--- title: Explained: AdBlue in a Diesel Tank Long Ditton canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/long-ditton-surrey/ location: Long Ditton county: Surrey latitude: 51.384370 longitude: -0.319590 service: AdBlue in a Diesel Tank updated: 2026-10-28 --- # Preventing AdBlue in a Diesel Tank in Long Ditton: Why It Happens Pause reading for a moment if the diesel tank already has AdBlue in it: ignition off, engine off, and ring 0333 366 0103. A drain plus a thorough flush, done right where your car stands around Long Ditton, is normally what it takes when found before your engine runs. Nothing happened yet? Further down, the page covers the reasons it takes place and the ways to prevent it for good. ## Why does AdBlue in a diesel vehicle need its own filler? Plenty of current diesels on the roads round Long Ditton and Thames Ditton carry two liquids, not one. Diesel goes to your motor. Stored in a tank of its own, AdBlue is sprayed into your exhaust stream and cleans it. Every tank has one filler of its own. Under one flap, next to each other: that's the arrangement on many cars. On others, AdBlue's filler is beneath the bonnet or in the boot instead. The diesel side is filled at the pump all the time. The AdBlue side is filled far less often, normally from a bottle, and usually by a person who has to stop and think where it goes. The mistake grows in the gap between the two. ## AdBlue in the diesel tank in Long Ditton: how it occurs Carelessness rarely causes it. What does is three things lining up together. On a drive off Fleece Road before work, or in the car park at British Legion heading home: that's where the hurried top-up happens. Why the rush? As AdBlue runs low the car warns you, and if it's gone, limp mode kicks in. Then, your hand goes for the cap it knew on the old car — since a hire car, a new car or a company car puts the fillers somewhere your last one didn't. Third, the spout goes in: diesel filler or AdBlue filler, it goes in just as easily, and once the tip begins, no part halts it. The same few seconds settle it, in the middle of Long Ditton or out in Giggshill. ## The AdBlue filler and the diesel filler: telling them apart Check these first, on a forecourt around Long Ditton or a driveway out in Hinchley Wood. A few seconds, that's all. - Colour and marking: an AdBlue cap is often blue, or says "AdBlue", where a diesel cap usually does not. Go by the cap, not its position. - Plenty of cars fit AdBlue the smaller filler of the two. - Open the filler flap and check for a label — many vehicles show which goes in which inlet just there. - Cannot find it beside the diesel filler? Then check below the bonnet or in the boot — the handbook says where. - The person who drove it last. On a hire or company car picked up from somewhere like the car park outside Surbiton, ask before you leave, not when the light comes on. ## Topping up AdBlue without it reaching the diesel tank Wherever around Surrey the light comes on, this is a routine for the day. - Stop on level, motor off, with time in hand — never hurried on the side of Ewell Road. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds silly and it works. - If both sit under one flap, check your diesel cap is still closed before you lift the bottle — then leave the vehicle on. - Pour slowly, using the bottle's own spout. Stop when it's full or when the bottle is empty. - Close the cap and check a second time. Make sure your diesel cap was never opened. Only then start the car. Find at stage two or three that it's already gone into your diesel side? Then stop right there. Never go on to step five. ## Already put AdBlue in your diesel tank in Long Ditton? The short order of things, starting with no starting the engine. On plenty of diesels the ignition alone runs the fuel pump, so do not switch the car on. AdBlue doesn't mix with diesel — it sinks to the bottom of that tank, where the fuel is drawn from — so don't top up with diesel to thin it. Ask the attendants to help push the car clear of the pump if you're at a forecourt — the Shell, the JET or anywhere else. If you're on your own drive around Long Ditton, leave it where it stands. If the engine has already run, stop as soon as it is safe and switch off. Long Ditton sits under 5 miles from the M25; there, take the next exit. A short hop across Long Ditton is a smaller job than a run towards Westminster, under 15 miles away, so tell us roughly how far it went. ## Long Ditton: what happens when our engineers arrive Wherever your car came to rest, be it outside Long Ditton St Mary's CofE (Aided) Junior School, beside St Mary's Church, Long Ditton or at home, the van travels to it. The answers settle the work and our quote, so our engineers ask what went in, about how much, and whether it's run. You hear that price on the phone, before anyone sets off. After that: draining, then a thorough flush of the entire system. AdBlue crystallises and is corrosive to some of the metals in a fuel system, and so it doesn't wash out on its own — which is why the flush matters more here than with petrol. Testing is last: before that, clean diesel is added, and your filter is flushed or replaced if necessary. Then our engineers start the engine and confirm it runs properly before leaving. If the engine hasn't run, most jobs take about half an hour once we are there, using pumps that are safe on a busy forecourt and quiet enough to use outside a house after dark. Nothing in advance; you settle up that day. At the end, a VAT invoice and the report from the engineer are handed to you for your insurer. Plenty of insurance policies include misfuelling cover, and so it's worth checking yours while we're on the way. ## About Long Ditton, for a moment Long Ditton is a village in Surrey, situated on the riverside with an elevation of around 16 metres, and is located near the neighbouring areas of Giggshill and Southborough. Long Ditton has a mix of housing types, but semi-detached homes are the most predominant, and it is close to the larger urban area of London, being approximately 11.9 miles away. Long Ditton is a relatively small community with a population of around 2950 residents. Long Ditton benefits from its proximity to Westminster, which is about 11.6 miles away. ## AdBlue drains around Long Ditton, and Surrey beyond As a village, Long Ditton has the same vans as nearby areas — Southborough, Seething Wells — all the way across KT postcodes and the surrounding area around them. Give a postcode beginning KT6 5, and our van arrives quickest. Your car stays where it is. The drain happens on the spot, whether a driveway, a road by Malden and District Society of Model Engineers Ltd, or a lay-by towards Long Ditton Recreation Ground. Tricky to explain, like the back of Hinchley Wood Church Hall? Close to a border? Asking is better than guessing, and so ring. ## In short, for Long Ditton motorists Always, the cap; then, the tip. Even so AdBlue in your diesel tank? Petrol in Diesel can drain it wherever it stands, wherever across Surrey: switch the vehicle off and call 0333 366 0103.