--- title: Explained: AdBlue in a Diesel Tank Sticker canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/sticker-cornwall/ location: Sticker county: Cornwall latitude: 50.316910 longitude: -4.840270 service: AdBlue in a Diesel Tank updated: 2026-10-26 --- # Why It Occurs and How to Avoid It: AdBlue in a Diesel Tank in Sticker If AdBlue is already in your diesel tank, stop reading for a moment: leave the motor and the ignition off and call 0333 366 0103. Normally, when your motor has not run, it is drained and fully flushed where the car is in Sticker. The remainder of this page explains why it happens and how to make sure it doesn't — handy if you are reading ahead of time. ## Two fillers, two tanks: AdBlue in a diesel car Many newer diesels in Hewas Water, as well as Sticker, carry on two liquids; the engine takes just your diesel. AdBlue's own tank holds it, and from there it is sent to your exhaust, where a spray cleans the fumes. Separate tanks, separate fillers. Other vehicles put the AdBlue filler in your boot or under the bonnet; plenty of others have the two together under one flap. Filling the diesel side at the petrol pump goes on constantly. Much less commonly, the AdBlue side gets topped up — normally from a bottle, by someone thinking about where it goes. The mistake grows in the gap between them. ## How AdBlue in the diesel tank happens around Sticker Carelessness seldom explains it. What does is three things lining up together. On a drive off Fore Street before work, or in the car park outside Hewas Inn on the way home: that's where the hurried top-up takes place. Why the rush? As AdBlue runs low the vehicle tells you, and once it is gone, limp mode follows. Unfamiliar cars are second, too. Rentals, new vehicles and company cars put their fillers differently, and the hand reaches for the cap used on the old one. Lastly, the spout goes in: a diesel filler or AdBlue one, it goes in as easily, and after the pour begins, nothing stops it. Lower Sticker or the heart of Sticker: it is the same few seconds in both. ## The AdBlue filler and your diesel filler: telling them apart Before you pour anything, whether on a driveway in Little Polgooth or a forecourt in Sticker, check these. They take a few seconds. - Check the cap instead of going by where it sits: AdBlue ones are frequently blue or marked "AdBlue", and diesel ones usually aren't. - On plenty of vehicles, size tells: AdBlue has the smaller filler neck. - Check inside the fuel flap: plenty of cars carry a label there showing which fuel goes where. - Cannot find it beside your diesel inlet? Then check below the bonnet or inside the boot — the owner's manual says where. - The person who drove the vehicle last. On a hire or company car picked up from somewhere like the car park at St Austell, ask before you leave, not when the light comes on. ## Keeping AdBlue out of your diesel tank when you top up Wherever across Cornwall the light comes on, this is a routine for the day. - Turn off after you park — flat ground, engine off, and not in a rush by St Stephens Road on the verge. - Say "AdBlue" out loud as you unscrew the cap, after finding the AdBlue filler and read it. Silly, yes, but it does the trick. - If both sit under one flap, check the diesel cap is still closed before you lift the bottle — then leave the car on. - Slowly does it, through the bottle's own spout, until it's full or the bottle is empty. - Only then, start the car: close the cap, check a second time, and make sure your diesel cap was never opened. Discover at the second or third step that the bottle went into the wrong tank? That is where you stop. Do not go on to stage five. ## Put AdBlue in your diesel tank in Sticker already? What follows is a short order of things, starting with no starting your motor. Do not switch the ignition on; on many diesels that alone runs the fuel pump. Diluting it with more diesel fails, because AdBlue settles to the base instead of blending — and that's where your fuel is drawn from. On a forecourt — EG On the Go, Texaco or another — the attendants will normally help push the car away, when you ask. Leave it where it is if you are on your own driveway around Sticker. Stop as soon as it is safe and switch off, if your engine has already run. On the M5, over 50 miles from Sticker, that means the next junction. Tell us roughly how far it went: a run towards Truro, under 15 miles away, is a bigger job than a short hop across Sticker. ## What happens when our engineers turn up around Sticker Our van reaches the vehicle anywhere it stopped — your own driveway, beside St Mark Mission Church, or outside St Mewan Community Primary School. The answers decide this work and our price, and so our technicians ask what got in, about how much, and if it's run. Nobody heads out until you've had our price over the phone. The system is then flushed thoroughly, after that tank is emptied. With AdBlue that matters more than with petrol: it crystallises and is corrosive to some of the metals in a fuel system, so it does not wash out on its own. The fuel filter is flushed, or replaced where it needs to be; clean diesel goes in; and the vehicle is tested. Next our engineers start the engine and check it runs properly before we leave. Most jobs are done in roughly half an hour after our engineers get there, as long as your engine has not run — and the pumps we use are safe on a busy forecourt and quiet at night outside a house. The insurer will ask for the engineer's report and your VAT invoice, and both are yours at the end. Payment is on the day, with no money upfront. Many insurance policies include misfuelling cover, and so it is worth checking yours while we're on the way. ## About Sticker itself Sticker is a small village in Cornwall, situated inland at an elevation of 83 metres, approximately 10 miles from the city of Truro. Sticker has a population of around 819 people and is characterised by predominantly detached housing. Sticker is located near other small settlements such as Lower Sticker, Paramoor, and Trelowth, in the Cornish countryside. Sticker is about 221 miles west of London, in the South West region of England. ## AdBlue drains across Cornwall, Sticker included Paramoor and Trelowth are among the places around Sticker, a rural village, that the same teams cover, throughout PL postcodes. The van gets to you fastest with a postcode starting PL26 7. No need to shift your car. Draining takes place on the spot, whether a drive, a street near Polgooth Methodist Church, or a lay-by on the way to Paramoor Wood. Assuming won't help at the back of Polgooth Village Hall, close to a boundary, or somewhere awkward to pin down; ring and check. ## For Sticker motorists, the short version Before you tip, read the cap. If AdBlue has gone in the diesel tank all the same, leave the car off and ring 0333 366 0103. Petrol in Diesel empties it where it stands, anywhere in Cornwall.