--- title: Explained: AdBlue in a Diesel Tank Trull canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/trull-somerset/ location: Trull county: Somerset latitude: 50.993710 longitude: -3.118780 service: AdBlue in a Diesel Tank updated: 2026-10-25 --- # How It Happens and How to Avoid It: AdBlue in a Diesel Tank in Trull If AdBlue is already in your diesel tank, stop reading for a moment: leave your engine and your ignition off and ring 0333 366 0103. Around Trull, catching it before your motor turns usually means a drain and a full flush where it stands. Here before the event? Then the rest explains how it happens and how to stop it ever happening. ## Why does AdBlue in a diesel car need its own filler? Not one fluid but two: that's how many modern diesels around Trull and Sherford run, with diesel for your engine. AdBlue goes to your exhaust, where it is sprayed into the gas to fresh it, and it lives in a tank of its own. Separate tanks, different fillers. Some vehicles put the AdBlue filler in the boot or under the bonnet; a lot of others have both together behind one flap. Topping up your diesel side at the petrol pump happens constantly. The AdBlue side is filled far less regularly, normally from a bottle, and normally by a person who has to stop and think where it goes. That gap is where the mistake lives. ## Trull: how AdBlue in the diesel tank takes place Seldom is it carelessness: usually three things line up. To start with, the warning. Low AdBlue brings a message from the vehicle, and running out means limp mode — hence a hurried top-up, maybe before work off Wild Oak Lane, or outside The Winchester Arms on the way home after work. The old car's cap is where the hand reaches — but a hire car, a new car or a company car puts the fillers somewhere else. That's a second factor: a new car. And the bottle fits. A bottle with a spout goes into a diesel filler as easily as an AdBlue one, so nothing stops the tip after it has started. Whether it occurs in Eastbrook or the middle of Trull, it is the same few seconds. ## The AdBlue filler and the diesel filler: telling them apart Before you pour anything, whether on a driveway in Kibbear or a forecourt around Trull, check these. They take a few seconds. - The cap. The AdBlue cap is commonly blue, or marked "AdBlue". Your diesel cap normally isn't. Read it rather than going by position. - The size. On many vehicles the AdBlue filler neck is the smaller of the two. - Check inside the fuel flap: many vehicles carry a label there saying which fuel goes where. - In your boot or under the bonnet: that's where the filler sits if it is not by the diesel cap, and the handbook says which. - Collecting a hire or company car, perhaps at the car park outside Taunton? Check with the person who drove the car last before leaving, not once the light goes on. ## Topping up AdBlue without it reaching your diesel tank The day the light goes on, anywhere around Somerset, follow this routine. - Not in a rush on the side of Mill Lane, not on a slope, not with your engine running: park then switch off first. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds silly and it does the trick. - Both under a single flap? So make sure the cap on your diesel filler stays closed ahead of raising the bottle. - Pour slowly, using the bottle's own spout. Stop when it is full or when the bottle is empty. - Close the cap and check once more. Make sure the diesel cap was never opened. Only then start your car. If at stage two or three you find you have already poured into the diesel side, stop there. Don't carry on to stage five. ## AdBlue in the diesel tank already, in Trull? Brief list, then. First: the motor stays off. On many diesels the ignition alone runs the fuel pump, so don't switch the car on. AdBlue does not mix with diesel — it sinks to the bottom of your tank, where your fuel is drawn from — so don't top up with diesel to dilute it. The attendants at Texaco, Esso or any forecourt will normally lend a hand to push the car clear if asked. Your own driveway in Trull is the place it should stay. Stop as soon as it is safe and switch off, if the engine has already run. On the M5, under a mile from Trull, that means the next exit. A short hop across Trull is a smaller job than a run towards Wells, under 50 miles away, so tell us roughly how far it went. ## When we arrive around Trull, what occurs? Our technicians come to the vehicle wherever it has stopped, whether that's outside Trull Church of England VA Primary School, close to Trull Church Community Centre or on your own driveway. Our technicians ask what got in, roughly how much, and whether it has run, because the answers settle this work and the quote. That price is given on the call, ahead of any van leaving. Emptying that tank comes next, followed by a full flush of the fuel system. With AdBlue that matters more than with petrol: it crystallises and is corrosive to some of the metals in a fuel system, so it does not wash out on its own. The filter is flushed, or replaced where it needs to be; clean diesel goes in; and the vehicle is tested. Your engine is fired up next and tested to be sure it runs smoothly, all before we go. If the motor has not run, the majority of jobs take about half an hour once we are there, using pumps that are fine on a busy forecourt and quiet enough to use outside a house after dark. Paying happens on the day, not upfront, and you are given the documents an insurer asks for: an engineer report and a VAT invoice. Many insurance policies include misfuelling cover, so it is worth checking yours whilst we are on the way. ## About Trull Trull is a small village in Somerset, situated near the River Tone and surrounded by the rolling hills of the South West. Trull has a population of around 641 people and is characterised by its predominantly detached housing. Trull sits at an elevation of 46 metres, close to nearby places such as Eastbrook, Staplehay, and Canonsgrove. Trull is located approximately 25 miles from the city of Wells and 134 miles from London. ## AdBlue drains in Trull and across Somerset Staplehay and Canonsgrove are among the places around Trull, a village, that the same vans cover, over TA postcodes. Give a postcode that starts TA3 7, and the van gets there fastest. There's no need to move the vehicle. A drive, a lay-by on the way to King George's Field, a side street near All Saints: our technicians drain it where it sits. If you're near a boundary, or somewhere hard to describe like the back of Trull Memorial Hall, ring and ask rather than guessing. ## The short version for Trull drivers Pour no AdBlue till you've read the cap. If AdBlue has gone in the diesel tank all the same, leave the vehicle off and ring 0333 366 0103. Petrol in Diesel drains it where it stands, anywhere in Somerset.