--- title: Gibbonsdown: AdBlue in a Diesel Tank, Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/gibbonsdown-the-vale-of-glamorgan/ location: Gibbonsdown county: The Vale of Glamorgan latitude: 51.419060 longitude: -3.264970 service: AdBlue in a Diesel Tank updated: 2026-10-08 --- # AdBlue in a Diesel Tank in Gibbonsdown: Why It Happens and How to Stop It If AdBlue is already in your diesel tank, stop reading for a moment: leave your engine and the ignition off and ring 0333 366 0103. Around Gibbonsdown, catching it before the motor turns normally means a drain and a thorough flush on the spot. The rest of this page covers why it occurs and how to ensure it doesn't — useful if you're reading ahead of time. ## Why does AdBlue in a diesel vehicle need its own filler? Not one fluid but two: that's what many newer diesels around Gibbonsdown and Barry Dock run, with diesel for the motor. Your exhaust, not your engine, is where AdBlue ends up: sprayed into the fumes to clean them, from a separate tank. Different tanks, different fillers. Many of motors have a single flap for the two, whereas others put the AdBlue filler to the boot or under the bonnet. Diesel goes in on every filling station call-out, week in, week out. Rarely filled, AdBlue usually comes out of a bottle, tipped by someone who has to stop and think which filler to use. That gap is where the mistake lives. ## How AdBlue in your diesel tank takes place around Gibbonsdown It is hardly ever carelessness. Three things tend to line up. On a driveway off Ogmore Place before work, or in the car park outside Master Mariner heading home: that's where the hurried top-up takes place. Why the rush? As AdBlue runs low the car warns you, and if it is empty, limp mode follows. The old car's cap is where the hand reaches — but a rental car, a new car or a company car puts the fillers elsewhere. That's the second factor: a strange car. Lastly, the spout fits: diesel filler or AdBlue one, it goes in as easily, and once the pour begins, no part halts it. The same few seconds decide it, in the middle of Gibbonsdown or out in Merthyr Dyfan. ## Which filler is for AdBlue, and which for diesel? Before you pour anything, whether on a drive in Colcot or a forecourt in Gibbonsdown, check these. They take a couple of seconds. - Where it sits can mislead; the cap doesn't. AdBlue caps tend to be blue or carry the word "AdBlue" — diesel ones usually do not. - Check the size: the smaller neck is, on plenty of motors, the AdBlue one. - Look inside your fuel flap: many motors have a label there saying which fuel goes where. - Can't see it beside your diesel inlet? In that case look below the bonnet or in the boot — the handbook says which. - Whoever had it before will know. Ask as you collect a rental or company car — from Cadoxton's car park, say — not once the light comes on. ## Keeping AdBlue out of the diesel tank when you top up The day the light comes on, anywhere in The Vale of Glamorgan, use this routine. - Not in a rush on the side of Ewenny Close, not on a slope, not with your motor running: park then switch off first. - Say "AdBlue" out loud as you unscrew the cap, after finding the AdBlue filler and reading it. Silly, perhaps, yet it does the trick. - The diesel cap remains on. Where the two share a flap, make sure it's shut before the bottle comes up. - Slowly is best, through the bottle's own spout, till it is full or the bottle is empty. - Close the cap and check again. Make sure the diesel cap was never opened. Only then start the car. If at step two or three you find you have already poured into your diesel side, stop there. Don't go on to step five. ## Put AdBlue in the diesel tank in Gibbonsdown already? Short list, then. First: your engine remains off. Keep the ignition off too, because on plenty of diesels switching it on alone starts the fuel pump. AdBlue does not mix with diesel — it sinks to the bottom of that tank, where your fuel is pulled from — so don't top up with diesel to thin it. On a forecourt — Texaco, Morrisons or any other — the staff will usually help roll your car away, if you ask. On your own drive in Gibbonsdown? Then the vehicle remains put. Already run? Pull over when it is safe, then switch off. Gibbonsdown sits under 10 miles from the M4; there, use the next junction. A short hop across Gibbonsdown is a smaller job than a run towards Cardiff, under 10 miles away, so tell us about how far it went. ## What occurs when our technicians turn up around Gibbonsdown Our technicians come to your car wherever it has stopped, whether that is outside the local primary school, near Gibbonsdown Community Centre or on your own driveway. What liquid got in, the quantity, and whether it ran: our technicians ask since the answers set the work and price. On the call itself, you are told our quote — before dispatch. Draining the tank comes next, then a full flush of your system. More than with petrol, it counts here: crystals build up, some metals are attacked, and nothing clears out unaided, no matter how long it sits. The filter cleaned or, where it must be, replaced; clean diesel in; then a test of your vehicle. Then we fire it up and check it runs correctly before we leave. If the engine has not run, the majority of jobs take about half an hour once we're there, using pumps that are fine on a busy forecourt and quiet enough to use outside a house at night. Your insurer usually wants the engineer's report and your VAT invoice, and you get both once this job is done. Payment is on the day, with no money upfront. Wrong-fuel cover is part of plenty of insurance policies — so use the wait to check yours. ## About Gibbonsdown, for a moment Gibbonsdown is a suburban area in The Vale of Glamorgan, situated near the coast and approximately 5.7 miles from Cardiff. Gibbonsdown has a relatively low elevation of 49 metres and is characterized by semi-detached housing. Gibbonsdown is close to nearby places such as Merthyr Dyfan, Cadoxton, and Palmerstown, and is part of the wider Cardiff urban area. ## AdBlue drains in Gibbonsdown and across The Vale of Glamorgan Cadoxton and Palmerstown are among the places around Gibbonsdown, a residential suburb, that the same vans cover, throughout CF postcodes. A postcode starting CF63 1 gets our van to you fastest. Your car does not need to move. Our technicians drain it where it is — a side street near Merthyr Dyfan (Church in Wales), a lay-by on the way to Reservoir Fields, a drive. If you're near a boundary, or somewhere hard to describe like the back of Colocot Community Centre, ring and ask instead of guessing. ## In short, for Gibbonsdown people Before you pour, read the cap. If AdBlue has gone in your diesel tank regardless, leave the car off and call 0333 366 0103. Petrol in Diesel empties it where it stands, anywhere across The Vale of Glamorgan.