--- title: AdBlue in a Diesel Tank Cotteylands: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/cotteylands-devon/ location: Cotteylands county: Devon latitude: 50.902300 longitude: -3.501710 service: AdBlue in a Diesel Tank updated: 2026-10-27 --- # Cotteylands: How Does AdBlue End Up in a Diesel Tank, and How Do You Prevent It? Keep your motor and ignition off and phone 0333 366 0103 now — reading can wait if AdBlue is already in the diesel tank. In Cotteylands, catching it before your motor turns normally leaves draining and a thorough flush on the spot. The rest of this page covers why it takes place and how to make sure it does not — useful if you're reading ahead of time. ## Two fillers, two tanks: AdBlue in a diesel vehicle Plenty of modern diesels around Cowleymoor, like those in Cotteylands, carry on two fluids; the engine gets just your diesel. Its own tank keeps it, and from there it is sent to your exhaust, where spraying cleans the gas. Every tank has a filler of its own. On a lot of motors the two sit side by side under the same flap; on others the AdBlue filler is in the boot or under the bonnet. At the pump, the diesel side is topped up constantly. The AdBlue side is filled far less regularly, normally from a bottle, and usually by a person who has to stop and think where it goes. It's in the gap that the slip happens. ## How does AdBlue in your diesel tank take place around Cotteylands? It's hardly ever carelessness. Three things tend to line up. The warning comes first. As AdBlue runs low the car tells you, and if it runs out completely, your vehicle goes into limp mode. So the top-up is done in a hurry: on a drive off Higher Cotteylands before work, or in the car park at The Racehorse on the way home. Unfamiliar cars are next, too. Hire cars, new vehicles and company vehicles put their fillers in new places, and habit goes for the cap used on the old one. Third, the spout goes in: diesel filler or AdBlue one, it slides in as readily, and after the tip begins, no part halts it. The same few seconds settle it, in the middle of Cotteylands or out in Tiverton. ## Which filler is for AdBlue, and which for diesel? Check these before pouring, on a forecourt in Cotteylands or a driveway over in Bolham. Seconds, no more. - The cap. The AdBlue cap is often blue, or marked "AdBlue". The diesel cap usually isn't. Read it rather than going by where it sits. - Look at the size: the smaller filler neck is, on many motors, the AdBlue one. - 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 the filler is if it is not by your diesel cap, and the handbook says which. - Collecting a hire or company car, perhaps at the car park at Tiverton Parkway? Ask the person who drove it last before you set off, not when the light goes on. ## Keeping AdBlue out of your diesel tank when you top up For the day the warning comes on — anywhere you are in Devon — a routine to use. - Switch off once parked — level ground, engine stopped, and never rushed beside Cameron Close on the verge. - Silly as it sounds, saying "AdBlue" aloud as you unscrew the cap works — after you've located your filler and read it. - If both sit under one flap, check the diesel cap is still closed before you lift the bottle — and leave it on. - Slowly is best, through the bottle's own spout, until it is full or the bottle runs out. - Shut the cap, and look once more — confirm your diesel cap remained closed throughout. After that, start your car. Find during the second or third stage that AdBlue went into the diesel filler? That is where you stop. Do not go on to step five. ## AdBlue in the diesel tank already, in Cotteylands? The short order of things, starting with no starting your engine. Do not switch your ignition on; on plenty of diesels that alone runs the fuel pump. Thinning it with more diesel fails, since AdBlue sinks to the base rather than blending — and that is where the fuel is pulled from. Ask the attendants to help roll the vehicle clear of the pump if you are on a forecourt — the Morrisons, the Shell or somewhere else. Leave it where it is if you are on your own drive in Cotteylands. When the engine has run already, stop somewhere safe then switch the vehicle off. On the M5, under 10 miles from Cotteylands, that means the next exit. Mileage matters — a quick hop across Cotteylands is a smaller job than driving under 15 miles towards Exeter — so tell us about how far it went. ## What happens when our engineers get there around Cotteylands Outside St John's Catholic Primary School, close to Paddling Pool or on your own driveway: wherever the vehicle has stopped, our technicians come to it. Our engineers ask what was put in, roughly how much, and if it's run, because those answers determine this work and the price. Nobody sets off until you have heard our price over the phone. Next: draining, then a thorough flush of the entire system. 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. After the fuel filter is cleaned — or renewed, where needed — fresh diesel is added, and finally the car gets tested. After that our engineers start the car and confirm it runs correctly before we leave. With pumps fine on a busy forecourt and quiet enough for use outside a house at night, most jobs in which the motor has not run need roughly half an hour once our engineers are there. You pay on the day, with nothing upfront, and get a VAT invoice and an engineer report for your insurer. While we travel, take a look at your policy; plenty carry cover for misfuelling. ## About Cotteylands, briefly Cotteylands is a locality situated in a riverside setting in Devon, with an elevation of 83 metres above sea level. Cotteylands lies approximately 12.5 miles from Exeter and is part of a wider area that includes nearby places such as Tiverton and Farleigh Meadows. Cotteylands has a population of around 1094 people and predominantly consists of semi-detached housing. Cotteylands is located in the South West region of England, about 151.9 miles from London. ## AdBlue drains across Devon, Cotteylands included Throughout EX postcodes, our vans that cover Cotteylands — a small village — work the nearby places too, Collipriest and Farleigh Meadows among them. Fastest of all: give a EX16 5 postcode for the van. Shifting your car isn't necessary. Our engineers drain it where it is — a side street close to Old Heathcoat School Community Centre, a lay-by on the way to Westexe Recreation Ground, a drive. If you're close to a border, or somewhere hard to describe like the back of Wall in the Hall, ring and ask instead of assuming. ## Cotteylands motorists: the short version Always, the cap; after that, the tip. Even so AdBlue in your diesel tank? Petrol in Diesel will drain it where it is, anywhere around Devon: switch it off then ring 0333 366 0103.