--- title: AdBlue in a Diesel Tank Blindley Heath: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/blindley-heath-surrey/ location: Blindley Heath county: Surrey latitude: 51.196950 longitude: -0.053590 service: AdBlue in a Diesel Tank updated: 2026-10-24 --- # AdBlue in a Diesel Tank in Blindley Heath: Why It Occurs and How to Prevent It If AdBlue is already in your diesel tank, stop reading for a moment: leave your engine and the ignition off and phone 0333 366 0103. Normally, when the motor has not turned, it is drained and thoroughly purged where the car sits around Blindley Heath. The rest of this page covers why it happens and how to make sure it doesn't — useful if you're reading before it has happened. ## AdBlue in a diesel vehicle, and its separate tank Many current diesels on the roads around Blindley Heath and South Godstone carry two liquids, not one. Diesel goes to the motor. Kept in a tank of its own, AdBlue is sprayed into the exhaust gas to clean it. Every tank has a filler of its own. Under one flap, side by side: that's the layout on many cars. Elsewhere, AdBlue's filler is beneath the bonnet or in the boot instead. Filling your diesel side at the petrol pump goes on all the time. The AdBlue side is filled far less often, normally from a bottle, and usually by somebody who has to stop and think where it goes. It is in the gap that the mistake happens. ## Blindley Heath: 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 completely, the car goes into limp mode. So the top-up is done in a hurry: on a drive off Sunhill Lane before work, or in the car park at Smith & Western on the way home. Then the vehicle is unfamiliar. A hire car, a new vehicle or a company car puts the fillers where your last one did not, and your hand reaches for the cap it would have used on the old one. Nothing halts 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. The same few seconds settle it, in the middle of Blindley Heath or out in Anglefield Corner. ## How to tell the AdBlue filler from the diesel one Look at these first, at a forecourt around Blindley Heath or a drive over in Horne. A few seconds, no more. - The cap. The AdBlue cap is regularly blue, or marked "AdBlue". Your diesel cap usually isn't. Read it rather than going by where it sits. - On plenty of motors, size gives it away: AdBlue gets the smaller filler neck. - A label inside the fuel flap frequently says which fuel goes where, on many vehicles. Look for it. - The handbook shows where it lives when the filler isn't next to your diesel cap: the boot, or under the bonnet. - Whoever had it before will know. Check when you collect a hire car or company car — from Godstone's car park, perhaps — not once the light comes on. ## Topping up AdBlue without it reaching your diesel tank Wherever across Surrey the light comes on, here is a routine for that day. - Switch off once parked — level ground, engine off, and not rushed beside A22 on the verge. - Find the AdBlue filler, check the cap, and speak the word "AdBlue" out loud while you unscrew it. It sounds silly. It works. - The two under one flap? Then make sure the lid on your diesel side is still closed ahead of raising the bottle. - Pour slowly, using the bottle's own spout. Stop when it's full or when the bottle is empty. - Close the cap, and look again — confirm the diesel cap remained shut throughout. Only then, start the vehicle. If at stage two or three you find you have already poured into the diesel side, stop there. Don't go on to stage five. ## Put AdBlue in the diesel tank around Blindley Heath already? Short order, then. First: your engine stays unstarted. On plenty of diesels your ignition alone runs the fuel pump, so don't switch the car on. Diluting it with extra diesel won't work, since AdBlue settles to the base rather than mixing — and that is where your fuel is sucked from. If you're at a forecourt, whether it's the Esso or the Shell, ask the staff to help roll your car clear of the petrol pump. Your own driveway around Blindley Heath is where it stays. Stop as soon as it is safe then switch off, if your engine has already run. The next exit means the place to leave if you are on the M23, under 5 miles from Blindley Heath. A short hop across Blindley Heath is a smaller job than a run towards Westminster, under 25 miles away, so tell us roughly how far it went. ## When our engineers get there around Blindley Heath, what happens? Our van reaches the vehicle wherever it has come to rest — your own driveway, near St John the Evangelist Blindley Heath, or outside St Stephen's CofE Primary School. The replies settle the work and the price, and so we ask what went in, about how much, and whether it's run. You get that quote on the phone, before anyone sets off. Draining the tank comes next, then a full flush of the system. With AdBlue that matters more than with petrol: it crystallises and is corrosive to some of the metals in a fuel system, and so it does not wash out on its own. A test is last: before that, clean diesel is added, and the fuel filter is flushed or changed if necessary. We don't leave until it has been fired up and is running correctly. If the engine hasn't run, most jobs take about half an hour once we're there, using pumps that are fine on a working forecourt and quiet enough to use outside a house after dark. Payment happens on the day, not upfront, and you receive the documents your insurer wants: an engineer's report and a VAT invoice. Plenty of insurance policies include misfuelling cover, so it is worth checking yours while we are on the way. ## About Blindley Heath and where it is Blindley Heath is a village in Surrey, situated on the riverside at an elevation of 68 metres, with semi-detached housing being the predominant type of accommodation. Blindley Heath lies approximately 21.7 miles south of London and is close to nearby places such as Anglefield Corner and Lingfield Common. Blindley Heath has a population of around 1024 residents and is characterised by its quiet, residential atmosphere. Blindley Heath is also near the town of Lingfield, which offers various amenities and services. ## Blindley Heath and Surrey: AdBlue drains across the area Whitewood and Lingfield Common are among the places around Blindley Heath, a village, that the same vans cover, throughout RH postcodes. A postcode starting RH7 6 gets the van to you fastest. Your car remains put. Draining happens right there, be it a drive, a street near Blindley Heath Horse Trials, or a layby on the way to Hunters Hill Wood. If you're near a border, or somewhere hard to describe like the back of Surrey Assembly Hall of Jehovah's Witnesses, ring and ask instead of guessing. ## For Blindley Heath people, the short version Read the cap before you tip. If AdBlue has gone in your diesel tank all the same, leave the car off then call 0333 366 0103. Petrol in Diesel empties it where it sits, anywhere around Surrey.