--- title: AdBlue in a Diesel Tank Wymering: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/wymering-hampshire/ location: Wymering county: Hampshire latitude: 50.848330 longitude: -1.073850 service: AdBlue in a Diesel Tank updated: 2026-10-21 --- # Wymering: How Does AdBlue End Up in a Diesel Tank, and How Do You Prevent It? If AdBlue is already in your diesel tank, stop reading for a moment: leave the engine and your ignition off and call 0333 366 0103. Caught before your engine runs, it is usually a drain and a thorough flush, done where your car is around Wymering. The remainder of this page explains why it occurs and how to make sure it doesn't — handy if you're reading before it has happened. ## AdBlue in a diesel motor, and its separate tank No single liquid but two: that is what plenty of newer diesels around Wymering and Port Solent carry, with diesel for your motor. Stored in a tank of its own, AdBlue is sprayed into the exhaust stream and cleans it. Every tank has one filler of its own. Some cars put the AdBlue filler in your boot or under the bonnet; plenty of others place both together behind one flap. Diesel goes in on every filling station call-out, again and again. Seldom topped up, AdBlue normally comes from a bottle, poured by a driver who has to stop and think what filler it needs. It is in the gap that the mistake lives. ## Wymering: how AdBlue in your diesel tank takes place Carelessness seldom causes it. What does is three things coming up together. To start with, the warning. Low AdBlue brings a warning from your car, and running dry leads to limp mode — so a hurried top-up, maybe before work off Sevenoaks Road, perhaps at The Red Lion on the way home that evening. Then, the hand goes for the cap it would have used on the old motor — since a hire car, a new motor or a company car places the fillers somewhere your last one did not. And the bottle fits. A bottle with a spout goes into a diesel filler as easily as an AdBlue one, and so nothing stops the pour after it has started. Cosham or the heart of Wymering: it is the same few seconds either way. ## How to tell the AdBlue filler from the diesel one Whether a Wymering forecourt or a driveway out in Vicarage Row, spend a few seconds over these before any is poured in. - Read the cap rather than going by where it sits: AdBlue ones are frequently blue or marked "AdBlue", and diesel caps usually are not. - The size. On plenty of cars the AdBlue filler neck is the smaller of the two. - A label inside the fuel flap often shows which fuel goes where, on many cars. Check for it. - Can't find it next to your diesel filler? In that case look below the bonnet or inside the boot — the owner's manual will say which. - The previous driver will know. Ask when you collect a hire car or company car — at Cosham's car park, perhaps — not when the warning appears. ## AdBlue top-ups that never reach your diesel tank On the day the light appears — wherever it is across Hampshire — a simple routine to use. - Park then switch off. Not on a slope, not with your engine running, and not in a rush on the side of Pasteur Road. - Daft as it sounds, speaking "AdBlue" aloud while you unscrew the cap does the trick — after you've found your filler and read the cap. - Leave the diesel cap on. If both sit under one flap, check the diesel cap is still closed before you lift the bottle. - Tip slowly, using the bottle's own spout. Stop when it is full or when the bottle is empty. - Before starting the vehicle, shut the cap and check again that the diesel cap was never opened off. Stop there if you find, at step two or three, that you have already poured into the diesel side. Step five stays out. ## Put AdBlue in the diesel tank around Wymering already? The short order of things, beginning with not starting your engine. Leave the ignition off as well, since on many diesels it by itself runs your fuel pump. AdBlue does not mix with diesel — it sinks to the bottom of your tank, where the fuel is drawn from — so don't top up with diesel to dilute it. At a forecourt — Esso, Shell or another — the staff will usually help roll your car clear, if you ask. Leave it where it is if you're on your own drive around Wymering. Already started? Pull over when it is sensible, then switch off. The next exit is where to come off if you're on the M275, under a mile from Wymering. Distance matters — a short hop across Wymering makes a smaller job than heading under 5 miles towards Portsmouth — so tell us roughly how far it went. ## When our technicians get there in Wymering, what takes place? Our van comes to the vehicle wherever it stopped — your own drive, beside Saint Peter and Saint Paul, or by Portsdown Primary School. We ask what got in, about how much, and whether it has run, since those replies decide this work and the quote. No one sets off before you've heard the price over the phone. Your system is then purged thoroughly, once the tank is emptied. Much more than with petrol, it counts with AdBlue: crystals build up, some metals corrode, and none of that clears away on its own, no matter how long it sits. The filter is flushed, or replaced where it needs to be; clean diesel goes in; and the vehicle is tested. We do not leave until it has been started and is running properly. If your engine has not run, the majority of jobs take about half an hour once we're there, using pumps that are safe on a working forecourt and quiet enough to use outside a house at night. No money upfront; you settle up on the day. At the end, a VAT invoice and a report from the engineer are handed to you for the insurer. It is worth checking your insurance as the van travels to you: misfuelling cover is included with many policies. ## About Wymering itself Wymering is a suburban area located on the southern coast of England, in the county of Hampshire, with Wymering sitting approximately 21 metres above sea level. Wymering is situated near the city of Portsmouth, with Wymering being around 3.6 miles from the city centre. Wymering has a mix of housing types, but semi-detached homes are the most predominant, with Wymering being close to other nearby places such as Cosham and Paulsgrove. ## AdBlue drains round Wymering, and Hampshire beyond Wymering is a residential suburb, and our teams that cover it also work the towns near it, Highbury and Paulsgrove among them, across the PO postcode area. A postcode starting PO6 3 gets the van to you fastest. Shifting the vehicle isn't needed. Our technicians drain it where it is — a side street close to Cosham Library, a lay-by on the way to King George V Playing Fields, a drive. Tricky to explain, like the back of Horizon Health and Fitness Club? Close to a county line? Asking beats guessing, so phone. ## The short version for Wymering motorists Pour nothing until you've read the cap. If AdBlue has gone in the diesel tank regardless, leave the vehicle off then call 0333 366 0103. Petrol in Diesel empties it where it waits, anywhere across Hampshire.