--- title: AdBlue in a Diesel Tank New Malden? Read This canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/new-malden-greater-london/ location: New Malden county: Greater London latitude: 51.400210 longitude: -0.255680 service: AdBlue in a Diesel Tank updated: 2026-10-26 --- # Why It Occurs and How to Prevent It: AdBlue in a Diesel Tank in New Malden If AdBlue is already in your diesel tank, stop reading for a moment: leave your motor and your ignition off then call 0333 366 0103. A drain and a thorough flush, done right where the vehicle stands in New Malden, is usually what it takes when caught before your engine runs. Not happened yet? Below, the page covers the why it happens and the how to avoid it for good. ## Two fillers, two tanks: AdBlue in a diesel motor Diesel feeds your motor — yet plenty of newer diesels driven round New Malden and Raynes Park carry a second fluid as well. Your exhaust, not your engine, is where AdBlue ends up: sprayed into the fumes to fresh it, from a separate tank. Separate tanks, different fillers. Under one flap, next to each other: that is the arrangement on many motors. On others, AdBlue's filler sits beneath the bonnet or in the boot instead. At the petrol pump, the diesel side gets filled constantly. Someone who has to stop and work out where it goes normally tops up the AdBlue side, from a bottle, and far less often. Mistakes happen in the gap between them. ## New Malden: how AdBlue in the diesel tank happens It's hardly ever carelessness. Three things tend to line up. The warning comes first. As AdBlue runs low the vehicle tells you, and if it runs out completely, your vehicle drops into limp mode. So the top-up is done in a hurry: on a driveway off Blagdon Road before work, or in the car park outside The Watchman on the way home. Next, your hand goes for the cap it knew on the old car — since a rental car, a new vehicle or a company car places the fillers somewhere your last one did not. Third, the bottle fits: diesel filler or AdBlue one, it goes in just as readily, and once the pour begins, no part stops it. West Barnes or the middle of New Malden: it is the same few seconds in both. ## Telling the AdBlue filler from your diesel filler Be it a New Malden forecourt or a drive over in Coombe, spend a few seconds on these before any goes in. - Read the cap instead of going by position: AdBlue ones are often blue or marked "AdBlue", and diesel ones usually aren't. - On plenty of cars, the size tells: AdBlue has the smaller filler neck. - The flap. Look inside your fuel flap for a label. Plenty of vehicles say there which fuel goes where. - The handbook shows which it is when your filler isn't next to your diesel cap: the boot, or under the bonnet. - The person who drove it last. On a hire or company car picked up from somewhere like the car park at the nearest station, ask before you leave, not when the light comes on. ## Topping up AdBlue without it reaching your diesel tank A routine for the day the light comes on, wherever around Greater London that is. - Not in a rush on the side of Sussex Place, not on a slope, not with the engine running: park then switch off properly. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds silly and it does the trick. - Both behind one flap? Then make sure the cap on your diesel side stays closed ahead of lifting the bottle. - Using the bottle's own spout, tip slowly — and stop when it is full or the bottle is empty. - Close the cap, and check once more — confirm the diesel cap stayed shut the whole time. After that, start the vehicle. Stop there if you find, at stage two or three, that you've already poured into your diesel side. Don't go on to step five. ## New Malden: already put AdBlue in your diesel tank? Don't start your engine: that is how the short order of things begins. On plenty of diesels your ignition alone runs the fuel pump, and so don't switch it on. Diluting it with extra diesel fails, because AdBlue sinks to the bottom instead of mixing — and that's where your fuel is pulled from. The attendants at BP, Esso or another forecourt will normally help pushing the vehicle away when asked. On your own drive around New Malden? So the vehicle remains put. When the motor has run by now, stop somewhere safe and switch the car off. On the M4, under 10 miles from New Malden, that means the next junction. Mileage matters — a short hop across New Malden is a smaller job than heading under 10 miles towards Westminster — so tell us roughly how far it went. ## When our technicians turn up in New Malden, what happens? Wherever your car came to rest, be it by Burlington Junior School, beside Korean Culture & Arts Centre or on your own drive, our van travels to it. Our technicians ask what got in, roughly how much, and whether it's run, since the answers decide the work and the quote. Nobody heads out until you've heard the quote by phone. Draining that tank comes next, followed by a full flush of the fuel system. More than with petrol, it counts with AdBlue: the crystals build up, certain metals corrode, and none of it washes away on its own, however long it is left. Your filter is flushed, or replaced where it needs to be; clean diesel goes in; and the vehicle is tested. Then we start the engine and check it runs properly before we go. Unstarted cars usually mean a half-hour visit from the moment we arrive. The equipment is fine on a live forecourt, and hushed enough for a driveway late at night. Paying happens on the day, not upfront, and you are given the paperwork an insurer asks for: an engineer's report and a VAT invoice. Before we get there, take a look at your insurance documents; many carry cover for misfuelling. ## About New Malden New Malden is a locality in the Royal Borough of Kingston upon Thames, situated on the riverside in southwest London. New Malden lies close to the Hogsmill River and is surrounded by other localities such as West Barnes, Motspur Park, and Old Malden. New Malden is characterized by its predominantly flat-type housing and is approximately 9 miles from central London. New Malden has a population of around 5744 residents. ## New Malden and Greater London: AdBlue drains across the area Motspur Park and Old Malden are among the towns near New Malden, a small village, that the same vans cover, throughout KT postcodes. A postcode starting KT3 4 gets the van to you fastest. The vehicle doesn't need to move. Our engineers drain it where it is — a side street near Memorial Gardens, a lay-by on the way to Blagdon Road Recreation Ground, a driveway. If you are close to a border, or somewhere hard to describe like the back of Kingston Environment Centre, ring and ask rather than assuming. ## The short version for New Malden motorists First, the cap; after that, the tip. AdBlue in the diesel tank regardless? Keep the vehicle switched off and phone 0333 366 0103; Petrol in Diesel empties it where it stands, across Greater London.