--- title: AdBlue in a Diesel Tank Friday Hill: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/friday-hill-greater-london/ location: Friday Hill county: Greater London latitude: 51.622070 longitude: 0.008280 service: AdBlue in a Diesel Tank updated: 2026-10-16 --- # How It Happens and How to Avoid It: AdBlue in a Diesel Tank in Friday Hill Pause reading for a moment when your diesel tank already holds AdBlue in it: ignition off, motor off, and phone 0333 366 0103. Usually, if the engine hasn't run, it is drained and thoroughly cleaned where the car is around Friday Hill. If you're 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 motor, and its separate tank Diesel goes to your engine — but plenty of modern diesels driven round Friday Hill and Highams Park hold another liquid as well. Kept in a tank of its own, AdBlue is fed into the exhaust stream and cleans it. Each tank has its own filler. Other vehicles keep the AdBlue filler in the boot or under the bonnet; a lot of others have the two side by side under one flap. At the pump, the diesel side is topped up all the time. The AdBlue side is filled far less regularly, usually from a bottle, and usually by somebody who has to stop and think where it goes. The mistake grows in the gap between them. ## Friday Hill: how AdBlue in the diesel tank happens It is rarely carelessness. Three things tend to line up. On a driveway off Friday Hill East before work, or in the car park at The Dovecote on the way home: that's where the hurried top-up takes place. Why the rush? As AdBlue gets low your car tells you, and once it's empty, limp mode kicks in. Then, the hand reaches for the cap it would have used on the old car — since a rental car, a new motor or a company car puts the fillers where your last one did not. 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. It takes seconds, be it in Chingford Hatch or right in the heart of Friday Hill. ## Telling the AdBlue filler from your diesel filler A couple of seconds is all these take — so check them before you pour anything, on a driveway in Woodford Wells or a forecourt in Friday Hill. - Position can mislead; the cap doesn't. AdBlue caps tend to be blue or bear the name "AdBlue" — diesel ones normally don't. - The size. On plenty of motors the AdBlue filler neck is the smaller of the two. - Open the flap and look for a label — plenty of cars show which belongs in each inlet right there. - The handbook says where it lives when the filler is not next to the diesel cap: the 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 Chingford. ## AdBlue top-ups that never reach your diesel tank On the day the warning appears — wherever it is around Greater London — a simple routine to follow. - Park and switch off. Not on a slope, not with your motor running, and not in a rush on the side of Friday Hill. - Daft as it sounds, speaking "AdBlue" aloud while you unscrew the cap works — after 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 — then leave the vehicle on. - Finish when your tank fills or the bottle runs dry; until then, pour gently through the own spout. - Close the cap, then check again — confirm the diesel cap remained shut the whole time. Only then, start the car. Spot at step two or three that it's already gone into your diesel side? So stop just there. Stage five stays off limits. ## AdBlue in your diesel tank already, around Friday Hill? The short order of things, beginning with no starting the motor. On many diesels your ignition alone runs the fuel pump, and so do not switch the car on. Don't top up with diesel to dilute it: AdBlue doesn't mix with diesel, it sinks to the bottom of your tank, where the fuel is drawn from. Ask the staff to help roll the vehicle away from the petrol pump if you're on a forecourt — the Esso, the Shell or somewhere else. Your own driveway in Friday Hill is the place it stays. If the motor has already run, stop as soon as it is safe and switch off. Friday Hill sits under 3 miles from the M11; there, take the next exit. About how far did it go? Crossing Friday Hill is less work than a run of under 10 miles towards London, so tell us. ## What takes place when we get there in Friday Hill By Longshaw Primary Academy, near Coney Burrows Community Centre or on your own driveway: wherever the vehicle has stopped, our engineers come to it. Both the work and the quote rest on three replies — what liquid, what quantity, and whether it has run — so we ask. You hear that quote by phone, before anyone sets off. Then your tank is cleared 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 doesn't wash out on its own. Once your filter has been flushed — or replaced, where required — fresh diesel goes in, and finally your vehicle gets tested. Before leaving, our engineers start the car and confirm that it is running smoothly. Unrun cars usually mean a half-hour job from the moment we arrive. The equipment is fine on a live forecourt, and quiet enough for a driveway late at night. You pay on the day, with nothing upfront, and get a VAT invoice and an engineer report for your insurer. Many insurance policies include misfuelling cover, and so it is worth checking yours while we're on the way. ## About Friday Hill itself Friday Hill is a suburban area in the London Borough of Waltham Forest, situated near the River Lea and close to the Epping Forest. Friday Hill sits at an elevation of around 46 metres, with semi-detached housing being the predominant type of accommodation in the area. Friday Hill is located near several other suburban areas, including Chingford Hatch, Chingford, and Chingford Green, and is approximately 9.8 miles from central London. ## AdBlue drains about Friday Hill, and Greater London beyond Chingford and Chingford Green are among the places near Friday Hill, a residential suburb, that the same teams cover, over E postcodes. Fastest of all: quote a E4 6 postcode for the van. The vehicle doesn't need to shift. A driveway, a lay-by on the way to Pimp Hall Park, a side street near St Anne's Parish Centre: our engineers drain the vehicle where it stands. Ring and ask rather than guessing if you're near a boundary, or somewhere hard to explain, like the back of St Anne's. ## For Friday Hill motorists, the short version First, the cap; then, the tip. If AdBlue has gone in your diesel tank regardless, leave the vehicle off then call 0333 366 0103. Petrol in Diesel empties it where it stands, anywhere in Greater London.