--- title: AdBlue in a Diesel Tank Upper Church Village: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/upper-church-village-rhondda-cynon-taf/ location: Upper Church Village county: Rhondda Cynon Taf latitude: 51.569920 longitude: -3.321610 service: AdBlue in a Diesel Tank updated: 2026-10-01 --- # Upper Church Village: How Does AdBlue End Up in a Diesel Tank, and How Do You Prevent It? Leave the motor and ignition off and phone 0333 366 0103 first — reading can wait when AdBlue is already in the diesel tank. Caught before your engine runs, it is usually a drain and a thorough flush, done where your car is in Upper Church Village. Here before the event? Then what follows explains how it happens and what to prevent it happening at all. ## Two fillers, two tanks: AdBlue in a diesel car Plenty of current diesels on the roads around Upper Church Village and Hawthorn carry two liquids, not one. Diesel goes to the engine. AdBlue goes to the exhaust, where it is sprayed into the gas to fresh it, and it lives in a tank of its own. Each tank has one filler of its own. Plenty of cars share a single flap for both, whereas others move the AdBlue filler to the boot or under the bonnet. At the pump, your diesel side is topped up all the time. Far less frequently, the AdBlue side gets topped up — mostly from a bottle, by someone working out where it goes. That gap is where the error lives. ## How AdBlue in the diesel tank takes place in Upper Church Village Three things tend to come together, and carelessness is rarely one of them. The warning comes first. As AdBlue runs low your car tells you, and if it runs out completely, the car goes into limp mode. So the top-up is done in a hurry: on a drive off Castle Court before work, or in the car park outside Clwb Cymdeithasol Llanilltud Faerdref on the way home. Unfamiliar motors come second, as well. Rentals, new cars and company motors place their fillers in new places, and habit reaches for the cap it used on the old one. Nothing stops the pour after it has started, because a bottle with a spout goes into a diesel filler as readily as an AdBlue one. The bottle fits. The same few seconds decide it, in the middle of Upper Church Village or out in Church Village. ## How to tell the AdBlue filler from the diesel one Check these before pouring, at a forecourt in Upper Church Village or a drive over in Treforest. A few seconds, that's all. - Colour and marking: an AdBlue cap is regularly blue, or says "AdBlue", where a diesel cap normally doesn't. Trust the cap, not where it sits. - On many vehicles, size tells: AdBlue has the smaller filler neck. - Lift the filler flap and check for a label — plenty of motors show what goes in which inlet just there. - In your boot or under the bonnet: that's where your filler sits if it is not by your diesel cap, and the handbook says which. - Whoever had it before will know. Ask when you collect a hire car or fleet car — from Trefforest Estate's car park, perhaps — not when the warning appears. ## AdBlue top-ups that never reach your diesel tank The day the light goes on, anywhere in Rhondda Cynon Taf, follow this routine. - Stop somewhere level, motor off, with time in hand — never hurried on the side of Wellfield Court. - Daft as it sounds, speaking "AdBlue" out loud while you unscrew the cap works — after you have found the filler and read it. - Leave your diesel cap on. If both sit under one flap, check the diesel cap is still closed before you lift the bottle. - Pour slowly, using the bottle's own spout. Stop when it is full or when the bottle is empty. - Only then, start the car: close the cap, check again, and make sure your diesel cap was never opened. If at step two or three you find you have already poured into your diesel side, stop there. Stage five stays off limits. ## Already put AdBlue in the diesel tank around Upper Church Village? Then the order of things is short. Don't start the engine. On many diesels the ignition alone runs the fuel pump, and so do not switch the vehicle on. Diluting it with more diesel won't work, because AdBlue sinks to the bottom rather than blending — and that is where your fuel is drawn from. The attendants at Esso, Tesco or another forecourt will usually lend a hand to push the vehicle clear if asked. If you are on your own drive around Upper Church Village, leave the vehicle where it is. Already run? Stop once it's sensible, then switch off. Come off the M4 — under 5 miles out of Upper Church Village — at the first exit. Distance matters — a quick hop across Upper Church Village makes a smaller job than heading under 10 miles towards Cardiff — so tell us roughly how far it went. ## Our arrival in Upper Church Village, and what occurs next The van reaches the vehicle wherever it has come to rest — your own driveway, near Canolfan Hamdden Llanilltud Faerdref, or outside the local primary school. Both the work and the quote rest on three answers — what liquid, what quantity, and whether it has run — so we ask. No one heads out before you have had the quote by phone. After that: a drain, then a thorough flush of the entire system. 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 flushed, or replaced where it needs to be; clean diesel goes in; and the car is tested. The engine is fired up next and checked to confirm it runs smoothly, all before our technicians leave. Using pumps fine on a busy forecourt and quiet enough to use outside a house at night, most jobs in which the motor has not run take roughly half an hour after we arrive. Payment is on the day, not upfront, and you are given the paperwork an insurer asks for: an engineer report and a VAT invoice. Before we get there, take a look at your insurance documents; many include cover for misfuelling. ## About Upper Church Village, for a moment Upper Church Village is a locality situated on the banks of a river in Rhondda Cynon Taf, with a mix of semi-detached housing and other residential properties. Upper Church Village has a population of around 3108 people and is located near other communities such as Church Village and Ton-Teg. Upper Church Village sits at an elevation of 119 metres, close to the Welsh capital city of Cardiff, which is about 8.8 miles away. Upper Church Village is part of a wider urban area that has developed along the riverside in this part of Wales. ## AdBlue drains across Rhondda Cynon Taf, Upper Church Village included Upper Church Village is a small village, and the vans that cover it also work the places near it, Ton-Teg and Dyffryn Dowlats among them, across the CF postcode area. A postcode starting CF38 1 gets the van to you fastest. The vehicle remains put. Our engineers drain it where it is — a side street close to Rhydyfelin Methodist Church, a lay-by on the way to Parc Canol, a driveway. Ring and ask rather than guessing if you are close to a boundary, or somewhere hard to describe, like the back of Climbing Station. ## For Upper Church Village motorists, the short version Pour nothing until you have read the cap. Petrol in Diesel empties it on the spot, anywhere around Rhondda Cynon Taf, if AdBlue has gone in your diesel tank regardless — so leave it off then call 0333 366 0103.