--- title: AdBlue in a Diesel Tank Codsall: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/codsall-staffordshire/ location: Codsall county: Staffordshire latitude: 52.630520 longitude: -2.200970 service: AdBlue in a Diesel Tank updated: 2026-10-10 --- # Codsall: How Does AdBlue End Up in a Diesel Tank, and How Do You Prevent It? Pause reading for a moment when the diesel tank already has AdBlue in it: ignition off, engine off, then call 0333 366 0103. A drain plus a thorough flush, carried out just where the vehicle stands in Codsall, is usually what it takes when caught before the motor runs. Reading in advance? In that case the rest covers why it comes about and how to stop it ever happening. ## AdBlue in a diesel motor, and its separate tank Not one liquid but two: that's what many newer diesels around Codsall and Bilbrook run, with diesel for the motor. Kept in a tank of its own, AdBlue is fed into the exhaust stream to clean it. There's a filler for each tank. On a lot of cars the two sit side by side under the same flap; on others the AdBlue filler is in the boot or under the bonnet. Diesel goes in on every filling station call-out, week in, week out. The AdBlue side is filled far less regularly, usually from a bottle, and normally by someone who has to stop and think where it goes. The error lives in that gap. ## Codsall: how AdBlue in the diesel tank happens Three things tend to come together, and carelessness is rarely one of them. The warning comes first. As AdBlue runs low the vehicle tells you, and if it runs out altogether, the car drops into limp mode. So the top-up is done in a hurry: on a driveway off Station Road before work, or in the car park outside The Bull on the way home. Then the car is unfamiliar. A hire car, a new car or a company car puts the fillers where your last one did not, and the hand reaches for the cap it would have used on the old one. Third, the bottle goes in: a diesel filler or AdBlue one, it slides in as easily, and once the tip begins, no part halts it. The same few seconds settle it, in the middle of Codsall or out in Oaken. ## The AdBlue filler and the diesel filler: telling them apart A couple of seconds is all these take — so run through them before you tip anything, on a driveway in Kingswood Common or a forecourt around Codsall. - Blue and marking: an AdBlue cap is frequently blue, or says "AdBlue", where a diesel cap usually doesn't. Go by the cap, not where it sits. - On many motors, the size gives it away: AdBlue gets the smaller filler neck. - Open the filler flap and check for a label — plenty of vehicles show which belongs in each inlet just there. - In the boot or under the bonnet: that is where your filler sits if it's not by the diesel cap, and the handbook tells you which. - Ask the person who drove it last — before you leave, not when the light comes on — if you pick up a hire or company car from somewhere like the car park at the nearest station. ## Keeping AdBlue out of the diesel tank when you top up Wherever across Staffordshire the light comes on, this is a routine for that day. - Not in a rush on the side of Wood Road, not on a slope, not with the engine running: park and switch off properly. - Silly as it sounds, saying "AdBlue" aloud as you unscrew the cap does the trick — once you've located your filler and read it. - Both under one flap? Then confirm the lid on your diesel filler stays closed ahead of lifting the bottle. - Using the bottle's own spout, tip slowly — and stop when it's full or the bottle is empty. - Before starting the car, close the cap and look again that the diesel cap never opened off. Find at the second or third stage that AdBlue went in the wrong filler? That is where you stop. Never carry on to stage five. ## Put AdBlue in your diesel tank around Codsall already? Do not start the motor: that is where the short order of things begins. Don't switch the ignition on; on plenty of diesels that alone runs the fuel pump. AdBlue doesn't mix with diesel — it sinks to the bottom of that tank, where your fuel is sucked from — so do not top up with diesel to thin it. Ask the staff to help roll your car away from the pump if you're on a forecourt — the Esso, the Sainsbury's or somewhere else. Leave it where it is if you're on your own drive around Codsall. When your motor has run already, pull over safely then switch the car off. Come off the M54 — under a mile out of Codsall — at the next junction. A short hop across Codsall is a smaller job than a run towards Wolverhampton, under 5 miles away, so tell us about how far it went. ## Codsall: what takes place when we turn up The van reaches the car anywhere it stopped — your own drive, beside The Lone Singer, or by St Nicholas Church of England First School. The replies decide this work and our price, and so our engineers ask what went in, roughly how much, and if it's run. During the call itself, you are told our quote — before dispatch. Your system is then cleaned thoroughly, after that tank is emptied. With AdBlue that matters more than with petrol: it crystallises and is corrosive to some of the metals in a fuel system, so it does not wash out on its own. Your filter is cleaned, or replaced where it needs to be; clean diesel goes in; and the vehicle is tested. After that we start it and make sure it runs properly before leaving. Most jobs are done in roughly half an hour once our technicians get there, as long as the motor has not run — and the pumps our engineers use are safe on a live forecourt and quiet at night outside a house. You pay on the day, with nothing upfront, and get a VAT invoice and an engineer report for your insurer. While we travel, have a look at your insurance documents; many carry cover for misfuelling. ## About Codsall itself Codsall is a village in southern Staffordshire, situated on the River Penk and near the Shropshire border. Codsall sits at an elevation of around 127 metres, with nearby settlements including Oaken, Gunstone, and Lane Green. Codsall is characterized by its predominantly detached housing stock and is located close to the city of Wolverhampton, approximately 4.3 miles away. Codsall has a population of around 2634 residents, according to recent estimates. ## AdBlue drains around Codsall, and Staffordshire beyond Gunstone and Lane Green are among the places near Codsall, a village, that the same teams cover, over WV postcodes. Our van gets to you fastest with a postcode starting WV8 1. The car does not need to shift. Our engineers drain it where it is — a side street near Codsall Parish Council, a lay-by on the way to Wheel Field, a driveway. If you're near a boundary, or somewhere hard to explain like the back of Welcome to Codsall, ring and ask instead of assuming. ## Codsall drivers: the short version Tip no AdBlue till you've read the cap. If AdBlue has gone in your diesel tank anyway, leave the vehicle off and call 0333 366 0103. Petrol in Diesel empties it where it stands, anywhere around Staffordshire.