--- title: AdBlue in a Diesel Tank Watchfield? Read This canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/watchfield-somerset/ location: Watchfield county: Somerset latitude: 51.218990 longitude: -2.935540 service: AdBlue in a Diesel Tank updated: 2026-10-10 --- # Why It Occurs and How to Prevent It: AdBlue in a Diesel Tank in Watchfield AdBlue already in your diesel tank? Then put this page aside a moment, leave your ignition and engine off, and call 0333 366 0103. Caught before the motor runs, it is generally a drain and a thorough flush, done where your car is in Watchfield. Reading in advance? In that case what follows covers why it comes about and how to stop it happening at all. ## Two fillers, two tanks: AdBlue in a diesel motor Plenty of current diesels on the roads about Watchfield and Mark Causeway carry two liquids, not one. Diesel goes to the engine. AdBlue's own tank keeps it, and from there it is sent to your exhaust, where spraying treats the fumes. Each tank has its own filler. Other cars put the AdBlue filler in the boot or under the bonnet; plenty of others have both side by side behind one flap. The diesel side is fuelled at the petrol pump all the time. The AdBlue side is filled far less commonly, normally from a bottle, and usually by someone who has to stop and think where it goes. That gap is where the slip lives. ## AdBlue in the diesel tank around Watchfield: how it takes place Carelessness rarely explains it. What does is three things lining up together. First, the warning. Low AdBlue brings a warning from the car, and running out leads to limp mode — hence a hurried top-up, perhaps before work off Mark Road, perhaps outside the pub in the village on the way home that evening. Then your car is strange. A hire car, a new car or a company car puts the fillers where your last one didn't, and the hand reaches for the cap it would have used on the old one. And the bottle fits. A bottle with a spout goes into a diesel filler as easily as an AdBlue one, and so nothing stops the pour after it has started. The same few seconds settle it, in the middle of Watchfield or out in Bason Bridge. ## The AdBlue filler and the diesel filler: telling them apart Whether a Watchfield forecourt or a drive out in East Huntspill, take a couple of seconds over these before any is poured in. - The cap. The AdBlue cap is commonly blue, or marked "AdBlue". The diesel cap normally isn't. Read it instead of going by where it sits. - Look at the size: the smaller filler neck is, on many vehicles, the AdBlue one. - A label inside your fuel flap often says which fuel goes where, on many cars. Check for it. - Cannot find it beside the diesel inlet? In that case look beneath the bonnet or in your boot — the handbook will say where. - The previous driver knows. Check as you pick up a rental or fleet car — from Highbridge & Burnham's car park, say — rather than when the light appears. ## Keeping AdBlue out of the diesel tank when you top up Wherever across Somerset the light comes on, here is a routine for the day. - Park and switch off. Not on a slope, not with the motor running, and not in a rush on the side of Pillmore Lane. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds silly and it works. - Both behind one flap? So make sure the cap on the diesel side is still shut ahead of raising the bottle. - Slowly is best, through the bottle's own spout, until it is full or the bottle is empty. - Only after that, start the vehicle: close the cap, check once more, and make sure the diesel cap was never opened. Stop there if you find, at step two or three, that you've already poured into the diesel side. Skip step five entirely. ## Watchfield: already put AdBlue in the diesel tank? Do not start your motor: that's how the short order of things begins. On plenty of diesels the ignition alone runs the fuel pump, so don't switch it on. Do not top up with diesel to dilute it: AdBlue doesn't mix with diesel, it sinks to the bottom of your tank, where your fuel is pulled from. If you are on a forecourt, whether it is the Asda or the another forecourt nearby, ask the staff to help push the car away from the petrol pump. Leave it where it is if you are on your own drive around Watchfield. Stop as soon as it is safe then switch off, if the motor has already run. Leave the M5 — under a mile out of Watchfield — at the first exit. Distance counts — a short hop across Watchfield makes a smaller job than heading under 15 miles to Wells — so tell us roughly how far it went. ## Our arrival around Watchfield, and what takes place next Our technicians come to the vehicle wherever it has stopped, whether that's outside Mark First and Pre-School CE Academy, near Watchfield Hall or on your own driveway. Those replies determine the work and our price, so we ask what was put in, about how much, and if it's run. That price comes on the call, before any van leaves. The fuel system is then cleaned thoroughly, once that tank is emptied. More than with petrol, it matters here: crystals form, certain metals are attacked, and nothing washes away on its own, however long it sits. A test comes at the end: before that, clean diesel is added, and your filter is flushed or replaced if necessary. We don't leave until it has been started and is running correctly. Unrun vehicles usually need a half-hour job from arrival. The kit is fine on a busy filling station, and quiet enough for a residential street after dark. Paying is on the day, not upfront, and you are given the documents your insurer asks for: an engineer's report and a VAT invoice. It is worth looking at your policy as the van travels to you: misfuelling cover comes with many policies. ## About Watchfield Watchfield is a small village in Somerset, situated near the coast and close to the nearby settlements of Bason Bridge and Walrow. Watchfield sits at a low elevation of around 8 metres, looking out towards the Bristol Channel. Watchfield is characterized by its predominantly detached housing stock, reflecting its role as a residential community within the wider region. Watchfield remains a quiet village, located near the city of Wells and within commuting distance of larger urban areas. ## AdBlue drains around Watchfield and across Somerset Being a coastal village, Watchfield shares its vans surrounding places — Walrow, Northwick — right across TA postcodes and the surrounding area beyond. Quickest of all: give a TA9 4 postcode for the van. Moving the vehicle is not needed. Our engineers drain it where it is — a side street close to Rich's Cider Farm, a lay-by on the way to Mark Playing Fields, a drive. If you are close to a border, or somewhere hard to describe like the back of Oak Tree Arena, ring and ask rather than guessing. ## The short version for Watchfield motorists First, the cap; then, the tip. AdBlue in your diesel tank after all? Keep the vehicle off and phone 0333 366 0103; Petrol in Diesel drains it where it stands, across Somerset.