--- title: AdBlue in a Diesel Tank Buntingford? Read This canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/buntingford-hertfordshire/ location: Buntingford county: Hertfordshire latitude: 51.945360 longitude: -0.017630 service: AdBlue in a Diesel Tank updated: 2026-10-13 --- # Preventing AdBlue in a Diesel Tank in Buntingford: Why It Occurs If AdBlue is already in your diesel tank, stop reading for a moment: leave the motor and your ignition off then call 0333 366 0103. Caught before your engine runs, it's normally a drain and a thorough flush, done where the car is around Buntingford. Reading before the event? In that case the rest explains how it happens and what to stop it happening at all. ## AdBlue in a diesel car, and its separate tank Many modern diesels around Westmill, as well as Buntingford, run on two fluids; your engine gets only the diesel. AdBlue goes to your exhaust, where it is sprayed into the gas to clean it, and it lives in a tank of its own. There's a filler for every tank. 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 on each filling station call-out, week in, week out. Seldom filled, AdBlue usually goes in from a bottle, tipped by a driver who must stop and think what filler to use. Mistakes happen in the gap between the two. ## How AdBlue in the diesel tank takes place around Buntingford Carelessness rarely causes it. What does is three things coming up at once. To start with, the warning. Low AdBlue triggers a warning from your car, and running out leads to limp mode — so a hurried top-up, perhaps before work off Station Road, perhaps at The Jolly Sailors on the way home that evening. New-to-you vehicles come next, as well. Rentals, new vehicles and company motors place their fillers in new places, and the hand goes for the cap it 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, so nothing stops the tip after it has started. The same few seconds settle it, in the middle of Buntingford or out in Newtown. ## Telling the AdBlue filler from your diesel filler A couple of seconds is all the checks take — so run through them before you tip anything, on a driveway in Hare Street or a forecourt around Buntingford. - Check the cap rather than going by where it sits: AdBlue ones are frequently blue or marked "AdBlue", and diesel ones usually are not. - The size. On plenty of cars the AdBlue filler neck is the smaller of the two. - Open the flap and look for a label — many motors mark what goes in each inlet right there. - In your boot or under the bonnet: that's where the filler is if it is not by the diesel cap, and the handbook says which. - The person who drove the vehicle last. On a hire or company car collected from somewhere like the car park outside Ashwell & Morden, ask before you leave, not when the light comes on. ## Topping up AdBlue without it reaching the diesel tank The day the light goes on, wherever around Hertfordshire, follow this routine. - Not in a rush on the side of High Street, not on a slope, not with the motor running: park then switch off properly. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds daft and it does the trick. - The two behind one flap? Then confirm the lid on the diesel filler is still shut ahead of raising the bottle. - Gently does it, through the bottle's own spout, till it is full or the bottle runs out. - Close the cap, and check again — making sure the diesel filler stayed closed the whole time. After that, start your car. Discover during the second or third step that AdBlue went in the diesel tank? That's where you stop. Don't go on to stage five. ## Already put AdBlue in the diesel tank around Buntingford? Brief list, then. Top of that: your motor remains off. The fuel pump runs on plenty of diesels as soon as your ignition is switched on — and so leave it off. Thinning it with extra diesel won't work, because AdBlue settles to the base rather than mixing — and that is where the fuel is pulled from. The attendants at Esso, BP or another forecourt will usually lend a hand pushing the vehicle clear if you ask. On your own drive around Buntingford? Then the vehicle stays put. Stop as soon as it is safe then switch off, if the motor has already run. Come off the A1(M) — under 10 miles out of Buntingford — at the first exit. Mileage counts — a quick hop across Buntingford is a smaller job than driving under 25 miles to Cambridge — so say roughly how far it went. ## What takes place when we arrive around Buntingford Our technicians come to your car wherever it has stopped, whether that's outside Millfield First and Nursery School, near St Richard of Chichester or on your own drive. Which fluid went in, the quantity, and whether it ran: our technicians ask because the replies set both work and quote. Nobody sets off before you've had the price over the phone. Emptying your tank comes next, then a thorough flush of your system. AdBlue crystallises and is corrosive to some of the metals in a fuel system, so it does not wash out on its own — which is why the flush counts more here than with petrol. The filter flushed or, where needed, replaced; clean diesel in; then a test of your vehicle. The engine is fired up next and checked to make sure it runs correctly, all before our technicians go. Most jobs are finished in about half an hour once our technicians arrive, provided your motor has not run — and the pumps we use are safe on a live forecourt yet 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. It is worth checking your policy as the van travels to you: misfuelling cover comes with many policies. ## About Buntingford, briefly Buntingford is a town situated in the eastern part of Hertfordshire, on the banks of the River Rib, at an elevation of around 91 metres. Buntingford lies approximately 30 miles north of London and is close to the city of Cambridge, which is about 19 miles away. Buntingford has a mix of housing types, but semi-detached homes are particularly prevalent in the area. Buntingford is surrounded by smaller settlements, including Newtown, Aspenden, and Wyddial. ## Buntingford and Hertfordshire: AdBlue drains across the area Buntingford is a riverside town, and our teams that cover it also work the towns near it, Aspenden and Wyddial among them, across the SG postcode area. A postcode starting SG9 9 gets the van to you fastest. There's no need to move the vehicle. Our technicians drain it where it is — a side street near St Peter, a lay-by on the way to Layston Court Gardens, a drive. Ring and ask instead of guessing if you're near a boundary, or somewhere hard to describe, like the back of Seth Ward Community Centre. ## Buntingford people: the short version Read the cap before you pour. If AdBlue has gone in your diesel tank anyway, leave the car off and ring 0333 366 0103. Petrol in Diesel drains it where it sits, anywhere in Hertfordshire.