--- title: Explained: AdBlue in a Diesel Tank Denvilles canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/denvilles-hampshire/ location: Denvilles county: Hampshire latitude: 50.858460 longitude: -0.965060 service: AdBlue in a Diesel Tank updated: 2026-10-03 --- # AdBlue in a Diesel Tank in Denvilles: Why It Occurs and How to Stop It Stop reading a minute if your diesel tank already has AdBlue in it: ignition off, motor off, then ring 0333 366 0103. Around Denvilles, finding it before the engine turns usually leaves draining and a full flush where it stands. If you're reading before it has happened, the remainder of this page is about why it takes place and how to make sure it does not. ## AdBlue in a diesel car, and its separate tank Plenty of newer diesels in Stockheath, as well as Denvilles, run on two liquids; the engine takes just the diesel. Your exhaust, not the motor, is where AdBlue goes: sprayed into the fumes to fresh them, from a separate tank. There's a filler on every tank. On a lot of cars the two sit side by side under the same flap; on others the AdBlue filler is in the boot or under the bonnet. The diesel side is fuelled at the petrol pump all the time. Rarely topped up, AdBlue normally goes in out of a bottle, tipped by someone who must stop and think which filler to use. The mistake grows in that gap between the two. ## Denvilles: how AdBlue in your diesel tank takes place Carelessness seldom explains it. What does is three things coming up together. 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 Nutwick Road before work, or in the car park at The Wheelwrights Arms on the way home. Then, the hand goes for the cap it knew on the old motor — since a hire car, a new vehicle or a company car places the fillers where your last one did not. A spout-topped bottle finds no resistance at a diesel filler any more than at an AdBlue one. And so the tip, after started, keeps on. The same few seconds settle it, in the middle of Denvilles or out in Warblington. ## The AdBlue filler and the diesel filler: telling them apart A couple of seconds is all the checks take — so run through them before you tip anything, on a driveway in Langstone or a forecourt in Denvilles. - Read the cap instead of going by where it sits: AdBlue ones are regularly blue or marked "AdBlue", and diesel caps usually are not. - Plenty of cars fit AdBlue the smaller filler of the two. - Lift the filler flap and check for a label — plenty of cars mark which belongs in which filler just there. - The handbook shows which it lives if the filler isn't next to the diesel cap: your boot, or under the bonnet. - Check with the person who drove it last — before you leave, not when the light comes on — when you collect a hire or company car from somewhere like the car park outside Warblington. ## AdBlue top-ups that never reach your diesel tank When the light comes on, wherever around Hampshire, follow this routine. - Switch off after you park — level ground, engine stopped, and not in a rush beside Marlborough Park on the verge. - Find the AdBlue filler, read the cap, and say the name "AdBlue" out loud while you unscrew it. It sounds silly. It works. - The diesel cap remains on. When the two sit under a flap, confirm it's closed before lifting the bottle. - Tip slowly, using the bottle's own spout. Stop when it is full or when the bottle is empty. - Before you start the car, shut the cap and look again that the diesel cap never came off. Spot at stage two or three that it's already gone into your diesel side? Then stop right there. Never go on to step five. ## Denvilles: already put AdBlue in your diesel tank? The short order of things, starting with not starting the motor. On many diesels your ignition alone runs the fuel pump, and so don't switch the vehicle on. Diluting it with more diesel fails, since AdBlue sinks to the base instead of blending — and that is where the fuel is drawn from. On a forecourt — Esso, BP or another — the attendants will usually help roll the vehicle away, when you ask. Your own drive around Denvilles is the place it stays. Where your engine has run by now, stop safely and switch the car off. Leave the A3(M) — under 3 miles out of Denvilles — at the first exit. Tell us roughly how far it went: a run towards Portsmouth, under 10 miles away, is a bigger job than a short hop across Denvilles. ## What happens when our engineers arrive around Denvilles Our van reaches the car anywhere it stopped — your own driveway, near The Stride, or outside St Alban's Church of England Aided Primary School. Which fluid went in, the quantity, and whether it ran: our technicians ask because the replies set both work and price. You get that price on the phone, before anyone heads out. Draining your tank comes next, then a full flush of your system. AdBlue crystallises and is corrosive to some of the metals in a fuel system, and so it does not wash out on its own — which is why the flush counts more with AdBlue than with petrol. Your filter is cleaned, or replaced where it needs to be; clean diesel goes in; and your car is tested. We don't go until it has been started and is running correctly. Unstarted vehicles usually mean a half-hour visit after the moment we arrive. The equipment is fine on a busy forecourt, and hushed enough for a residential street late at night. Paying happens on the day, not upfront, and you are given the paperwork an insurer wants: an engineer's report and a VAT invoice. Many insurance policies include misfuelling cover, so it's worth checking yours while we're on the way. ## About Denvilles itself Denvilles is a suburban area located on the coast of Hampshire, situated near the city of Portsmouth and close to neighbouring communities such as Warblington and Havant. Denvilles sits at a low elevation of around 17 metres above sea level, with its detached housing stock reflecting the area's residential character. Denvilles is part of the larger South East England region, within commuting distance of London at approximately 58 miles away. ## Denvilles and Hampshire: AdBlue drains across the area West Leigh and Havant are among the places around Denvilles, a residential suburb, that the same teams cover, over PO postcodes. Quote a postcode beginning PO9 2, and the van gets there fastest. Shifting the vehicle isn't necessary. A driveway, a lay-by on the way to Westleigh Park, a side street close to Havant New Station (site of): our engineers drain the car where it stands. Guessing won't help at the back of St Alban's Church, close to a border, or somewhere awkward to pin down; ring and check. ## In short, for Denvilles people Read the cap before you pour. Petrol in Diesel drains it where it stands, anywhere in Hampshire, if AdBlue has gone in the diesel tank anyway — and so leave the vehicle off and ring 0333 366 0103.