--- title: Explained: AdBlue in a Diesel Tank Doversgreen canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/doversgreen-surrey/ location: Doversgreen county: Surrey latitude: 51.218060 longitude: -0.196460 service: AdBlue in a Diesel Tank updated: 2026-10-04 --- # Why It Occurs and How to Avoid It: AdBlue in a Diesel Tank in Doversgreen If AdBlue is already in your diesel tank, stop reading for a moment: leave the motor and your ignition off and ring 0333 366 0103. A drain and a full flush, carried out right where the vehicle stands in Doversgreen, is normally all it takes if caught before your engine runs. Nothing happened yet? Below, the page explains the why it occurs and the ways to prevent it for good. ## Two fillers, two tanks: AdBlue in a diesel vehicle Many newer diesels in South Park, like those in Doversgreen, run on two fluids; your engine gets only your diesel. Kept in a tank of its own, AdBlue is fed into the exhaust gas to clean it. Each tank has its own filler. Some motors keep the AdBlue filler in your boot or under the bonnet; plenty of others have both together behind one flap. The diesel side is fuelled at the pump all the time. Far less often, the AdBlue side gets topped up — normally from a bottle, by a person working out where it goes. It is in that gap that the mistake lives. ## How AdBlue in the diesel tank occurs in Doversgreen It is seldom carelessness. Three things tend to line up. Haste comes from the warning. The vehicle tells you as AdBlue runs low, and a dry tank sends the vehicle into limp mode — so the top-up gets done in a rush, before work on a drive off Delamere Road, or heading home in the car park outside The Beehive. Then, the hand goes for the cap it knew on the old vehicle — because a hire car, a new vehicle or a company car puts the fillers where your last one did not. And the bottle fits. A bottle with a spout goes into a diesel filler as easily as an AdBlue one, so nothing stops the pour once it has started. Whether it takes place in Woodhatch or the middle of Doversgreen, it's the same few seconds. ## How to tell the AdBlue filler from the diesel one A couple of seconds is all the checks take — so check them before you tip anything, on a driveway in St Johns or a forecourt around Doversgreen. - Check the cap instead of going by position: AdBlue ones are frequently blue or marked "AdBlue", and diesel caps normally are not. - Look at the size: the smaller filler neck is, on plenty of motors, the AdBlue one. - The flap. Look inside your fuel flap for a label. Plenty of cars say there which fuel goes where. - Cannot find it next to your diesel filler? Then look below the bonnet or in the boot — the owner's manual will say where. - The person who drove it last. On a hire or company car picked up from somewhere like the car park at Earlswood (Surrey), ask before you leave, not when the light comes on. ## Topping up AdBlue without it reaching your diesel tank On the day the light comes on — wherever it is in Surrey — a simple routine to follow. - Park and switch off. Not on a slope, not with your motor running, and not in a rush on the side of Lonesome Lane. - Daft as it sounds, saying "AdBlue" aloud as you unscrew the cap works — once you have located the filler and read it. - The two behind one flap? Then confirm the cap on your diesel side stays shut before lifting the bottle. - Using the bottle's own spout, tip slowly — and stop when it's full or the bottle is empty. - Before starting the vehicle, shut the cap and check again that the diesel cap never came off. Spot at step two or three that it's already gone into your diesel side? Then stop just there. Never carry on to step five. ## Put AdBlue in your diesel tank around Doversgreen already? Do not start your engine: that is where the short order of things starts. The fuel pump starts on plenty of diesels as soon as your ignition goes on — and so keep it off. Diluting it with extra diesel won't work, because AdBlue sinks to the bottom instead of blending — and that's where your fuel is sucked from. If you're on a forecourt, whether it's the Texaco or the Shell, ask the attendants to help roll the car clear of the petrol pump. On your own drive in Doversgreen? So the car remains put. If the motor has already run, stop as soon as it is safe and switch off. The next exit is where to come off if you are on the M25, under 3 miles from Doversgreen. About how far did it go? Crossing Doversgreen is less work than a trip of under 25 miles to Westminster, and so say. ## What occurs when our technicians get there in Doversgreen Anywhere your car came to rest, whether by Dovers Green School, near Sandcross Church or on your own drive, the van comes to it. Both the work and the quote depend on three answers — what fluid, which quantity, and whether it's run — so our technicians ask. Nobody heads out before you've heard the price over the phone. Draining your tank comes next, then a thorough flush of the fuel system. More than with petrol, it counts with AdBlue: the crystals build up, certain metals are attacked, and nothing clears away on its own, no matter how long it sits. A test comes last: before that, clean diesel is added, and your filter is cleaned or replaced if necessary. We do not go until it has been started and is running smoothly. Most jobs are done in about half an hour after our engineers get there, provided the motor hasn't run — and the pumps our engineers use are fine on a live forecourt and quiet at night outside a house. Nothing upfront; you settle up that day. At the end, a VAT invoice and a report from the engineer go to you for the insurer. Wrong-fuel cover is part of many insurance policies — so make use of the wait to look at yours. ## About Doversgreen itself Doversgreen is a suburban area in Surrey, situated near the riverside with an elevation of around 65 metres. Doversgreen lies approximately 20 miles south of London, near the neighbouring communities of Woodhatch, Mead Vale, and Sidlow. Doversgreen has a population of around 3924 residents, predominantly living in semi-detached housing. Doversgreen is also relatively close to Westminster, being about 19.8 miles away from the city. ## AdBlue drains round Doversgreen, and Surrey beyond Throughout RH postcodes, the teams that cover Doversgreen — a residential suburb — work the surrounding places too, Sidlow and Mead Vale included. The van reaches you fastest with a postcode starting RH2 7. The vehicle remains where it is. A driveway, a lay-by on the way to Hartswood Sports Ground, a side street near Woodhatch Community Centre: our technicians drain the vehicle where it sits. If you're near a boundary, or somewhere hard to explain like the back of Reigate Baptist Church, ring and ask instead of assuming. ## Doversgreen people: the short version Tip no AdBlue until you have read the cap. Petrol in Diesel empties it on the spot, anywhere across Surrey, if AdBlue has gone in your diesel tank all the same — so leave it off and ring 0333 366 0103.