--- title: Explained: AdBlue in a Diesel Tank Newtown canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/newtown-gloucestershire-gl20-8/ location: Newtown county: Gloucestershire latitude: 51.997150 longitude: -2.128610 service: AdBlue in a Diesel Tank updated: 2026-10-27 --- # Preventing AdBlue in a Diesel Tank in Newtown: Why It Happens Keep the motor and ignition off then ring 0333 366 0103 now — the rest can wait if AdBlue is already in the diesel tank. Caught before your motor runs, it is generally a drain and a thorough flush, done where the vehicle is around Newtown. If you're reading before it has happened, the rest of this page is about why it takes place and how to make sure it doesn't. ## AdBlue in a diesel car: two tanks, two fillers No single liquid but two: that is what many modern diesels around Newtown and Homedowns carry, with diesel feeding the engine. Kept in a tank of its own, AdBlue is sprayed into your exhaust gas and cleans it. Separate tanks, separate fillers. Many of cars share a single flap for both, while others move the AdBlue filler to the boot or under the bonnet. At the pump, your diesel side is topped up all the time. The AdBlue side is filled far less frequently, normally from a bottle, and usually by a person who has to stop and think where it goes. The error lives in that gap. ## Newtown: how AdBlue in the diesel tank takes place Carelessness seldom causes it. What does is three things coming up together. The warning comes first. As AdBlue runs low the vehicle tells you, and if it runs out completely, your vehicle goes into limp mode. So the top-up is done in a hurry: on a drive off Shannon Way before work, or in the car park outside The Canterbury on the way home. Next, your hand reaches for the cap it knew on the old motor — because a rental car, a new vehicle or a company car places the fillers somewhere your last one did not. Lastly, the bottle fits: a diesel filler or AdBlue filler, it goes in as easily, and after the tip begins, no part halts it. Whether it happens in Walton Cardiff or the middle of Newtown, it is the same few seconds. ## The AdBlue filler and the diesel filler: telling them apart Whether a Newtown forecourt or a drive over in Ashchurch, take a few seconds over these before any is poured in. - The cap. The AdBlue cap is often blue, or marked "AdBlue". Your diesel cap normally isn't. Read it rather than going by position. - Many motors fit AdBlue the smaller filler of the two. - Lift the filler flap and check for a label — plenty of vehicles mark what belongs in each inlet just there. - The handbook. If your filler isn't by your diesel cap, it's in the boot or under the bonnet, and the handbook says which. - Collecting a hire or company car, say at the car park at Ashchurch for Tewkesbury? Check with whoever drove the vehicle last before leaving, not once the light goes on. ## How to top up without AdBlue in the diesel tank A routine for the day the light comes on, wherever in Gloucestershire that is. - Switch off once parked — level ground, motor off, and not in a rush beside Ashchurch Road at the roadside. - Say "AdBlue" out loud as you unscrew the cap, after finding the AdBlue filler and reading it. Silly, yes, yet it works. - If both sit under one flap, check your diesel cap is still closed before you lift the bottle — and leave the vehicle on. - Slowly does it, through the bottle's own spout, till 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 vehicle. Find at step two or three that it's already gone into the diesel side? Then stop right there. Step five is out. ## AdBlue in the diesel tank already, in Newtown? Brief list, then. First: the motor stays off. Don't switch the ignition on; on plenty of diesels that alone runs the fuel pump. Do not top up with diesel to thin it: AdBlue does not mix with diesel, it sinks to the bottom of that tank, where the fuel is drawn from. The staff at Gulf, BP or another forecourt will usually lend a hand pushing the vehicle away when asked. Your own drive around Newtown is the place it stays. If the engine has already run, stop as soon as it is safe and switch off. On the M5, under a mile from Newtown, that means the next exit. Roughly how far did it go? Hopping across Newtown is less a job than a trip of under 15 miles to Gloucester, so say. ## Newtown: what takes place when we turn up Our engineers come to your car wherever it has stopped, whether that's outside Tirlebrook Primary School, close to Tewkesbury School Sports Centre or on your own driveway. Our technicians ask what went in, roughly how much, and whether it's run, since the answers decide this work and the price. On the call itself, you are told the quote — before dispatch. Emptying the tank comes next, followed by a thorough flush of your system. Much more than with petrol, it counts here: the crystals form, some metals corrode, and nothing clears out unaided, no matter how long it is left. Once your filter is flushed — or renewed, where needed — fresh diesel is added, and then the car gets tested. Before we leave, our engineers start the engine and make sure that it is running properly. Most jobs are done in roughly half an hour once we get there, provided your engine hasn't run — and the pumps our technicians use are fine on a busy forecourt yet 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. It is worth checking your policy as the van travels to you: misfuelling cover is included with plenty of policies. ## About Newtown and where it is Newtown is a suburban area in Gloucestershire, situated on the riverside at an elevation of 18 metres, with semi-detached housing being the predominant type. Newtown lies near the cities of Gloucester and the surrounding villages of Walton Cardiff and Mitton. Newtown is part of the wider residential area around Gloucester, with easy access to the city centre. Newtown has a population of approximately 1041 residents. ## AdBlue drains about Newtown, and Gloucestershire beyond Newtown is a new town, and our teams that cover it also work the towns around it, Mitton and Northway among them, across the GL postcode area. The van reaches you fastest with a postcode starting GL20 8. Your car doesn't need to move. A drive, a lay-by on the way to Milne's Covert, a side street close to Northway Village Hall: we drain the car where it is. Ring and ask rather than assuming if you are near a border, or somewhere hard to describe, like the back of The Boys' Brigade Community Centre. ## The short version for Newtown motorists Read the cap before you tip. Petrol in Diesel empties it on the spot, anywhere around Gloucestershire, if AdBlue has gone in your diesel tank regardless — so leave the car off and ring 0333 366 0103.