--- title: AdBlue in a Diesel Tank Chignall Smealy? Read This canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/chignall-smealy-essex/ location: Chignall Smealy county: Essex latitude: 51.778610 longitude: 0.415800 service: AdBlue in a Diesel Tank updated: 2026-10-28 --- # Chignall Smealy: How Does AdBlue End Up in a Diesel Tank, and How Do You Prevent It? If AdBlue is already in your diesel tank, stop reading for a moment: leave your engine and your ignition off and ring 0333 366 0103. A drain plus a full flush, carried out just where your car sits around Chignall Smealy, is usually what it takes if found before the engine runs. If you are reading before it has happened, the remainder of this page is about why it takes place and how to make sure it doesn't. ## AdBlue in a diesel motor: two tanks, two fillers Many modern diesels on the roads round Chignall Smealy and Breeds carry two liquids, not one. Diesel goes to your engine. AdBlue's own tank keeps it, and from there it is sent to your exhaust, where a spray treats the gas. Different tanks, separate fillers. On a lot of vehicles the two sit side by side under the same flap; on others the AdBlue filler is in your boot or under the bonnet. Diesel goes in at every forecourt call-out, again and again. Much less frequently, 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 error lives. ## How does AdBlue in the diesel tank happen around Chignall Smealy? It's hardly ever carelessness. Three things tend to line up. The warning comes first. As AdBlue runs low the vehicle tells you, and if it runs out altogether, the car drops into limp mode. So the top-up is done in a hurry: on a drive off Chignal Road before work, or in the car park outside Pig and Whistle on the way home. Then, the hand reaches for the cap it would have used on the old vehicle — because a hire car, a new vehicle or a company car places the fillers somewhere your last one did not. Nothing stops the tip after it has started, since a bottle with a spout goes into a diesel filler as easily as an AdBlue one. The bottle fits. Whether it takes place in Fanners Green or the middle of Chignall Smealy, it is the same few seconds. ## Telling the AdBlue filler from the diesel filler Check these before pouring, at a forecourt in Chignall Smealy or a driveway over in High Houses. A few seconds, that's all. - Check the cap instead of going by position: AdBlue caps are frequently blue or marked "AdBlue", and diesel ones normally are not. - The size. On plenty of motors the AdBlue filler neck is the smaller of the two. - A label inside your fuel flap often says which fuel goes where, on many vehicles. Look for it. - The handbook. If your filler isn't by the diesel cap, it is in your boot or under the bonnet, and the handbook says which. - The person who drove the car last. On a hire or company car collected from somewhere like the car park outside Chelmsford, ask before you leave, not when the light comes on. ## How to top up without AdBlue in the diesel tank When the light goes on, anywhere in Essex, use this routine. - Switch off once parked — level ground, motor off, and never in a rush by Breeds Road at the roadside. - Silly as it sounds, speaking "AdBlue" aloud while you unscrew the cap does the trick — once you've found your filler and read the cap. - Both behind one flap? So confirm the lid on your diesel filler stays 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 check again. Make sure the diesel cap was never opened. Only then start the vehicle. If at stage two or three you find you have already poured into your diesel side, stop there. Never go on to stage five. ## Chignall Smealy: already put AdBlue in the diesel tank? Then the order of things is short. Do not start the motor. The fuel pump runs on plenty of diesels the moment your ignition goes on — so keep it off. Thinning it with more diesel won't work, because AdBlue sinks to the bottom instead of blending — and that's where the fuel is pulled from. Ask the attendants to help roll your car away from the pump if you are at a forecourt — the BP, the Applegreen UK or anywhere else. At home around Chignall Smealy? So the car stays where it is. Already run? Pull over when it is sensible, then switch off. Come off the M11 — under 15 miles out of Chignall Smealy — at the first exit. About how far did it go? Crossing Chignall Smealy is less work than a run of under 5 miles towards Chelmsford, and so tell us. ## When we get there around Chignall Smealy, what happens? Our engineers come to the vehicle wherever it has stopped, whether that's outside Great Waltham Church of England Voluntary Controlled Primary School, close to St Nicholas' Church, Chignall Smealy or on your own driveway. Those replies determine this work and the quote, so our engineers ask what went in, roughly how much, and whether it has run. You get that quote on the phone, before anyone heads out. Emptying your tank comes next, followed by a full flush of the fuel 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 that matters more with AdBlue than with petrol. After your filter has been cleaned — or replaced, where required — clean diesel goes in, and then the vehicle gets tested. After that our technicians fire it up and check it runs properly before we go. With pumps safe on a busy forecourt and quiet enough for use outside a house at night, most jobs where your motor hasn't run need about half an hour after we are there. Nothing in advance; you settle up that day. Afterwards, the VAT invoice and the report from the engineer are handed to you for your insurer. Wrong-fuel cover is included in plenty of insurance policies — so make use of the wait to check yours. ## About Chignall Smealy and where it is Chignall Smealy is a small hamlet in Essex, situated inland at an elevation of around 55 metres, and is located near the city of Chelmsford. Chignall Smealy lies within a short distance of other nearby places, including Fanners Green, Mashbury, and Chignall St James. Chignall Smealy is characterized by its predominantly detached housing stock, reflecting its rural setting. Chignall Smealy is also relatively close to London, at a distance of approximately 29.9 miles. ## AdBlue drains across Essex, Chignall Smealy included Chignall Smealy is a rural hamlet, and our vans that cover it also work the towns near it, Mashbury and Chignall St James among them, across the CM postcode area. Quickest of all: quote a CM1 4 postcode for the van. Your car remains where it is. Anywhere it sits — near Chignal Chapel, on a lay-by en route to Hoddock's Wood, at home — that's where it is drained. Ring and ask rather than assuming if you're close to a boundary, or somewhere hard to explain, like the back of St James, Chignal St James (private dwelling). ## In short, for Chignall Smealy motorists Read the cap before you pour. Petrol in Diesel drains it on the spot, anywhere in Essex, if AdBlue has gone in your diesel tank all the same — so leave the car off and ring 0333 366 0103.