--- title: Explained: AdBlue in a Diesel Tank Chelsfield canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/chelsfield-greater-london/ location: Chelsfield county: Greater London latitude: 51.357270 longitude: 0.106720 service: AdBlue in a Diesel Tank updated: 2026-10-27 --- # How It Occurs and How to Prevent It: AdBlue in a Diesel Tank in Chelsfield AdBlue already in the diesel tank? In that case put this page down for now, keep the ignition and engine off, then phone 0333 366 0103. Caught before your motor runs, it is normally a drain and a thorough flush, done where the vehicle is in Chelsfield. The rest of this page explains why it happens and how to make sure it doesn't — useful if you're reading ahead of time. ## Two fillers, two tanks: AdBlue in a diesel car Plenty of modern diesels on the roads around Chelsfield and Pratts Bottom carry two liquids, not one. Diesel goes to your motor. AdBlue's own tank keeps it, and from there it goes to the exhaust, where a spray cleans the gas. There is a filler on each tank. Plenty of motors share a single flap for both, whereas others put the AdBlue filler to the boot or under the bonnet. Diesel goes in at every filling station call-out, week in, week out. The AdBlue side is fuelled far less frequently, normally from a bottle, and normally by someone who has to stop and think where it goes. Mistakes happen in that gap between the two. ## AdBlue in your diesel tank in Chelsfield: how it takes place Three things tend to come together, and carelessness is rarely one of them. To start with, the warning. Low AdBlue triggers a warning from the car, and letting it run dry means limp mode — hence a hurried top-up, maybe before work off Warren Road, perhaps outside The Chelsfield on the way home after work. Next, your hand reaches for the cap it knew on the old car — because a hire car, a new car or a company car puts the fillers somewhere your last one didn't. No part stops the tip after it has started, because a bottle with a spout goes into a diesel filler as readily as an AdBlue one. The bottle fits. Green Street Green or the heart of Chelsfield: it is the same few seconds either way. ## Which filler is for AdBlue, and which for diesel? Before you pour anything, whether on a drive in Orpington or a forecourt in Chelsfield, check these. They take a couple of seconds. - Read the cap rather than going by where it sits: AdBlue caps are often blue or marked "AdBlue", and diesel ones usually are not. - Many vehicles fit AdBlue the smaller filler of the two. - A label inside your fuel flap frequently says which fuel goes where, on many cars. Check for it. - Cannot see it next to the diesel filler? Then look below the bonnet or in the boot — the handbook says where. - Whoever had it before will know. Ask as you collect a rental or fleet car — at the nearest station's car park, perhaps — not when the light appears. ## AdBlue top-ups that never reach the diesel tank Anywhere across Greater London the light comes on, here is a routine for that day. - Not in a rush on the side of Station Approach, not on a slope, not with your engine running: park then switch off properly. - Find the AdBlue filler, check the cap, and speak the name "AdBlue" out loud as unscrewing it. It seems daft. It does the trick. - The two behind one flap? So confirm the cap on the diesel side is still closed before 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 again. Make sure the diesel cap was never opened. Only then start the vehicle. Discover during the second or third stage that AdBlue went in the diesel tank? That's where you stop. Stage five is out. ## Chelsfield: already put AdBlue in your diesel tank? Brief list, then. Top of that: the engine remains unstarted. Don't switch your ignition on; on many diesels that alone runs the fuel pump. Filling up with diesel won't thin it: rather than mixing, AdBlue sinks to the bottom of that tank, just where fuel is drawn from. The attendants at BP, Texaco or another forecourt will normally help pushing the vehicle clear when asked. On your own drive in Chelsfield? So the car stays where it is. Where the engine has run already, pull over safely then switch it off. On the M25, under 3 miles from Chelsfield, that means the next junction. Distance counts — a quick hop across Chelsfield makes a smaller job than heading under 15 miles towards London — so say about how far it went. ## What takes place when we get there in Chelsfield Outside The Highway Primary School, near John Hugh Mortimer Ellis or on your own driveway: wherever the vehicle has stopped, we come to it. Our technicians ask what got in, roughly how much, and if it has run, since the answers decide this work and the quote. That quote is given over the phone, before any van leaves. Then the tank is drained and the fuel system cleaned thoroughly. Much more than with petrol, it matters with AdBlue: the crystals form, certain metals corrode, and nothing washes away unaided, no matter how long it is left. After your filter has been cleaned — or replaced, where required — clean diesel goes in, and then the vehicle is tested. After that our technicians fire it up and make sure it runs properly before we leave. Unstarted cars mostly need a half-hour job after arrival. The equipment is fine on a live filling station, and quiet enough for a driveway after dark. Nothing upfront; you settle up that day. At the end, the VAT invoice and a report from the engineer go to you for the insurer. Many insurance policies include misfuelling cover, and so it is worth checking yours while we're on the way. ## About Chelsfield, briefly Chelsfield is a suburban area in the London Borough of Bromley, situated approximately 14.5 miles from central London. Chelsfield sits at an elevation of around 105 metres, with nearby places including Green Street Green, Ramsden, and Goddington. Chelsfield has a population of around 4612 people, predominantly living in semi-detached housing. Chelsfield is characterized by its residential streets and local amenities. ## AdBlue drains across Greater London, Chelsfield included Ramsden and Goddington are among the places around Chelsfield, a residential suburb, that the same vans cover, over BR postcodes. A postcode starting BR6 9 gets the van to you fastest. Your car stays where it is. Our technicians drain it where it is — a side street near Christ Church, a lay-by on the way to Chelsfield Woods, a driveway. If you are close to a boundary, or somewhere hard to describe like the back of Orpington Bowls Club, ring and ask rather than assuming. ## The short version for Chelsfield motorists Tip no AdBlue till you have read the cap. Petrol in Diesel empties it where it stands, anywhere around Greater London, if AdBlue has gone in the diesel tank all the same — so leave the car off then call 0333 366 0103.