--- title: Costessey: AdBlue in a Diesel Tank, Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/costessey-norfolk/ location: Costessey county: Norfolk latitude: 52.659130 longitude: 1.210110 service: AdBlue in a Diesel Tank updated: 2026-10-11 --- # Costessey: How Does AdBlue End Up in a Diesel Tank, and How Do You Avoid It? Leave the motor and ignition off then ring 0333 366 0103 now — the rest can wait when AdBlue is already in your diesel tank. Caught before your engine runs, it is normally a drain and a thorough flush, done where your car is in Costessey. Nothing happened yet? Below, the rest of the page covers the reasons it takes place and the how to prevent it for good. ## AdBlue in a diesel car, and its separate tank No single liquid but two: that's what many newer diesels around Costessey and Drayton run, with diesel for your engine. AdBlue goes to your exhaust, where it is sprayed into the gas to fresh it, and it lives in a tank of its own. Every tank comes with one filler of its own. Some motors keep the AdBlue filler in your boot or under the bonnet; a lot more have both side by side behind one flap. At the petrol pump, your diesel side gets filled constantly. Seldom filled, AdBlue normally goes in from a bottle, poured by a driver who must stop and think which cap it needs. The mistake grows in that gap between the two. ## Costessey: how AdBlue in the diesel tank takes place Carelessness rarely explains it. What does is three things lining up together. Hurry follows from the warning. Your car tells you as AdBlue runs low, and a dry tank sends the vehicle into limp mode — so the top-up gets done quickly, before work on a driveway off Townhouse Road, or on the way home in the car park outside The Harte of Costessey. New-to-you motors come next, as well. Rentals, new vehicles and company vehicles put their fillers differently, and the hand reaches for the cap it 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 tip once it has started. The same few seconds settle it, in the middle of Costessey or out in Costessey Park. ## How to tell the AdBlue filler from the diesel one Before you pour anything, whether on a driveway in Taverham or a forecourt around Costessey, check these. They take a few seconds. - Check the cap rather than going by where it sits: AdBlue ones are commonly blue or marked "AdBlue", and diesel ones usually are not. - The size. On many cars the AdBlue filler neck is the smaller of the two. - A label inside the fuel flap frequently shows which fuel goes where, on many vehicles. Look for it. - In the boot or under the bonnet: that is where your filler is if it is not by your diesel cap, and the handbook says which. - The person who drove the vehicle last. On a hire or company car picked up from somewhere like the car park outside Norwich, ask before you leave, not when the light comes on. ## Topping up AdBlue without it reaching the diesel tank The day the light comes on, wherever across Norfolk, use this routine. - Not in a rush on the side of The Street, not on a slope, not with the motor running: park then switch off properly. - Locate the AdBlue filler, check the cap, and say the word "AdBlue" aloud as unscrewing it. It seems daft. It does the trick. - The diesel cap stays on. When the two sit under a flap, confirm it's closed before the bottle comes up. - Gently does it, through the bottle's own spout, until it's full or the bottle is empty. - Close the cap and check once more. Make sure your diesel cap was never opened. Only then start the car. If at stage two or three you find you have already poured into the diesel side, stop there. Don't go on to step five. ## AdBlue in the diesel tank already, in Costessey? Short list, then. Top of that: the engine remains off. Keep your ignition off too, because on many diesels switching it on by itself runs your pump. Thinning it with extra diesel won't work, since AdBlue settles to the bottom instead of mixing — and that is where the fuel is sucked from. The staff at Total, Sainsbury's or any forecourt will normally lend a hand to push the vehicle clear if you ask. Leave it where it is if you're on your own drive in Costessey. Where your motor has run already, pull over somewhere safe and switch the vehicle off. Costessey lies over 50 miles from the M11; there, take the next junction. A short hop across Costessey is a smaller job than a run towards Norwich, under 5 miles away, so tell us about how far it went. ## Our arrival in Costessey, and what occurs next By St Augustine's Catholic Primary School, Costessey, close to Baptist Church Hall or on your own driveway: wherever your car has stopped, our technicians come to it. Both the work and the quote rest on three replies — what fluid, which quantity, and whether it's run — so our technicians ask. That quote comes over the phone, before any van leaves. After that: a drain, then a thorough flush of the whole system. AdBlue crystallises and is corrosive to some of the metals in a fuel system, so it does not wash out on its own — which is why that matters more here than with petrol. A test comes at the end: before that, clean diesel goes in, and the filter is cleaned or changed if necessary. We do not go until it has been started and is running correctly. Unrun vehicles usually need a half-hour visit after the moment we arrive. The equipment is fine on a busy forecourt, and quiet enough for a residential street late at night. No money in advance; you settle up that day. Afterwards, the VAT invoice and a report from the engineer go to you for your insurer. While we travel, take a look at your insurance documents; many carry cover for misfuelling. ## About Costessey, for a moment Costessey is a small village situated on the River Wensum in Norfolk, with Costessey being close to the city of Norwich. Costessey has a low elevation of around 9 metres above sea level and is located near several notable places, including Costessey Park and New Costessey. Costessey is characterized by its predominantly detached housing stock and rural setting, with the village being around 97 miles from London. ## AdBlue drains around Costessey and across Norfolk New Costessey and Queens Hills are among the towns near Costessey, a village, that the same vans cover, over NR postcodes. Give a postcode that starts NR8 5, and the van gets there quickest. The vehicle stays put. Our engineers drain it where it is — a side street near West End Cue Club, a lay-by on the way to Longwater Lane Recreation Ground, a drive. Ring and ask rather than assuming if you are near a boundary, or somewhere hard to explain, like the back of Our Lady and Saint Walstan. ## For Costessey people, the short version Pour no AdBlue until you have read the cap. If AdBlue has gone in your diesel tank all the same, leave it off and phone 0333 366 0103. Petrol in Diesel empties it where it waits, anywhere in Norfolk.