--- title: AdBlue in a Diesel Tank Clerkenwater: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/clerkenwater-cornwall/ location: Clerkenwater county: Cornwall latitude: 50.484290 longitude: -4.728950 service: AdBlue in a Diesel Tank updated: 2026-10-08 --- # Preventing AdBlue in a Diesel Tank in Clerkenwater: Why It Happens AdBlue already in the diesel tank? In that case set this page down a moment, keep your ignition and motor off, and phone 0333 366 0103. Caught before the motor runs, it's generally a drain and a thorough flush, done where your car is around Clerkenwater. The rest of this page explains why it takes place and how to ensure it does not — useful if you are reading ahead of time. ## AdBlue in a diesel car: two tanks, two fillers Diesel goes to the engine — but many current diesels driven around Clerkenwater and Cooksland carry another liquid as well. Kept in a tank of its own, AdBlue is fed into the exhaust stream and cleans it. There's a filler on each tank. Plenty of motors have a single flap for both, whereas others put the AdBlue filler to your boot or under the bonnet. Filling the diesel side at the petrol pump goes on all the time. Someone who has to stop and think where it goes usually fills the AdBlue side, from a bottle, and much less commonly. That gap is where the error lives. ## AdBlue in your diesel tank in Clerkenwater: how it happens Carelessness seldom causes it. Instead is three things lining up together. To start with, the warning. Low AdBlue triggers a message from the car, and letting it run dry leads to limp mode — hence a rushed top-up, perhaps before work off Higher Bodiniel Road, or outside The White Hart Inn on the way home that evening. The old car's cap is where the hand goes — yet a rental car, a new vehicle or a company car keeps the fillers somewhere else. That's the second factor: a new motor. A spouted bottle meets no resistance at a diesel filler any more than at an AdBlue one. So the tip, once begun, keeps on. Bodiniel or the heart of Clerkenwater: it takes the same few seconds either way. ## How to tell the AdBlue filler from the diesel one Before you pour anything, whether on a drive in Dunmere or a forecourt in Clerkenwater, check these. They take a few seconds. - Where it sits can mislead; the cap doesn't. AdBlue caps are often blue or bear the word "AdBlue" — diesel caps usually don't. - Many vehicles give AdBlue the smaller neck of the two. - Look inside the fuel flap: many vehicles have a label there saying which fuel goes where. - The handbook. If your filler is not by the diesel cap, it is in your boot or under the bonnet, and the handbook says which. - Picking up a hire or company car, perhaps at the car park outside Bodmin Parkway? Check with the person who drove the vehicle last before you set off, rather than once the light comes on. ## Topping up AdBlue without it reaching your diesel tank Wherever across Cornwall the light comes on, here is a routine for that day. - Not in a rush on the side of Clerkenwater Bridge, not on a slope, not with your motor running: park and switch off first. - Say "AdBlue" out loud as you unscrew the cap, after finding the AdBlue filler and read it. Silly, yes, yet it works. - If both sit under one flap, check the diesel cap is still closed before you lift the bottle — then leave the car on. - Stop once that tank fills or the bottle is empty; until then, tip slowly using the built-in spout. - Shut the cap, then look once more — making sure the diesel cap stayed closed the whole time. Only then, start the car. Stop there if you find, at stage two or three, that you have already poured into the diesel side. Skip step five altogether. ## Put AdBlue in the diesel tank around Clerkenwater already? Short list, then. First: your motor remains unstarted. On many diesels the ignition alone runs the fuel pump, so don't switch the car on. Do not top up with diesel to thin it: AdBlue doesn't mix with diesel, it sinks to the bottom of your tank, where the fuel is pulled from. If you're on a forecourt, whether it's the Texaco or the Asda, ask the staff to help roll your car clear of the pump. If you're on your own driveway in Clerkenwater, leave the car where it sits. Stop as soon as it is safe and switch off, if the engine has already run. Clerkenwater sits over 50 miles from the M5; on it, use the first exit. Tell us about how far it went: a run towards Truro, under 25 miles away, is a bigger job than a short hop across Clerkenwater. ## Clerkenwater: what takes place when we turn up The van comes to the vehicle wherever it stopped — your own drive, beside Kingdom Hall of Jehovahs Witnesses, or outside Berrycoombe School. Both the work and our quote rest on three answers — what liquid, what amount, and if it's run — so our engineers ask. No one heads out until you have heard the price over the phone. Then that tank is emptied and the fuel system rinsed thoroughly. AdBlue crystallises and is corrosive to some of the metals in a fuel system, so it does not wash out on its own — which is why the flush matters more here than with petrol. The filter is flushed, or replaced where it needs to be; clean diesel goes in; and your car is tested. Before we leave, we fire it up and confirm that it's running properly. Unstarted cars usually mean a half-hour job after the moment we arrive. The equipment is safe on a busy forecourt, and quiet enough for a driveway after dark. Paying happens on the day, not upfront, and you are given the documents your insurer asks for: an engineer's report and a VAT invoice. It's worth checking your policy while we travel to you: misfuelling cover comes with plenty of policies. ## About Clerkenwater Clerkenwater is a locality situated in a riverside setting in Cornwall, with an elevation of 114 metres above sea level. Clerkenwater lies near the towns of Bodiniel and Bodmin, and is approximately 20.8 miles from the city of Truro. Clerkenwater has a population of around 561 people, predominantly living in detached housing. Clerkenwater is located in the South West region of England, about 212.2 miles from London. ## Clerkenwater and Cornwall: AdBlue drains across the area Town End and Bodmin are among the places near Clerkenwater, a small village, that the same teams cover, throughout PL postcodes. Our van reaches you fastest with a postcode starting PL31 2. No need to shift your car. A drive, a lay-by on the way to Tredanek Meadow, a side street near Bodmin Jail: we drain the vehicle where it is. Ring and ask rather than guessing if you are close to a border, or somewhere hard to describe, like the back of Bodmin Christian Felowship. ## In short, for Clerkenwater drivers Always, the cap; after that, the tip. Petrol in Diesel empties it where it stands, anywhere across Cornwall, if AdBlue has gone in your diesel tank anyway — so leave the vehicle off and call 0333 366 0103.