--- title: Explained: AdBlue in a Diesel Tank Wiswell canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/wiswell-lancashire/ location: Wiswell county: Lancashire latitude: 53.834320 longitude: -2.384670 service: AdBlue in a Diesel Tank updated: 2026-10-12 --- # Why It Occurs and How to Avoid It: AdBlue in a Diesel Tank in Wiswell AdBlue already in your diesel tank? In that case put this page down a moment, leave your ignition and motor off, and call 0333 366 0103. Caught before your motor runs, it is normally a drain and a thorough flush, done where the car is around Wiswell. If you are reading before it has happened, the remainder of this page is about why it takes place and how to make sure it does not. ## Why does AdBlue in a diesel car need its own filler? Many newer diesels on the roads about Wiswell and Nethertown carry two liquids, not one. Diesel goes to the motor. AdBlue's own tank keeps it, and from there it is sent to the exhaust, where spraying treats the gas. Each tank has its own filler. On a lot of cars the two sit side by side under the same flap; on others the AdBlue filler is in the boot or under the bonnet. Filling your diesel side at the petrol pump goes on all the time. The AdBlue side is filled far less frequently, usually from a bottle, and normally by a person who has to stop and think where it goes. Mistakes happen in the gap between them. ## Wiswell: how AdBlue in your diesel tank happens Seldom is it carelessness: normally three things coincide. On a drive off Pendleton Road before work, or in the car park at Freemasons on the way home: that is where the rushed top-up happens. Why the rush? As AdBlue runs low the vehicle tells you, and once it is empty, limp mode kicks in. Next, the hand reaches for the cap it would have used on the old car — since a hire car, a new motor or a company car places the fillers where your last one didn't. A spouted bottle meets no obstacle at a diesel filler any more than at an AdBlue one. And so the tip, once started, carries on. It's seconds, be it in Barrow or bang in the heart of Wiswell. ## The AdBlue filler and the diesel filler: telling them apart A couple of seconds is all these take — so run through them before you pour anything, on a driveway in Billington or a forecourt around Wiswell. - Position can mislead; the cap does not. AdBlue caps are often blue or carry the name "AdBlue" — diesel caps usually do not. - Check the size: the smaller filler neck is, on plenty of vehicles, the AdBlue one. - A label inside your fuel flap frequently shows which fuel goes where, on many vehicles. Look for it. - The handbook says where it lives if the filler isn't next to the diesel cap: the boot, or under the bonnet. - The person who drove it last. On a hire or company car picked up from somewhere like the car park outside Whalley, ask before you leave, not when the light comes on. ## AdBlue top-ups that never reach the diesel tank A routine for the day the light comes on, wherever in Lancashire that is. - Stop somewhere level, engine off, with time in hand — never hurried on the side of Cunliffe Lane. - Locate the AdBlue filler, check the cap, and speak the word "AdBlue" out loud while unscrewing it. It seems daft. It works. - If both sit under one flap, check your diesel cap is still closed before you lift the bottle — and leave the car on. - Using the bottle's own spout, tip slowly — and stop when it is full or the bottle is empty. - Close the cap and check once more. Make sure the diesel cap was never opened. Only then start the vehicle. Discover at the second or third stage that AdBlue went in the diesel tank? That is where you stop. Never carry on to step five. ## AdBlue in the diesel tank already, in Wiswell? Do not start your engine: that is how the short order of things begins. On many diesels your ignition alone runs the fuel pump, so do not switch the car on. AdBlue does not mix with diesel — it sinks to the bottom of the tank, where the fuel is sucked from — so don't top up with diesel to dilute it. If you are at a forecourt, whether it is the Asda or the Shell, ask the staff to help roll the vehicle away from the pump. At home around Wiswell? Then the car remains where it is. Stop as soon as it is safe and switch off, if the engine has already run. The next exit is the place to leave if you're on the M65, under 5 miles from Wiswell. Roughly how far did it go? Hopping across Wiswell is less work than a run of under 15 miles towards Preston, and so tell us. ## When our technicians arrive around Wiswell, what occurs? Our technicians come to your car wherever it has stopped, whether that is outside Barrow URC Primary School, close to Jeppe Knave Grave or on your own drive. Those replies settle this work and our price, so our technicians ask what got in, roughly how much, and if it has run. You hear that price by phone, before anybody heads out. Your system is then cleaned thoroughly, once that tank is emptied. AdBlue crystallises and is corrosive to some of the metals in a fuel system, and so it doesn't wash out on its own — which is why the flush counts more with AdBlue than with petrol. A test comes at the end: before that, fresh diesel is added, and the filter is cleaned or changed as needed. Before we leave, our technicians start the engine and confirm that it's running smoothly. With pumps safe on a busy forecourt and quiet enough for use outside a house at night, most jobs in which the motor hasn't run take about half an hour once our engineers arrive. The insurer usually wants an engineer's report and your VAT invoice, and you get both at the end. Payment is on the day, with no money upfront. It's worth checking your policy while we travel to you: misfuelling cover comes with many policies. ## About Wiswell, for a moment Wiswell is a small village in Lancashire, situated inland at an elevation of 134 metres, with detached housing being the predominant type of accommodation. Wiswell lies approximately 13.8 miles from Preston and 186.5 miles from London, placing it in a relatively rural setting. Wiswell is surrounded by nearby places such as Barrow, Whalley, and Pendleton, and has a population of around 517 residents. Wiswell retains a quiet, residential character, typical of many villages in the North West region. ## AdBlue drains in Wiswell and across Lancashire Being a rural village, Wiswell has the same vans as surrounding places — Whalley, Pendleton — right across BB postcodes and the wider area around them. The van gets to you fastest with a postcode starting BB7 9. Your car doesn't need to move. A drive, a lay-by on the way to Spring Wood, a side street near Forge Corner: our engineers drain it where it is. Assuming doesn't help behind Whalley Methodist Church, close to a boundary, or anywhere hard to describe; phone and check. ## For Wiswell people, the short version Tip nothing till you've read the cap. If AdBlue has gone in the diesel tank regardless, leave the vehicle off then call 0333 366 0103. Petrol in Diesel drains it where it sits, anywhere across Lancashire.