--- title: AdBlue in a Diesel Tank Swallownest: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/swallownest-south-yorkshire/ location: Swallownest county: South Yorkshire latitude: 53.362420 longitude: -1.324680 service: AdBlue in a Diesel Tank updated: 2026-10-28 --- # Why It Happens and How to Avoid It: AdBlue in a Diesel Tank in Swallownest Keep the motor and ignition off then call 0333 366 0103 now — reading can wait when AdBlue is already in your diesel tank. In Swallownest, catching it before the engine runs normally means a drain and a full flush where it stands. Nothing happened yet? Below, the page explains the reasons it happens and the ways to avoid it for good. ## AdBlue in a diesel motor: two tanks, two fillers Many newer diesels in Waleswood, as well as Swallownest, run on two fluids; the engine gets only your diesel. Stored in a tank of its own, AdBlue is fed into your exhaust gas and cleans it. There is a filler on every tank. On a lot of motors the two sit side by side under the same flap; on others the AdBlue filler is in your 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 much less regularly. It's in the gap that the mistake lives. ## How does AdBlue in the diesel tank take place around Swallownest? It is rarely carelessness. Three things tend to line up. Haste comes from the warning. The car tells you as AdBlue runs low, and an empty tank sends it into limp mode — so the top-up happens in a rush, before work on a drive off Rotherham Road, or on the way home in the car park at Roland Arms. Then the vehicle is strange. A hire car, a new vehicle or a company car puts the fillers where your last one did not, and your hand gets to for the cap it would have used on the old one. No part stops the pour once it has started, because a bottle with a spout goes into a diesel filler as readily as an AdBlue one. The bottle fits. Aughton or the middle of Swallownest: it is the same few seconds in both. ## The AdBlue filler and the diesel filler: telling them apart Before you tip anything, whether on a driveway in Woodhouse Mill or a forecourt around Swallownest, check these. They take a few seconds. - Colour and marking: an AdBlue cap is regularly blue, or says "AdBlue", where a diesel cap normally does not. Trust the cap, not where it sits. - On many vehicles, size tells: AdBlue gets the smaller filler neck. - Check inside the fuel flap: plenty of vehicles carry a label there showing which fuel goes where. - The handbook shows where it is if the filler isn't next to your diesel cap: the boot, or under the bonnet. - Check with the person who drove it last — before you leave, not when the light comes on — when you pick up a hire or company car from somewhere like the car park at Woodhouse. ## How to top up without AdBlue in your diesel tank A routine for the day the light comes on, wherever in South Yorkshire that is. - Not in a rush on the side of Chesterfield Road, not on a slope, not with your engine running: park and switch off first. - Silly as it sounds, saying "AdBlue" aloud while you unscrew the cap works — once you've found your filler and read the cap. - The diesel cap remains on. Where the two share a flap, make sure it's shut before lifting the bottle. - Gently does it, through the bottle's own spout, till it's full or the bottle is empty. - Close the cap and check again. Make sure the diesel cap was never opened. Only then start the car. Discover at the second or third step that the bottle went into the wrong filler? That's where you stop. Skip step five entirely. ## Put AdBlue in your diesel tank in Swallownest already? Don't start your motor: that's how the short order of things starts. The fuel pump starts on many diesels the moment your ignition goes on — so keep it off. AdBlue does not mix with diesel — it sinks to the bottom of the tank, where your fuel is sucked from — so do not top up with diesel to thin it. The attendants at BP, another forecourt nearby or another forecourt will normally lend a hand pushing your car clear when asked. On your own drive in Swallownest? Then the vehicle stays put. Already run? Stop once it's sensible, then switch off. The next junction is where to leave if you are on the M1, under 3 miles from Swallownest. Roughly how far did it go? Crossing Swallownest is smaller a job than a run of under 10 miles to Sheffield, so say. ## When we get there around Swallownest, what occurs? Wherever the car came to rest, whether outside Swallownest Primary School, near Swallownest Community Centre or at home, the van travels to it. Which liquid went in, the amount, and whether it ran: our engineers ask since the replies set the work and quote. You hear that quote on the phone, before anyone heads out. Your system is then cleaned thoroughly, after your tank is emptied. Unlike petrol, AdBlue leaves crystals and attacks some fuel-system metals, and neither clears away unaided. That is why it counts more. The filter is cleaned, or replaced where it needs to be; fresh diesel goes in; and the vehicle is tested. Before leaving, we fire it up and make sure that it's running smoothly. Most jobs are finished in roughly half an hour after our technicians arrive, provided the engine hasn't run — and the pumps our technicians use are fine on a live forecourt and quiet at night beside a house. Nothing upfront; you settle up that day. At the end, the VAT invoice and the report from the engineer are handed to you for your insurer. While we travel, take a look at your insurance documents; plenty include cover for misfuelling. ## About Swallownest and where it is Swallownest is a village in South Yorkshire, situated approximately 6 miles southeast of Sheffield, and is characterized by its predominantly detached housing stock. Swallownest sits at an elevation of around 83 metres, in a gently sloping area of the county. Swallownest is close to nearby places such as Aughton, Beighton, and Aston, and is home to a population of around 2601 residents. Swallownest is located inland, about 137.7 miles north of London. ## Swallownest and South Yorkshire: AdBlue drains across the area Swallownest is a rural village, and the vans that cover it also work the towns near it, Beighton and Aston among them, across the S postcode area. Quickest of all: quote a S26 4 postcode for the van. Shifting the vehicle isn't needed. We drain it where it is — a side street close to Christ Church Swallownest, a lay-by on the way to Lodge Lane Park, a drive. Awkward to explain, like the back of Swallownest Baptist Church? Close to a border? Checking is better than assuming, and so phone. ## Swallownest drivers: the short version Read the cap before you pour. AdBlue in the diesel tank regardless? Leave it off and ring 0333 366 0103; Petrol in Diesel empties it where it stands, throughout South Yorkshire.