel tank occurs Three things tend to line up, and carelessness is rarely one of them. The warning comes first. As AdBlue runs low the vehicle tells you, and if it runs out altogether, the car drops into limp mode. So the top-up is done in a hurry: on a driveway off St. Michaels Way before work, or in the car park outside The Cranberry Farm on the way home. Then your 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. No part stops the tip once it has started, because a bottle with a spout goes into a diesel filler as readily as an AdBlue one. The bottle fits. The same few seconds decide it, in the middle of Cranbrook or out in Jack-in-the-Green. ## How to tell the AdBlue filler from the diesel one Look at these first, on a forecourt in Cranbrook or a drive out in Clyst Honiton. A few seconds, that's all. - Where it sits misleads; the cap doesn't. AdBlue caps are often blue or carry the word "AdBlue" — diesel ones normally do not. - On many motors, size gives it away: AdBlue gets the smaller filler neck. - The flap. Look inside your fuel flap for a label. Many motors say there which fuel goes where. - In the boot or under the bonnet: that is where your filler is if it is not by your diesel cap, and the handbook says which. - Check with the person who drove it last — before you leave, not when the light comes on — when you pick up a hire or company car from somewhere like the car park at Cranbrook (Devon). ## Topping up AdBlue without it reaching your diesel tank Anywhere in Devon the light comes on, this is a routine for that day. - Park and switch off. Not on a slope, not with the engine running, and not in a rush on the side of West Down Court. - Find the AdBlue filler, check the cap, and say the name "AdBlue" out loud as you unscrew it. It sounds silly. It does the trick. - If both sit under one flap, check your diesel cap is still closed before you lift the bottle — then leave it on. - Finish when that tank is topped up or the bottle runs dry; before that, tip gently through its own spout. - Before starting the car, shut the cap and look a second time that your diesel cap never opened off. Stop there if you find, at step two or three, that you've already poured into your diesel side. Stage five stays off limits. ## Already put AdBlue in the diesel tank around Cranbrook? Then the order of things is short. Don't start the motor. Leave the ignition off too, because on many diesels switching it on alone runs your pump. Filling up with diesel will not weaken it: rather than mixing, AdBlue drops to the base of that tank, right where fuel is taken from. If you are at a forecourt, whether it is the Murco or the Texaco, ask the staff to help push the vehicle away from the petrol pump. Your own drive in Cranbrook is where it should stay. Already run? Pull over when it's safe, then turn off. The next exit means the place to leave if you're on the M5, under 3 miles from Cranbrook. Roughly how far did it go? Crossing Cranbrook is smaller a job than a trip of under 10 miles to Exeter, and so say. ## When we get there around Cranbrook, what occurs? Our van reaches the vehicle anywhere it has come to rest — your own driveway, near Younghayes Centre, or by St Martin's CofE Primary & Nursery School. Both the work and our quote depend on three replies — which liquid, what amount, and if it has run — so our technicians ask. You get that quote on the phone, before anybody heads out. After that: draining, then a full flush of the entire system. With AdBlue that matters 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. Once the filter is flushed — or replaced, where needed — clean diesel goes in, and then the car is tested. We do not leave until it has been fired up and is running correctly. With pumps fine on a working forecourt and quiet enough to use outside a house at night, most jobs where the motor hasn't run take roughly half an hour once our engineers arrive. You pay on the day, with nothing upfront, and get a VAT invoice and an engineer report for your insurer. Plenty of insurance policies include misfuelling cover, and so it's worth checking yours whilst we are on the way. ## About Cranbrook, for a moment Cranbrook is a village in Devon, situated on the River Clyst at an elevation of 32 metres, approximately 5.6 miles from Exeter. Cranbrook has a mix of housing types, with semi-detached homes being predominant, and is close to nearby places such as Jack-in-the-Green and Rockbeare. Cranbrook is part of the wider Exeter urban area, yet retains its own distinct character as a riverside community. Cranbrook has a population of around 2397 people, according to recent estimates. ## AdBlue drains across Devon, Cranbrook included Over EX postcodes, the teams that cover Cranbrook — a village — work the nearby places too, Higher Burrowtown and Rockbeare among them. A postcode starting EX5 7 gets our van to you fastest. There's no need to shift your car. A driveway, a lay-by on the way to Hayes Square, a side street close to Rockbeare War Memorial: our engineers drain the car where it sits. If you are close to a border, or somewhere hard to explain like the back of Saint Mary with Saint Andrew, ring and ask rather than assuming. ## Cranbrook motorists: the short version Before you pour, read the cap. Even so AdBlue in the diesel tank? Petrol in Diesel can drain it where it stands, anywhere around Devon: keep the vehicle off and call 0333 366 0103.