--- title: AdBlue in a Diesel Tank Wandsworth? Read This canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/wandsworth-greater-london/ location: Wandsworth county: Greater London latitude: 51.456770 longitude: -0.192740 service: AdBlue in a Diesel Tank updated: 2026-10-07 --- # Wandsworth: How Does AdBlue End Up in a Diesel Tank, and How Do You Prevent It? AdBlue already in your diesel tank? Then set this page aside a moment, leave your ignition and motor off, and call 0333 366 0103. A drain plus a full flush, done right where your car sits in Wandsworth, is normally all it takes if found before your motor runs. The rest of this page explains why it occurs and how to ensure it doesn't — handy if you're reading ahead of time. ## Why does AdBlue in a diesel motor need its own filler? Many newer diesels around Earlsfield, like those in Wandsworth, run on two liquids; your motor takes only your diesel. AdBlue goes to your exhaust, where it is sprayed into the gas to clean it, and it lives in a tank of its own. There's a filler for each tank. Plenty of vehicles share a single flap for the two, whereas some put the AdBlue filler to the boot or under the bonnet. At the petrol pump, the diesel side is topped up constantly. Far less commonly, the AdBlue side is filled — mostly from a bottle, by someone thinking about where it goes. Mistakes happen in the gap between them. ## Wandsworth: how AdBlue in your diesel tank occurs Seldom is it carelessness: normally three things coincide. The warning comes first. As AdBlue runs low your car tells you, and if it runs out altogether, your vehicle drops into limp mode. So the top-up is done in a hurry: on a driveway off Wandsworth High Street before work, or in the car park outside The Ram Inn on the way home. The old car's filler is where the hand reaches — yet a rental car, a new vehicle or a company car puts the fillers somewhere else. That's a second thing: a strange vehicle. 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 once it has started. It's a few seconds, be it in The Mews or right in the centre of Wandsworth. ## How to tell the AdBlue filler from the diesel one Before you tip anything, whether on a driveway in Putney or a forecourt in Wandsworth, check these. They take a couple of seconds. - Where it sits can mislead; the cap doesn't. AdBlue ones are often blue or bear the name "AdBlue" — diesel caps usually do not. - On many cars, size tells: AdBlue gets the smaller filler neck. - A label inside the fuel flap often shows which fuel goes where, on many motors. Look for it. - The handbook says which it lives if your filler is not next to the diesel cap: your boot, or under the bonnet. - Picking up a hire or company car, say at the car park at Wandsworth Town? Check with whoever drove the car last before leaving, rather than once the light comes on. ## How to top up without AdBlue in the diesel tank On the day the light appears — wherever it is around Greater London — a routine to use. - Not in a rush on the side of Ram Street, not on a slope, not with the motor running: park and switch off properly. - Silly as it sounds, speaking "AdBlue" aloud while you unscrew the cap works — after you've found the filler and read the cap. - The two behind one flap? Then confirm the cap on the diesel side is still shut ahead of raising the bottle. - Tip slowly, using the bottle's own spout. Stop when it's full or when the bottle is empty. - Close the cap, then look once more — making sure your diesel cap stayed closed throughout. Only then, start the vehicle. If at step two or three you find you have already poured into the diesel side, stop there. Stage five stays out. ## Wandsworth: already put AdBlue in the diesel tank? Do not start your motor: that's where the short order of things begins. The fuel pump starts on many diesels the moment your ignition is switched on — and so keep it off. Thinning it with more diesel fails, since AdBlue sinks to the bottom rather than blending — and that's where your fuel is drawn from. Ask the attendants to help push the car away from the pump if you're at a forecourt — the BP, the Shell or somewhere else. Your own driveway in Wandsworth is the place it stays. When your engine has been run by now, stop safely and turn the vehicle off. On the M4, under 5 miles from Wandsworth, that means the next junction. About how far did it go? Hopping across Wandsworth is smaller work than a run of under 5 miles to Westminster, and so say. ## When our engineers get there in Wandsworth, what occurs? The van comes to your car anywhere it stopped — your own driveway, beside Sambrook's Brewery Heritage Centre & Beershop, or outside Anglo Portuguese School of London. Our engineers ask what got in, roughly how much, and if it has run, because the replies determine this work and the price. The quote comes on the call, before any van leaves. Emptying the tank comes next, then a full flush of your system. More than with petrol, it matters with AdBlue: the crystals build up, certain metals corrode, and none of it clears away unaided, however long it sits. Your filter is flushed, or replaced where it needs to be; clean diesel goes in; and the car is tested. We do not leave until it has been started and is running properly. Unstarted vehicles usually need a half-hour visit after arrival. The equipment is safe on a busy forecourt, and hushed enough for a driveway after dark. Your insurer usually wants an engineer's report and the VAT invoice, and you get both once the job is done. Payment is on the day, with no money upfront. Misfuelling cover is included in many insurance policies — so use the wait to check yours. ## About Wandsworth and where it is Wandsworth is a locality in south London, situated on the River Thames at an elevation of around 12 metres. Wandsworth lies close to several neighbouring areas, including The Mews, Southfields, and Clapham Junction, and is approximately 4.5 miles from central London. Wandsworth is predominantly composed of flat dwellings, housing a population of around 9466 residents. Wandsworth benefits from its riverside setting, with views across the Thames towards the city. ## Wandsworth and Greater London: AdBlue drains across the area As a small village, Wandsworth has the same vans as nearby places — Southfields, Clapham Junction — all the way across SW postcodes and the surrounding area beyond. Quickest of all: quote a SW18 4 postcode for the van. There's no need to move your car. Anywhere it sits — near Flow 63, in a lay-by en route to Garratt Lane Old Burial Ground, on a drive — that's where it gets cleared. Ring and ask instead of guessing if you're near a border, or somewhere hard to describe, like the back of Quaker Meeting House. ## For Wandsworth motorists, the short version Before you pour, read the cap. Still AdBlue in your diesel tank? Petrol in Diesel will drain it where it stands, anywhere across Greater London: switch it off and call 0333 366 0103.