--- title: Explained: AdBlue in a Diesel Tank Manningtree canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/manningtree-essex/ location: Manningtree county: Essex latitude: 51.945420 longitude: 1.063780 service: AdBlue in a Diesel Tank updated: 2026-10-06 --- # Why It Occurs and How to Prevent It: AdBlue in a Diesel Tank in Manningtree AdBlue already in your diesel tank? Then set this page aside for now, keep the ignition and engine off, and call 0333 366 0103. A drain and a thorough flush, done just where the vehicle sits in Manningtree, is normally all it takes if found before your motor runs. Reading before the event? Then what follows covers how it comes about and what to prevent it ever happening. ## Why does AdBlue in a diesel car need its own filler? Plenty of modern diesels on the roads round Manningtree and New Mistley carry two liquids, not one. Diesel goes to your motor. Kept in a tank of its own, AdBlue is sprayed into the exhaust stream to clean it. There's a filler for every tank. Many of cars share a single flap for both, whereas some move the AdBlue filler to the boot or under the bonnet. At the petrol pump, your diesel side is topped up constantly. The AdBlue side is fuelled far less commonly, usually from a bottle, and normally by somebody who has to stop and think where it goes. Mistakes happen in that gap between them. ## How AdBlue in your diesel tank occurs around Manningtree Three things tend to line up, and carelessness is seldom one of them. On a drive off High Street before work, or in the car park outside The Red Lion heading home: that is where the hurried top-up happens. Why the rush? As AdBlue gets low the vehicle warns you, and if it's gone, limp mode kicks in. Then, the hand goes for the cap it knew on the old motor — because a hire car, a new car or a company car places the fillers somewhere your last one didn't. Lastly, the spout fits: diesel filler or AdBlue one, it goes in just as easily, and once the tip starts, no part halts it. Mistley or the middle of Manningtree: it takes the same few seconds in both. ## Telling the AdBlue filler from the diesel filler A few seconds is all the checks take — so run through them before you tip anything, on a drive in Mistley Heath or a forecourt in Manningtree. - The cap. The AdBlue cap is commonly blue, or marked "AdBlue". Your diesel cap normally isn't. Read it rather than going by position. - On many motors, the size tells: AdBlue gets the smaller filler neck. - A label inside the fuel flap often shows which fuel goes where, on plenty of motors. Look for it. - The handbook. If the filler isn't by your diesel cap, it's in your boot or under the bonnet, and the handbook says which. - Ask the person who drove it last — before you leave, not when the light comes on — when you collect a hire or company car from somewhere like the car park outside Mistley. ## Topping up AdBlue without it reaching your diesel tank On the day the warning appears — anywhere you are around Essex — a routine to use. - Stop somewhere level, motor off, with time in hand — not hurried on the side of Stour Street. - Silly as it sounds, saying "AdBlue" aloud as you unscrew the cap works — after you have located the filler and read it. - Both under one flap? So make sure the cap on the diesel side stays 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 once more. Make sure the diesel cap was never opened. Only then start the vehicle. Find at stage two or three that it's already gone into your diesel side? Then stop just there. Step five stays off limits. ## Manningtree: already put AdBlue in your diesel tank? Short list, then. First: your motor remains unstarted. Leave the ignition off as well, since on many diesels it by itself runs your fuel pump. Topping up with diesel won't dilute it: rather than mixing, AdBlue drops to the bottom of your tank, right where fuel is taken from. The staff at TotalEnergies, Esso Fuel or another forecourt will normally lend a hand pushing the vehicle away if you ask. Leave it where it is if you're on your own driveway around Manningtree. If the engine has already run, stop as soon as it is safe and switch off. The next exit is the place to come off if you're on the M11, under 50 miles from Manningtree. Tell us roughly how far it went: a run towards Colchester, under 10 miles away, is a bigger job than a short hop across Manningtree. ## Manningtree: what happens when our engineers arrive Wherever the vehicle has stopped, whether by Highfields Primary School, beside The Hub or on your own drive, our van travels to it. We ask what was put in, roughly how much, and if it's run, because those replies settle this work and the price. Nobody sets off until you've had the price over the phone. Next: a drain, then a full flush of the entire system. Unlike petrol, AdBlue forms crystals and attacks certain fuel-system metals, and none of it clears out by itself. Hence it matters more. Filter flushed or, where it must be, replaced; fresh diesel in; then a test of the car. Next our technicians start the engine and confirm it runs correctly before we go. Most jobs are done in about half an hour once our engineers get there, provided your motor has not run — and the pumps our engineers use are fine on a live forecourt and quiet at night outside a house. You pay on the day, with nothing upfront, and get a VAT invoice and an engineer report for your insurer. Misfuelling cover is part of plenty of insurance policies — so use the wait to look at yours. ## About Manningtree, briefly Manningtree is a small town on the coast of Essex, situated near the River Stour and close to the nearby villages of Mistley and Lawford. Manningtree has a population of around 5869 people and is characterized by its semi-detached housing stock. Manningtree sits at a low elevation of around 8 metres above sea level, looking out over the estuary towards the North Sea. Manningtree is located near the city of Colchester, which is approximately 8 miles away. ## AdBlue drains round Manningtree, and Essex beyond Manningtree is a coastal town, and our teams that cover it also work the towns around it, Cattawade and Lawford among them, across the CO postcode area. A postcode starting CO11 1 gets our van to you fastest. The vehicle remains where it is. A driveway, a lay-by on the way to Welcome Home Field, a side street near Manningtree Library: we drain the car where it is. Assuming won't help at the back of Manningtree Museum, close to a border, or somewhere awkward to describe; phone and ask. ## For Manningtree drivers, the short version Before you pour, read the cap. AdBlue in your diesel tank regardless? Leave the vehicle switched off then call 0333 366 0103; Petrol in Diesel empties it where it stands, across Essex.