--- title: AdBlue in a Diesel Tank Blunsdon St Andrew: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/blunsdon-st-andrew-wiltshire/ location: Blunsdon St Andrew county: Wiltshire latitude: 51.606640 longitude: -1.798960 service: AdBlue in a Diesel Tank updated: 2026-10-16 --- # Why It Occurs and How to Avoid It: AdBlue in a Diesel Tank in Blunsdon St Andrew Keep your motor and ignition off then phone 0333 366 0103 first — reading can wait if AdBlue is already in your diesel tank. A drain and a full flush, carried out just where your car stands in Blunsdon St Andrew, is normally all it needs when found before the engine runs. Reading before the event? Then what follows explains how it comes about and how to stop it ever happening. ## Why does AdBlue in a diesel motor need its own filler? Plenty of newer diesels in Hyde, like those in Blunsdon St Andrew, run on two fluids; your motor takes just your diesel. Kept in a tank of its own, AdBlue is fed into your exhaust stream and cleans it. Each tank has its own filler. Plenty of motors have a single flap for the two, while some move the AdBlue filler to your boot or under the bonnet. Diesel gets filled on each filling station visit, again and again. Someone who has to stop and work out where it goes normally tops up the AdBlue side, from a bottle, and far less frequently. It's in that gap that the mistake happens. ## How does AdBlue in the diesel tank occur in Blunsdon St Andrew? Three things tend to come together, and carelessness is rarely one of them. The warning comes first. As AdBlue runs low the vehicle tells you, and if it runs out altogether, your vehicle drops into limp mode. So the top-up is done in a hurry: on a drive off Salzgitter Drive before work, or in the car park at The Jovial Monk on the way home. Then the car is unfamiliar. A hire car, a new vehicle or a company car puts the fillers where your last one did not, and your hand hits for the cap it would have used on the old one. Lastly, the spout fits: a diesel filler or AdBlue one, it goes in as readily, and once the pour starts, no part stops it. Whether it occurs in St Andrews Ridge or the middle of Blunsdon St Andrew, it's the same few seconds. ## How to tell the AdBlue filler from the diesel one Whether a Blunsdon St Andrew forecourt or a drive over in Broad Blunsdon, spend a couple of seconds over these before any is poured in. - Colour and lettering: an AdBlue cap is often blue, or says "AdBlue", where a diesel cap normally does not. Trust the cap, not its position. - The size. On many motors the AdBlue filler neck is the smaller of the two. - The flap. Look inside your fuel flap for a label. Plenty of vehicles say there which fuel goes where. - The handbook shows where it is if your filler isn't next to your diesel cap: the boot, or under the bonnet. - Whoever had it before will know. Ask when you pick up a rental or fleet car — at Swindon's car park, say — not when the light comes on. ## Topping up AdBlue without it reaching the diesel tank Wherever in Wiltshire the light comes on, here is a routine for that day. - Not in a rush on the side of Thornhill Drive, not on a slope, not with the motor running: park and switch off properly. - Silly as it sounds, saying "AdBlue" aloud while you unscrew the cap works — after you have found your filler and read it. - The two behind a single flap? So make sure the cap on the diesel filler stays closed before raising the bottle. - Tip slowly, using the bottle's own spout. Stop when it is full or when the bottle is empty. - Before starting the car, shut the cap and check a second time that your diesel cap was never opened off. Spot at step two or three that it's already gone into your diesel side? Then stop right there. Leave out step five altogether. ## Blunsdon St Andrew: already put AdBlue in the diesel tank? Brief list, then. Top of that: your engine stays unstarted. Don't switch your ignition on; on many diesels that alone runs the fuel pump. Filling up with diesel will not weaken it: instead, AdBlue sinks to the base of the tank, just where the fuel is taken from. If you're on a forecourt, whether it is the Asda or the BP, ask the staff to help push the vehicle clear of the petrol pump. Your own drive in Blunsdon St Andrew is the place it stays. When the motor has been run already, stop safely and switch the car off. Blunsdon St Andrew lies under 5 miles from the M4; there, take the next junction. Distance matters — a quick hop across Blunsdon St Andrew is a smaller job than heading under 50 miles towards Oxford — so say about how far it went. ## Our arrival in Blunsdon St Andrew, and what happens next Anywhere the car came to rest, be it outside Abbey Farm Educate Together Primary, beside Blunsdon Abbey or on your own drive, the van travels to it. Which liquid got in, the quantity, and if it ran: our engineers ask since those replies set the work and price. On the call itself, you hear our price — ahead of anything else. Then the tank is cleared and the system rinsed thoroughly. Much more than with petrol, it matters here: crystals form, certain metals are attacked, and nothing washes away unaided, no matter how long it is left. Filter cleaned or, where it must be, swapped; fresh diesel in; and then a test of the vehicle. Before leaving, our engineers fire it up and confirm that it is running correctly. Using pumps safe on a busy forecourt and quiet enough for use outside a house at night, most jobs in which the motor has not run take about half an hour after our engineers are there. Payment happens on the day, not upfront, and you are given the documents an insurer wants: an engineer's report and a VAT invoice. Before we get there, have a look at your insurance documents; many carry cover for misfuelling. ## About Blunsdon St Andrew Blunsdon St Andrew is a village situated in north Wiltshire, on the banks of the River Thames, with St Andrews Ridge and Ash Brake nearby. Blunsdon St Andrew has a mix of old and new housing, predominantly detached homes, and is located about 25 miles from Oxford. Blunsdon St Andrew sits at an elevation of 143 metres, in a scenic area with nearby Abbey Meads. Blunsdon St Andrew is a relatively small community, with a population of around 3556 residents. ## AdBlue drains around Blunsdon St Andrew and across Wiltshire Blunsdon St Andrew is a village, and our vans that cover it also work the places near it, Ash Brake and Abbey Meads among them, across the SN postcode area. Fastest of all: quote a SN25 4 postcode to our van. There's no need to shift the car. Our technicians drain it where it is — a side street close to Groundwell Ridge Roman Site, a lay-by on the way to Diamond Jubilee Park, a driveway. Tricky to explain, like the back of St Andrews Church? Close to a border? Checking beats assuming, so ring. ## The short version for Blunsdon St Andrew drivers Read the cap before you pour. AdBlue in your diesel tank regardless? Keep the vehicle off then ring 0333 366 0103; Petrol in Diesel drains it on the spot, across Wiltshire.