--- title: Explained: AdBlue in a Diesel Tank Swanscombe canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/swanscombe-kent/ location: Swanscombe county: Kent latitude: 51.453070 longitude: 0.284400 service: AdBlue in a Diesel Tank updated: 2026-10-26 --- # AdBlue in a Diesel Tank in Swanscombe: Why It Occurs and How to Prevent It Stop reading for a moment when the diesel tank already has AdBlue in it: ignition off, engine off, and call 0333 366 0103. Caught before the engine runs, it's generally a drain and a thorough flush, done where the vehicle is in Swanscombe. If you are reading before it has happened, the remainder of this page is about why it occurs and how to make sure it doesn't. ## AdBlue in a diesel car, and its separate tank Many modern diesels around Bluewater, as well as Swanscombe, carry on two liquids; your engine gets just the diesel. Kept in a tank of its own, AdBlue is sprayed into the exhaust gas to clean it. Every tank has one filler of its own. Some vehicles keep the AdBlue filler in the boot or under the bonnet; plenty of others place both side by side under one flap. Filling your diesel side at the pump happens all the time. Rarely topped up, AdBlue normally comes out of a bottle, tipped by someone who has to stop and think which filler it needs. The slip lives in that gap. ## How does AdBlue in the diesel tank happen around Swanscombe? Three things tend to come together, and carelessness is rarely one of them. First, the warning. Low AdBlue triggers a warning from your car, and running out leads to limp mode — hence a rushed top-up, maybe before work off High Street, or at Pier Hotel on the way home that evening. Then the vehicle is strange. A hire car, a new motor or a company car puts the fillers where your last one didn't, and your hand gets to 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, so nothing stops the pour once it has started. Whether it happens in Greenhithe or the middle of Swanscombe, it is the same few seconds. ## Telling the AdBlue filler from the diesel filler Before you pour anything, whether on a driveway in Horns Cross or a forecourt in Swanscombe, check these. They take a few seconds. - Where it sits misleads; the cap doesn't. AdBlue ones tend to be blue or carry the word "AdBlue" — diesel caps normally don't. - The size. On plenty of vehicles the AdBlue filler neck is the smaller of the two. - A label inside the fuel flap often shows which fuel goes where, on many motors. Look for it. - The handbook. If the filler isn't by your diesel cap, it is in the boot or under the bonnet, and the handbook says which. - The previous driver will know. Ask as you pick up a rental or fleet car — from Greenhithe for Bluewater's car park, say — rather than once the light appears. ## Keeping AdBlue out of the diesel tank when you top up The day the light goes on, wherever in Kent, use this routine. - Stop somewhere level, engine off, with time to spare — never hurried on the side of Pier Road. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds silly and it works. - The diesel cap stays on. When both share a flap, confirm it is shut before the bottle comes up. - Stop once your tank fills or the bottle is empty; until then, pour slowly using its own spout. - Shut the cap, then check once more — confirm your diesel filler remained shut throughout. After that, start your car. Spot at stage two or three that it has already gone into the diesel side? So stop just there. Never go on to step five. ## Already put AdBlue in your diesel tank around Swanscombe? Then the order of things is short. Do not start the engine. Do not switch the ignition on; on plenty of diesels that alone runs the fuel pump. AdBlue does not mix with diesel — it sinks to the bottom of that tank, where the fuel is drawn from — so do not top up with diesel to dilute it. If you are at a forecourt, whether it is the Esso or the Asda, ask the attendants to help push the vehicle away from the pump. Leave it where it is if you are on your own drive around Swanscombe. Stop as soon as it is safe then switch off, if the motor has already run. Swanscombe lies under 3 miles from the M25; there, use the next junction. A short hop across Swanscombe is a smaller job than a run towards London, under 25 miles away, and so tell us roughly how far it went. ## What occurs when we arrive around Swanscombe Wherever your car came to rest, whether outside Knockhall Primary School, near Claire Tiltman Memorial or at home, our van comes to it. What fluid went in, the quantity, and whether it ran: our engineers ask since the replies decide both work and price. During the phone call itself, you are told the quote — ahead of anything else. The system is then purged thoroughly, once the tank is drained. Much more than with petrol, it counts with AdBlue: the crystals build up, certain metals are attacked, and nothing clears away on its own, however long it is left. After your filter has been flushed — or replaced, where required — fresh diesel goes in, and finally your vehicle is tested. Before leaving, our engineers fire it up and check that it is running correctly. Unrun vehicles mostly mean a half-hour visit after arrival. The equipment is safe on a live forecourt, and hushed enough for a residential street after dark. Payment happens on the day, not upfront, and you are given the paperwork an insurer asks for: an engineer report and a VAT invoice. Plenty of insurance policies include misfuelling cover, and so it is worth checking yours whilst we are on the way. ## About Swanscombe, for a moment Swanscombe is a town situated on the southern bank of the River Thames in Kent, with a low elevation of around 10 metres above sea level. Swanscombe is located near the towns of Greenhithe and Stone, and is close to the M25 motorway. Swanscombe has a high proportion of flat housing and is approximately 18 miles from central London. Swanscombe is part of the wider Dartford urban area, with nearby villages including Knockhall. ## AdBlue drains across Kent, Swanscombe included Being a riverside town, Swanscombe has the same vans as nearby areas — Knockhall, Stone — right across DA postcodes and the surrounding area around them. Give a postcode beginning DA9 9, and the van gets there fastest. Your car stays put. A driveway, a lay-by on the way to Ingress Abbey Heritage Park, a side street close to St Mary's Church: our engineers drain it where it stands. Ring and ask rather than guessing if you're near a boundary, or somewhere hard to explain, like the back of Greenhithe Community Centre. ## In short, for Swanscombe motorists Read the cap before you pour. Petrol in Diesel empties it on the spot, anywhere around Kent, if AdBlue has gone in the diesel tank anyway — and so leave the car off and ring 0333 366 0103.