--- title: AdBlue in a Diesel Tank Tranent? Read This canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/tranent-east-lothian/ location: Tranent county: East Lothian latitude: 55.944620 longitude: -2.954030 service: AdBlue in a Diesel Tank updated: 2026-10-27 --- # AdBlue in a Diesel Tank in Tranent: Why It Happens and How to Prevent It AdBlue already in the diesel tank? Then set this page aside for now, keep your ignition and engine off, and phone 0333 366 0103. Caught before the engine runs, it is normally a drain and a thorough flush, done where the car is around Tranent. If you are reading before it has happened, the remainder of this page is about why it occurs and how to make sure it does not. ## Why does AdBlue in a diesel vehicle need its own filler? Diesel feeds the engine — but plenty of newer diesels driven around Tranent and Blindwells carry a second fluid too. Your exhaust, not the motor, is where AdBlue goes: dosed into the fumes to fresh it, from a separate tank. Every tank has one filler of its own. Plenty of motors have a single flap for the two, whereas some put the AdBlue filler to the boot or under the bonnet. At the pump, the diesel side gets filled all the time. Someone who has to stop and think where it goes usually fills the AdBlue side, from a bottle, and far less frequently. The mistake lives in that gap. ## AdBlue in your diesel tank around Tranent: how it happens Seldom is it carelessness: normally three things coincide. On a drive off High Street before work, or in the car park outside Keepers Arms on the way home: that is where the hurried top-up happens. Why the rush? As AdBlue gets low your car warns you, and once it's empty, limp mode kicks in. Then the vehicle is new. A hire car, a new car or a company car puts the fillers where your last one didn't, and the hand reaches for the cap it would have used on the old one. And the bottle fits. A bottle with a spout goes into a diesel filler as easily as an AdBlue one, and so nothing stops the tip once it has started. The Heugh or the middle of Tranent: it is the same few seconds either way. ## How to tell the AdBlue filler from the diesel one Whether a Tranent forecourt or a driveway over in Preston, spend a couple of seconds on these before any goes in. - Where it sits misleads; the cap doesn't. AdBlue caps tend to be blue or carry the word "AdBlue" — diesel ones usually don't. - Check the size: the smaller neck is, on many cars, the AdBlue one. - Check inside your fuel flap: plenty of motors carry a label there showing which fuel goes where. - Cannot see it beside the diesel inlet? Then check beneath the bonnet or in your boot — the owner's manual will say where. - Check with 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 Prestonpans. ## AdBlue top-ups that never reach your diesel tank On the day the warning comes on — anywhere it is around East Lothian — a routine to follow. - Pull in on level, motor off, with time in hand — not hurried on the side of B6371. - Say "AdBlue" out loud as you unscrew the cap, after finding the AdBlue filler and read it. Daft, perhaps, yet it does the trick. - The diesel cap remains on. Where the two share a flap, make sure it's shut before lifting the bottle. - Pour slowly, using the bottle's own spout. Stop when it's full or when the bottle is empty. - Only then, start the car: close the cap, check again, and make sure your diesel cap was never opened. Discover at the second or third stage that AdBlue went in the diesel tank? That is where you stop. Step five stays out. ## AdBlue in the diesel tank already, in Tranent? Then the order of things is short. Do not start your engine. Do not switch the ignition on; on plenty of diesels that alone runs the fuel pump. Thinning it with extra diesel won't work, because AdBlue settles to the bottom instead of blending — and that is where your fuel is pulled from. Ask the staff to help roll the car away from the pump if you're on a forecourt — the Asda, the JET or anywhere else. At home around Tranent? So the vehicle stays where it is. Stop as soon as it is safe and switch off, if your motor has already run. Leave the M8 — under 15 miles out of Tranent — at the first exit. A short hop across Tranent is a smaller job than a run towards Edinburgh, under 10 miles away, so tell us about how far it went. ## When our technicians get there in Tranent, what takes place? Our van reaches your car anywhere it stopped — your own driveway, beside War Memorial, or outside the local primary school. What fluid was put in, the quantity, and whether it ran: our technicians ask because the replies decide the work and price. No one heads out before you have had the quote by phone. After that: a drain, then a full flush of the whole system. AdBlue crystallises and is corrosive to some of the metals in a fuel system, so it doesn't wash out on its own — which is why the flush counts more here than with petrol. A test comes last: before that, fresh diesel goes in, and the filter is cleaned or replaced if necessary. We don't go until it has been fired up and is running properly. If the engine has not run, most jobs take about half an hour once we are there, using pumps that are safe on a working forecourt and quiet enough to use outside a house after dark. Payment is on the day, not upfront, and you are given the documents your insurer asks for: an engineer's report and a VAT invoice. It's worth looking at your policy while we travel to you: misfuelling cover comes with many policies. ## About Tranent, for a moment Tranent is a coastal town in East Lothian, situated approximately 9 miles east of Edinburgh, with The Heugh and Meadowmill nearby. Tranent sits at an elevation of around 90 metres, overlooking the Firth of Forth. Tranent has a population of around 12,471 people, predominantly living in semi-detached housing. Tranent is located about 327 miles north of London, making it a commuter town for the nearby city of Edinburgh. ## AdBlue drains around Tranent, and East Lothian beyond Tranent is a coastal town, and our vans that cover it also work the places around it, Meadowmill and Meadowmill Cottages among them, across the EH postcode area. Fastest of all: give a EH33 1 postcode for our van. No need to shift your car. Our engineers drain it where it is — a side street near Commemoration of The Massacre of Tranent, 29 August 1797, a lay-by on the way to The Heugh, a drive. Guessing doesn't help at the back of The Fraser Centre, on a border, or somewhere awkward to pin down; phone and ask. ## In short, for Tranent drivers Always, the cap; after that, the pour. Still AdBlue in your diesel tank? Petrol in Diesel will drain it wherever it stands, wherever in East Lothian: keep the car off and phone 0333 366 0103.