--- title: Bishopdown: AdBlue in a Diesel Tank, Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/bishopdown-wiltshire/ location: Bishopdown county: Wiltshire latitude: 51.083830 longitude: -1.781690 service: AdBlue in a Diesel Tank updated: 2026-10-04 --- # AdBlue in a Diesel Tank in Bishopdown: Why It Occurs and How to Avoid It If AdBlue is already in your diesel tank, stop reading for a moment: leave the motor and your ignition off and phone 0333 366 0103. Caught before your engine runs, it's usually a drain and a thorough flush, done where the car is around Bishopdown. If you are reading before it has happened, the remainder of this page is about why it happens and how to make sure it does not. ## AdBlue in a diesel vehicle, and its separate tank Diesel feeds the engine — yet many newer diesels seen round Bishopdown and Ford hold a second liquid as well. AdBlue goes to the exhaust, where it is sprayed into the gas to fresh it, and it lives in a tank of its own. There is a filler on each tank. On a lot of motors the two sit side by side under the same flap; on others the AdBlue filler is in the boot or under the bonnet. Diesel gets filled on each forecourt call-out, again and again. Rarely filled, AdBlue normally goes in out of a bottle, tipped by someone who has to stop and think what filler it needs. The error lives in that gap. ## How AdBlue in your diesel tank takes place around Bishopdown Three things tend to come together, and carelessness is seldom one of them. First, the warning. Low AdBlue brings a warning from the car, and letting it run out means limp mode — hence a hurried top-up, perhaps before work off Fotherby Crescent, or at Hampton Inn on the way home after work. New-to-you motors come next, too. Rentals, new cars and company motors put their fillers in new places, and habit reaches for the cap used on the old one. A spout-topped bottle meets no resistance at a diesel filler any more than at an AdBlue one. So the pour, after started, keeps on. Hampton Park or the heart of Bishopdown: it is the same few seconds either way. ## Which filler is for AdBlue, and which for diesel? Whether a Bishopdown forecourt or a drive over in Salisbury, take a couple of seconds on these before anything goes in. - Position can mislead; the cap doesn't. AdBlue ones tend to be blue or bear the name "AdBlue" — diesel caps normally don't. - On many vehicles, the size tells: AdBlue has the smaller filler neck. - A label inside your fuel flap frequently shows which fuel goes where, on plenty of vehicles. Check for it. - The handbook. If the filler is not by the 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 Salisbury. ## AdBlue top-ups that never reach the diesel tank For the day the light comes on — wherever it is in Wiltshire — a simple routine to follow. - Stop on level, motor off, with time to spare — never hurried on the side of Gilbert Way. - Say "AdBlue" out loud as you unscrew the cap, after you find the AdBlue filler and reading it. Silly, yes, yet it does the trick. - Leave the diesel cap on. If both sit under one flap, check the diesel cap is still closed before you lift the bottle. - Using the bottle's own spout, pour slowly — and stop when it is full or the bottle is empty. - Close the cap, and check again — confirm your diesel filler remained shut the whole time. After that, start the vehicle. If at step two or three you find you have already poured into the diesel side, stop there. Leave out stage five entirely. ## AdBlue in your diesel tank already, around Bishopdown? What follows is a short order of things, starting with no starting your engine. Don't switch the ignition on; on plenty of diesels that alone runs the fuel pump. Topping up with diesel will not thin it: rather than mixing, AdBlue sinks to the bottom of that tank, right where the fuel is taken from. The staff at BP, Shell or another forecourt will usually help to push your car clear if asked. If you're on your own driveway in Bishopdown, leave it where it stands. Stop as soon as it is safe and switch off, if the motor has already run. On the M27, under 15 miles from Bishopdown, that means the next exit. Mileage matters — a short hop across Bishopdown is a smaller job than driving under 3 miles to Salisbury — so say about how far it went. ## What happens when our engineers get there around Bishopdown Outside Wyndham Park Infants' School, near Bishopdown Evangelical Church or on your own driveway: wherever your car has stopped, our technicians come to it. Which liquid was put in, the quantity, and if it ran: our technicians ask since those answers decide both work and price. That price comes on the call, before any van leaves. Then your tank is drained and your system purged thoroughly. Unlike petrol, AdBlue leaves crystals and eats at certain fuel-system metals, and neither washes away by itself. That is why it counts more. The filter is flushed, or replaced where it needs to be; fresh diesel goes in; and the car is tested. Before leaving, we fire it up and check that it's running properly. If the engine has not run, most jobs take about half an hour once we're there, using pumps that are safe on a working forecourt and quiet enough to use outside a house after dark. Your insurer usually wants the engineer's report and the VAT invoice, and you get both once this job is done. Payment comes on the day, with no deposit. It is worth checking your insurance while we travel to you: misfuelling cover comes with many policies. ## About Bishopdown and where it is Bishopdown is a suburban area situated on the outskirts of Salisbury in Wiltshire, lying close to the River Avon at an elevation of around 70 metres. Bishopdown is characterised by its semi-detached housing stock and forms part of the larger urban area surrounding Salisbury. Bishopdown is also near several other residential areas, including Hampton Park, Laverstock, and Wyndham Park, and is approximately 77 miles west of London. ## AdBlue drains across Wiltshire, Bishopdown included Throughout SP postcodes, our vans covering Bishopdown — a residential suburb — work the surrounding places too, Wyndham Park and Laverstock included. Quote a postcode beginning SP1 3, and our van arrives fastest. Your car stays put. We drain it where it is — a side street near Fastness, a lay-by on the way to Bishopdown Sports Field, a driveway. Ring and ask instead of guessing if you are near a border, or somewhere hard to explain, like the back of St Andrew. ## In short, for Bishopdown drivers First, the cap; then, the tip. If AdBlue has gone in your diesel tank all the same, leave the vehicle off then ring 0333 366 0103. Petrol in Diesel empties it where it waits, anywhere across Wiltshire.