--- title: AdBlue in a Diesel Tank Tircoed? Read This canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/tircoed-swansea/ location: Tircoed county: Swansea latitude: 51.681850 longitude: -3.998680 service: AdBlue in a Diesel Tank updated: 2026-10-05 --- # Why It Happens and How to Avoid It: AdBlue in a Diesel Tank in Tircoed AdBlue already in the diesel tank? Then set this page aside for now, keep your ignition and engine off, and call 0333 366 0103. Normally, when your motor has not turned, it's emptied and thoroughly cleaned where the vehicle is around Tircoed. Nothing happened yet? Below, the page explains the reasons it occurs and the ways to prevent it for good. ## Why does AdBlue in a diesel car need its own filler? Not one fluid but two: that's how many modern diesels near Tircoed and Grovesend carry, with diesel for your engine. The exhaust, not your motor, is where AdBlue goes: dosed into the gas to clean it, from a separate tank. Each tank comes with one filler of its own. Many of cars have a single flap for both, while others move the AdBlue filler to the boot or under the bonnet. Diesel gets filled on every filling station call-out, week in, week out. Rarely topped up, AdBlue normally goes in from a bottle, tipped by a driver who must stop and think what filler it needs. The mistake grows in the gap between them. ## AdBlue in your diesel tank in Tircoed: how it happens Three things tend to line up, and carelessness is seldom one of them. The warning comes first. As AdBlue runs low the vehicle tells you, and if it runs out completely, the car drops into limp mode. So the top-up is done in a hurry: on a drive off Heol Tircoed before work, or in the car park outside The Old Inn on the way home. The old car's cap is where the hand goes — but a hire car, a new motor or a company car keeps the fillers elsewhere. That is the second thing: a new vehicle. A spouted bottle finds no obstacle at a diesel filler any more than at an AdBlue one. So the pour, after started, keeps on. Whether it happens in Penllergaer or the middle of Tircoed, it's the same few seconds. ## How to tell the AdBlue filler from the diesel one A couple of seconds is all these take — so check them before you tip anything, on a driveway in Llangyfelach or a forecourt in Tircoed. - Colour and lettering: an AdBlue cap is commonly blue, or says "AdBlue", where a diesel cap normally doesn't. Trust the cap, not its position. - The size. On many cars the AdBlue filler neck is the smaller of the two. - Open the filler flap and check for a label — many vehicles show what belongs in which inlet right there. - The handbook. If the filler isn't by the diesel cap, it's in the boot or under the bonnet, and the handbook says which. - Ask the person who drove it last — before you leave, not when the light comes on — when you pick up a hire or company car from somewhere like the car park outside Gowerton. ## Keeping AdBlue out of your diesel tank when you top up A routine for the day the light comes on, wherever across Swansea that is. - Not in a rush on the side of Y Cyswllt, not on a slope, not with your engine running: park and switch off properly. - Silly as it sounds, speaking "AdBlue" out loud as you unscrew the cap does the trick — once you've found the filler and read the cap. - If both sit under one flap, check the diesel cap is still closed before you lift the bottle — then leave the vehicle on. - Using the bottle's own spout, tip slowly — and stop when it is full or the bottle is empty. - Close the cap and check a second time. Make sure the diesel cap was never opened. Only then start your car. If at step two or three you find you have already poured into the diesel side, stop there. Leave out stage five entirely. ## Put AdBlue in your diesel tank in Tircoed already? What follows is a short order of things, beginning with no starting your motor. Don't switch the ignition on; on many 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. Ask the attendants to help push the car clear of the petrol pump if you're on a forecourt — the the nearest petrol station, the BP or anywhere else. Your own drive in Tircoed is the place it stays. If your motor has already run, stop as soon as it is safe and switch off. Tircoed lies under a mile from the M4; on it, use the next junction. Tell us about how far it went: a run towards Swansea, under 5 miles away, is a bigger job than a short hop across Tircoed. ## Our arrival around Tircoed, and what takes place next The van reaches the vehicle wherever it has come to rest — your own driveway, near J.D. Llewellyn's Equatorial Observatory, or by the local primary school. We ask what got in, roughly how much, and if it has run, since those answers determine this work and the price. During the phone call itself, you are told our price — before dispatch. Then the tank is drained and the fuel system cleaned thoroughly. Unlike petrol, AdBlue leaves crystals and eats at some fuel-system metals, and none of that washes away unaided. That is why it counts more. Filter flushed or, where needed, replaced; clean diesel in; then a check of your vehicle. Before we go, our technicians fire it up and make sure that it is running smoothly. Unrun cars mostly need a half-hour visit after the moment we arrive. The kit is safe on a live filling station, and hushed enough for a residential street after dark. Your insurer will ask for the engineer's report and the VAT invoice, and you get both at the end. Payment comes on the day, with no deposit. Many insurance policies include misfuelling cover, and so it's worth checking yours whilst we are on the way. ## About Tircoed Tircoed is a village situated on the banks of a river in Swansea, with a relatively low elevation of 64 metres. Tircoed lies close to the nearby villages of Penllergaer and Pontlliw, and is approximately 4.9 miles from the city of Swansea. Tircoed has a population of around 1145 people, predominantly living in detached houses. Tircoed is located in a scenic area, with Bach-y-gwreiddyn nearby. ## Tircoed and Swansea: AdBlue drains across the area Being a village, Tircoed has the same vans as surrounding areas — Bach-y-gwreiddyn, Pontlliw — all the way across SA postcodes and the surrounding area around them. A postcode starting SA4 9 gets the van to you fastest. Your car remains put. Our technicians drain it where it is — a side street close to Penllergaer Old School, a lay-by on the way to Penbwl Wood, a drive. Ring and ask rather than assuming if you are close to a boundary, or somewhere hard to explain, like the back of Neuadd Llewelyn. ## In short, for Tircoed people Tip nothing till you've read the cap. Still AdBlue in the diesel tank? Petrol in Diesel can drain it where it stands, wherever around Swansea: switch the vehicle off and call 0333 366 0103.