--- title: Explained: AdBlue in a Diesel Tank Peacemarsh canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/peacemarsh-dorset/ location: Peacemarsh county: Dorset latitude: 51.046950 longitude: -2.280270 service: AdBlue in a Diesel Tank updated: 2026-10-20 --- # AdBlue in a Diesel Tank in Peacemarsh: How It Occurs and How to Prevent It If AdBlue is already in your diesel tank, stop reading for a moment: leave the engine and the ignition off and phone 0333 366 0103. A drain plus a full flush, done right where the vehicle sits around Peacemarsh, is usually what it needs when found before your engine runs. The remainder of this page covers why it takes place and how to make sure it does not — useful if you're reading before it has happened. ## Why does AdBlue in a diesel motor need its own filler? Many newer diesels in Milton on Stour, like those in Peacemarsh, carry on two liquids; the engine gets just the diesel. Your exhaust, not your engine, is where AdBlue ends up: sprayed into the fumes to clean them, from a separate tank. Each tank has its own filler. Some vehicles keep the AdBlue filler in your boot or under the bonnet; a lot of others place the two together under one flap. Diesel gets filled on each filling station call-out, week in, week out. Someone who has to stop and work out where it goes normally tops up the AdBlue side, from a bottle, and far less commonly. Mistakes happen in that gap between them. ## How AdBlue in the diesel tank happens around Peacemarsh Seldom is it carelessness: normally three things coincide. On a driveway off Dolphin Lane before work, or in the car park outside The Dolphin heading home: that is where the rushed top-up takes place. What is the reason for the rush? As AdBlue gets low the vehicle tells you, and if it is gone, limp mode kicks in. Unfamiliar vehicles come next, as well. Rentals, new cars and company vehicles place their fillers differently, and habit reaches for the cap used on the old one. A spout-topped bottle meets no resistance at a diesel filler no more than at an AdBlue one. So the tip, after started, carries on. Whether it happens in Colesbrook or the middle of Peacemarsh, it is the same few seconds. ## Which filler is for AdBlue, and which for diesel? Whether a Peacemarsh forecourt or a driveway over in Bowridge Hill, take a few seconds over these before anything is poured in. - Where it sits can mislead; the cap does not. AdBlue ones are often blue or bear the word "AdBlue" — diesel ones usually do not. - Plenty of cars fit AdBlue the smaller neck of the two. - A label inside the fuel flap frequently says which fuel goes where, on plenty of cars. Check for it. - The handbook shows where it lives if your filler is not next to the diesel cap: your boot, or under the bonnet. - Ask the person who drove it last — before you leave, not when the light comes on — if you collect a hire or company car from somewhere like the car park at Gillingham (Dorset). ## Topping up AdBlue without it reaching the diesel tank A routine for the day the light comes on, wherever in Dorset that is. - Park and switch off. Not on a slope, not with your engine running, and not in a rush on the side of Peacemarsh Farm Close. - Say "AdBlue" out loud as you unscrew the cap, after finding the AdBlue filler and read it. Silly, yes, yet it does the trick. - The two under one flap? Then make sure the lid on the diesel filler stays closed before lifting the bottle. - Tip slowly, using the bottle's own spout. Stop when it's full or when the bottle is empty. - Close the cap, then check once more — confirm the diesel filler stayed closed the whole time. After that, start the vehicle. Stop there if you find, at stage two or three, that you've already poured into the diesel side. Stage five stays out. ## Peacemarsh: already put AdBlue in your diesel tank? Then the order of things is short. Don't start the engine. Leave the ignition off too, because on plenty of diesels it by itself runs your fuel pump. Filling up with diesel will not dilute it: instead, AdBlue sinks to the bottom of that tank, right where fuel is taken from. The staff at Esso, Shell or another forecourt will usually help to push your car away when asked. Your own drive around Peacemarsh is where it stays. When the motor has run already, stop somewhere safe then switch the car off. The next exit is the place to come off when you're on the M5, under 50 miles from Peacemarsh. About how far did it go? Crossing Peacemarsh is less a job than a run of under 25 miles towards Wells, so tell us. ## Our arrival in Peacemarsh, and what happens next By Gillingham Primary School, near St Benedict or on your own drive: wherever the vehicle has stopped, we come to it. Which liquid got in, the quantity, and if it ran: our engineers ask because those answers decide the work and price. Nobody sets off until you've had our price by phone. The fuel system is then rinsed thoroughly, once that tank is emptied. Unlike petrol, AdBlue leaves crystals and attacks some fuel-system metals, and none of that clears away by itself. That is why it matters more. Filter cleaned or, where it must be, replaced; clean diesel in; then a test of your vehicle. Your engine is fired up next and checked to confirm it runs smoothly, all before we head off. Using pumps fine on a working forecourt and quiet enough for use outside a house at night, most jobs in which the motor has not run need roughly half an hour after our engineers are there. The insurer will ask for the engineer's report and your VAT invoice, and both are yours at the end. Payment comes on the day, with no money upfront. Many insurance policies include misfuelling cover, so it is worth checking yours while we are on the way. ## About Peacemarsh, briefly Peacemarsh is a suburban area situated on the riverside in Dorset, with a mix of semi-detached housing and a population of around 2889 residents. Peacemarsh sits at an elevation of 82 metres, near the villages of Colesbrook, Lodbourne, and Cold Harbour. Peacemarsh is located approximately 19 miles from the city of Wells and about 98 miles from London, making it a relatively rural suburb in the South West region. Peacemarsh has a quiet, residential character, typical of many suburban areas in the county. ## AdBlue drains about Peacemarsh, and Dorset beyond As a residential suburb, Peacemarsh shares its vans surrounding areas — Lodbourne, Cold Harbour — right through SP postcodes and the wider area around them. The van gets to you fastest with a postcode starting SP8 4. The car doesn't need to shift. A driveway, a lay-by on the way to Gyllas Green, a side street close to St Mary the Virgin: our technicians drain the car where it stands. Tricky to pin down, like the back of Gillingham Youth & Community Centre? Close to a county line? Checking beats guessing, and so phone. ## In short, for Peacemarsh drivers Read the cap before you tip. Even so AdBlue in the diesel tank? Petrol in Diesel can drain it wherever it is, anywhere across Dorset: keep the vehicle off and call 0333 366 0103.