--- title: AdBlue in a Diesel Tank Derrynaflaw: What Now canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/derrynaflaw-county-londonderry/ location: Derrynaflaw county: County Londonderry latitude: 54.927000 longitude: -6.965000 service: AdBlue in a Diesel Tank updated: 2026-10-03 --- # AdBlue in the Diesel Tank in Derrynaflaw, and What to Do Next Everything turns on a single fact: if the motor has started after the AdBlue went in — more than anything else. If it has not, keep it that way, whether your car is in Derrynaflaw itself or out in Feeny. Normally that is emptying and properly purging it right there in Derrynaflaw — so keep your key and motor off and call 0333 366 0103. When your motor has run, stop safely straight away, then turn the car off. The job is bigger, yet the first step is the same. Find the scenario below that matches yours, wherever in County Londonderry it happened. ## At the pump in Derrynaflaw: AdBlue in a diesel You are at the pump, the nozzle or the bottle still in your hand, and you have just noticed the cap you opened was the wrong one. Be it the nearest petrol station, another forecourt nearby or anywhere else around Derrynaflaw, the case is the same. What it means: this is the ideal place to find out. No pump has pulled it through, so the AdBlue stays just in that tank. Clearing the petrol pump is no reason to start it — so do not get back in. Get the staff to lend a hand pushing it into a space, save the bottle, then ring us from there. If it cannot be shifted, it can be drained at the pump: the equipment is explosion-proof and safe on a working forecourt. ## Derrynaflaw, at home: AdBlue in your diesel tank Several days had passed with the dash light on. You bought a bottle, poured it in on the drive, and only when you put the empty bottle in the recycling did you look again at the cap. It takes place on driveways just off Rock Street as commonly as anywhere. What it means: if you have not driven since, this is almost as good as the forecourt. AdBlue doesn't mix with diesel; it sinks to the bottom of the tank and waits there. Overnight does not change that. What to do: leave your keys inside the house so nobody moves the vehicle in the morning. Then ring. Your drive is where it is drained, be it around Derrynaflaw or Dungiven. Even at night, our pumps are quiet enough for a driveway. ## AdBlue in a diesel and already driving around Derrynaflaw? A short way after topping up, your engine began misbehaving: rough running, smoke, lost power, warnings on the dash. Maybe it was on An Cnoc, perhaps on the way out towards Derry, under 15 miles away. The upshot: the system has drawn AdBlue through already. It's been through your filter and the fuel lines and, the further you went, into the high-pressure fuel pump and your injectors. It travels further with every extra mile driven and every restart. What to do: pull over where it's safe to do so then switch off. On the M77, over 50 miles from Derrynaflaw, that means the next exit, not the services further on. No trial starts: clearing isn't something AdBlue will do. Roughly what distance did it go? Tell us as you phone. ## AdBlue in the wrong tank of a hire, lease or company car A week back, the car was new to you. Unbeknown to you, the two inlets sit side by side here — unlike your own car, which has no AdBlue or keeps it elsewhere. Anywhere you happen to be in County Londonderry, every motorist can slip up. Meaning? Whichever case above applies here — run or not — and one extra step. Plenty of hire and company agreements require the owner's sign-off before repairs. Next: ring the rental company or your fleet manager first, then us — sorting it before we arrive is quicker. Keep the vehicle off while the reply comes, whether you're parked at the nearest station or near the centre. ## AdBlue in your diesel tank? Not sure, in Derrynaflaw Sometimes the honest answer is "I think so". A faint ammonia-like whiff lingers near the filler, the bottle seems too light, and which cap came off is a blur. The gates of the local primary school in a rush, say, or a friend's driveway out in Banagher. Meaning? Drips around the filler never touch your motor at all. In your diesel tank, however, AdBlue damages it. If there is AdBlue in that tank, firing up your car will pull it in, and it wouldn't tell you which either. Your move: act as if it got in, and never start your motor. Checking a tank that proves clean is better than draining one once it's been run — so ring then describe to us what you saw. ## What every AdBlue drain around Derrynaflaw has in common Every case has the same opening to the job. Anywhere the vehicle stands — the pub in the village's car park, a road by a street just off the centre, a driveway, a forecourt — our van gets there and asks for the fluid, the quantity, plus whether your engine has been run. Those answers determine the work, and you hear our price by phone, before anyone heads out. AdBlue forms crystals and is corrosive to certain metals used in fuel systems, and so it won't wash out on its own; that is why the flush, after this drain, counts far more here than with petrol. Your filter is cleaned, or replaced where it needs to be; clean diesel goes in; and the car is tested. If your engine has not run, the majority of jobs take about half an hour once we're there. The final step is starting the car. We make sure it runs properly on new diesel before leaving. Lasting damage is very rare when it is spotted early, and the whole job is done where the vehicle is. Nothing is paid upfront, payment is made on the day, and you get what your insurer wants: an engineer report and a VAT invoice. It is worth remembering: many insurers offer misfuelling cover, so a check of your documents while we travel is worthwhile. ## About Derrynaflaw, for a moment Derrynaflaw is a small locality in County Londonderry, situated inland at an elevation of 86 metres. Derrynaflaw lies approximately 14 miles from Derry, near the settlements of Dungiven and Gortnahey. Derrynaflaw is characterised by its predominantly detached housing stock, reflecting its rural setting. Derrynaflaw has a population of around 688 residents, according to recent estimates. ## AdBlue drains across County Londonderry, Derrynaflaw included As a small village, Derrynaflaw shares its vans with the surrounding places — Burnfoot, Gortnahey — right through BT postcodes. Telling us a BT47 4 postcode finds you quickest of all. Whether the vehicle is on a lay-by on the way to the green space at the edge of the village or in a car park in the middle of Derrynaflaw, it does not need to shift. Wherever it stands, that's where it gets emptied. Ring and ask instead of guessing if you are close to the far end of the built-up part, near a border, or somewhere tricky to explain. ## Your situation, summed up Where it has not run, phone then leave it that way. Whichever line applies, Petrol in Diesel handles from there on 0333 366 0103, across County Londonderry and within Derrynaflaw — after you stop, turn off then ring, if it's run.