--- title: Explained: AdBlue in a Diesel Tank Bayswater canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/bayswater-greater-london/ location: Bayswater county: Greater London latitude: 51.512290 longitude: -0.183300 service: AdBlue in a Diesel Tank updated: 2026-10-05 --- # Avoiding AdBlue in a Diesel Tank in Bayswater: Why It Occurs AdBlue already in your diesel tank? Then put this page aside for now, keep your ignition and engine off, then ring 0333 366 0103. Caught before your engine runs, it's normally a drain and a thorough flush, done where your car is around Bayswater. Here in advance? In that case what follows covers why it comes about and what to stop it ever happening. ## AdBlue in a diesel motor: two tanks, two fillers Many modern diesels on the roads round Bayswater and Knightsbridge carry two liquids, not one. Diesel goes to your engine. Its own tank holds it, and from there it is sent to the exhaust, and there a spray treats the gas. Each tank has its own filler. Other motors put the AdBlue filler in the boot or under the bonnet; plenty of others place both together under one flap. At the pump, your diesel side gets filled all the time. Someone who has to stop and work out where it goes usually fills the AdBlue side, from a bottle, and much less commonly. The mistake grows in the gap between them. ## How AdBlue in the diesel tank happens around Bayswater Seldom is it carelessness: usually three things coincide. On a drive off Craven Hill Gardens before work, or in the car park at The Leinster Arms on the way home: that's where the hurried top-up takes place. What is the reason for the rush? As AdBlue gets low the car warns you, and once it is gone, limp mode follows. New-to-you cars are second, as well. Hire cars, new motors and company vehicles put their fillers differently, and the hand reaches for the cap used on the old one. Lastly, the spout goes in: diesel filler or AdBlue one, it goes in as easily, and after the pour starts, nothing stops it. The same few seconds decide it, in the middle of Bayswater or out in Paddington. ## The AdBlue filler and the diesel filler: telling them apart A couple of seconds is all these take — so check them before you tip anything, on a drive in Kensington or a forecourt around Bayswater. - Blue and lettering: an AdBlue cap is commonly blue, or says "AdBlue", where a diesel cap normally doesn't. Go by the cap, not its position. - Look at the size: the smaller filler neck is, on plenty of vehicles, the AdBlue one. - The flap. Look inside your fuel flap for a label. Plenty of cars say there which fuel goes where. - Cannot see it beside the diesel filler? Then check beneath the bonnet or in your boot — the owner's manual says which. - The person who drove it last. On a hire or company car picked up from somewhere like the car park outside London Paddington, ask before you leave, not when the light comes on. ## Keeping AdBlue out of the diesel tank when you top up When the light goes on, wherever around Greater London, use this routine. - Pull in somewhere level, engine off, with time to spare — not rushing on the side of Leinster Terrace. - Silly as it sounds, saying "AdBlue" aloud as you unscrew the cap works — once you have located your filler and read the cap. - If both sit under one flap, check your diesel cap is still closed before you lift the bottle — and leave the car on. - Stop when your tank fills or the bottle is empty; before that, tip gently through its built-in spout. - Only after that, start the car: close the cap, check a second time, and make sure your diesel cap was never opened. If at step two or three you find you have already poured into the diesel side, stop there. Never go on to stage five. ## Already put AdBlue in the diesel tank around Bayswater? Short order, then. Top of that: the motor remains unstarted. Leave your ignition off too, because on plenty of diesels switching it on by itself runs your fuel pump. 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 sucked from. Ask the staff to help push your car away from the petrol pump if you're at a forecourt — the Shell, the Esso or anywhere else. Leave it where it is if you're on your own driveway in Bayswater. Already run? Stop once it is sensible, then switch off. Bayswater lies under 5 miles from the M4; there, take the next exit. A short hop across Bayswater is a smaller job than a run towards Westminster, under 3 miles away, so tell us roughly how far it went. ## When our engineers arrive around Bayswater, what happens? Wherever the car has stopped, be it by St James & St John Church of England Primary School, beside Fake houses or on your own drive, the van comes to it. Both the work and the quote rest on three answers — what fluid, what amount, and if it has run — so we ask. That price is given on the call, before any van leaves. Emptying that tank comes next, then a thorough flush of your system. Not like petrol, AdBlue leaves crystals and attacks some fuel-system metals, and neither clears away by itself. Hence it matters more. Testing comes at the end: before that, fresh diesel goes in, and the filter is cleaned or changed if necessary. Next we start the car and confirm it runs smoothly before leaving. Unstarted cars usually need a half-hour job from the moment we arrive. The kit is fine on a live forecourt, and hushed enough for a residential street late at night. Your insurer will ask for an engineer's report and your VAT invoice, and you get both once the job is done. Payment is on the day, with no money upfront. It's worth checking your policy as the van travels to you: misfuelling cover comes with plenty of policies. ## About Bayswater Bayswater is a suburban area in inner London, situated near the northern end of Hyde Park and overlooking the Serpentine lake. Bayswater sits at a relatively low elevation of around 30 metres, close to the city centre and neighbouring areas like Paddington and Little Venice. Bayswater is predominantly composed of flat dwellings, accommodating a population of approximately 18,000 residents. Bayswater is also near Westbourne Green and Westminster, making it a convenient location for those working in central London. ## AdBlue drains in Bayswater and across Greater London Little Venice and Westbourne Green are among the places near Bayswater, a residential suburb, that the same vans cover, over W postcodes. The van reaches you fastest with a postcode starting W2 3. Moving the vehicle isn't necessary. A drive, a lay-by on the way to Corringham Garden, a side street near Jane and John Loudon: our engineers drain it where it is. Ring and ask instead of assuming if you're close to a border, or somewhere hard to explain, like the back of Francis Bret Harte. ## In short, for Bayswater people Before you pour, read the cap. Petrol in Diesel empties it on the spot, anywhere across Greater London, if AdBlue has gone in the diesel tank anyway — so leave it off then phone 0333 366 0103.