--- title: AdBlue in a Diesel Tank North Feltham: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/north-feltham-greater-london/ location: North Feltham county: Greater London latitude: 51.459430 longitude: -0.412170 service: AdBlue in a Diesel Tank updated: 2026-10-11 --- # North Feltham: How Does AdBlue End Up in a Diesel Tank, and How Do You Prevent It? Keep your motor and ignition off then phone 0333 366 0103 now — the rest can wait when AdBlue is already in the diesel tank. Around North Feltham, finding it before your engine turns usually leaves draining and a thorough flush on the spot. The rest of this page covers why it occurs and how to make sure it doesn't — handy if you're reading before it has happened. ## AdBlue in a diesel motor, and its separate tank Not one liquid but two: that is what plenty of newer diesels near North Feltham and East Bedfont carry, with diesel feeding your motor. The exhaust, not the engine, is where AdBlue ends up: dosed into the fumes to clean it, from a separate tank. Separate tanks, different fillers. Under one flap, side by side: that's the arrangement on a lot of cars. Elsewhere, AdBlue's filler is beneath the bonnet or in the boot instead. At the petrol pump, your diesel side gets filled constantly. Far less commonly, the AdBlue side gets topped up — mostly from a bottle, by someone working out where it goes. Mistakes happen in the gap between the two. ## How AdBlue in your diesel tank occurs around North Feltham It's seldom carelessness. Three things tend to line up. Haste comes from the warning. The car warns you as AdBlue runs low, and a dry tank sends the vehicle into limp mode — so the top-up happens quickly, before work on a drive off Faggs Road, or on the way home in the car park outside The Beehive. The old car's cap is where your hand reaches — but a hire car, a new vehicle or a company car puts the fillers somewhere else. That's the second thing: a new motor. 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 tip after it has started. It takes a few seconds, be it in Hatton or bang in the centre of North Feltham. ## The AdBlue filler and the diesel filler: telling them apart Before you pour anything, whether on a drive in Hounslow West or a forecourt around North Feltham, check these. They take a few seconds. - The cap. The AdBlue cap is regularly blue, or marked "AdBlue". The diesel cap usually is not. Read it rather than going by where it sits. - Plenty of vehicles fit AdBlue the smaller filler of the two. - Open the flap and look for a label — plenty of motors show what goes in which inlet right there. - Cannot find it beside the diesel inlet? In that case check below the bonnet or inside your boot — the owner's manual will say which. - The person who drove the vehicle last. On a hire or company car collected from somewhere like the car park outside Feltham, ask before you leave, not when the light comes on. ## Topping up AdBlue without it reaching the diesel tank Anywhere in Greater London the light comes on, this is a routine for the day. - Park then switch off. Not on a slope, not with the engine running, and not in a rush on the side of Dukes Green Avenue. - Find the AdBlue filler, check the cap, and say the word "AdBlue" out loud while unscrewing it. It seems daft. It works. - Leave the diesel cap on. If both sit under one flap, check the diesel cap is still closed before you lift the bottle. - Using the bottle's own spout, tip slowly — and stop when it is full or the bottle is empty. - Shut the cap, then check once more — making sure the diesel filler stayed closed throughout. After that, start the vehicle. If at step two or three you find you have already poured into the diesel side, stop there. Never go on to stage five. ## AdBlue in your diesel tank already, around North Feltham? What follows is a short order of things, starting with no starting your motor. The fuel pump runs on many diesels as soon as your ignition goes on — and so leave it off. Do not top up with diesel to thin it: AdBlue does not mix with diesel, it sinks to the bottom of the tank, where your fuel is sucked from. At a forecourt — Tesco, Texaco or any other — the staff will usually help roll the vehicle clear, if you ask. Leave it where it is if you're on your own driveway around North Feltham. If your motor has already run, stop as soon as it is safe and switch off. Leave the M4 — under 3 miles out of North Feltham — at the next junction. Mileage counts — a short hop across North Feltham makes a smaller job than driving under 15 miles to Westminster — so say about how far it went. ## When our engineers turn up in North Feltham, what takes place? Wherever the car has stopped, whether outside Sparrow Farm Primary School, near Hatton Cross Tribunal Hearing Centre or at home, our van travels to it. What fluid was put in, the amount, and whether it ran: our technicians ask since the replies set both work and price. Nobody heads out before you've heard our price by phone. Then the tank is emptied and your system rinsed thoroughly. With AdBlue that counts more than with petrol: it crystallises and is corrosive to some of the metals in a fuel system, and so it does not wash out on its own. Once your filter has been cleaned — or replaced, if needed — fresh diesel goes in, and then your car is tested. After that our engineers fire it up and make sure it runs properly before we go. If your engine hasn't run, most jobs take about half an hour once we are there, using pumps that are safe on a working forecourt and quiet enough to use outside a house at night. Paying is on the day, not upfront, and you are given the paperwork an insurer asks for: an engineer's report and a VAT invoice. It's worth looking at your insurance as the van travels to you: misfuelling cover is included with many policies. ## About North Feltham and where it is North Feltham is a suburban area in the London Borough of Hounslow, situated near the lakes and waterways of the River Crane. North Feltham sits at an elevation of around 23 metres, with semi-detached housing being the predominant type of accommodation. North Feltham is located near several other suburban areas, including Hatton and Feltham, and is close to Hounslow Heath. North Feltham is approximately 12.7 miles from central London, with Westminster being the nearest city centre. ## AdBlue drains about North Feltham, and Greater London beyond Being a residential suburb, North Feltham shares its vans nearby areas — Feltham, Hounslow Heath — right across TW postcodes and the surrounding area around them. A postcode starting TW14 0 gets our van to you fastest. No need to move your car. Our engineers drain it where it is — a side street close to Freddie Mercury, a lay-by on the way to Dukes Green, a driveway. If you are near a boundary, or somewhere hard to describe like the back of Feltham Hira Centre, ring and ask instead of guessing. ## North Feltham people: the short version Before you pour, read the cap. AdBlue in the diesel tank after all? Leave the car off and call 0333 366 0103; Petrol in Diesel drains it on the spot, across Greater London.