--- title: AdBlue in a Diesel Tank Blaina? Read This canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/blaina-blaenau-gwent/ location: Blaina county: Blaenau Gwent latitude: 51.766140 longitude: -3.160080 service: AdBlue in a Diesel Tank updated: 2026-10-22 --- # AdBlue in a Diesel Tank in Blaina: Why It Occurs and How to Avoid It If AdBlue is already in your diesel tank, stop reading for a moment: leave the engine and your ignition off then phone 0333 366 0103. Around Blaina, catching it before the motor runs usually leaves draining and a full flush on the spot. Nothing happened yet? Further down, the rest of the page explains the why it occurs and the ways to prevent it for good. ## AdBlue in a diesel vehicle: two tanks, two fillers Diesel goes to the motor — yet many modern diesels seen about Blaina and Coalbrookvale hold a second liquid too. Kept in a tank of its own, AdBlue is sprayed into your exhaust gas and cleans it. Every tank comes with one filler of its own. On a lot of cars the two sit side by side under the same flap; on others the AdBlue filler is in your boot or under the bonnet. The diesel side is fuelled at the petrol pump all the time. A driver who has to stop and think where it goes normally fills the AdBlue side, from a bottle, and much less commonly. Mistakes happen in that gap between them. ## AdBlue in the diesel tank around Blaina: how it happens Three things tend to line up, and carelessness is rarely one of them. On a driveway off Queen Street before work, or in the car park outside Bush Inn on the way home: that is where the hurried top-up happens. What is the reason for the rush? As AdBlue gets low the vehicle warns you, and if it's empty, limp mode kicks in. Unfamiliar vehicles come second, as well. Hire cars, new vehicles and company cars place their fillers in new places, and habit reaches for the cap it used on the old one. No part stops the tip once it has started, because a bottle with a spout goes into a diesel filler as easily as an AdBlue one. The bottle fits. Whether it takes place in West Side or the middle of Blaina, it's the same few seconds. ## Telling the AdBlue filler from the diesel filler Be it a Blaina forecourt or a driveway out in Nantyglo, spend a couple of seconds on these before any goes in. - Where it sits misleads; the cap doesn't. AdBlue caps tend to be blue or bear the word "AdBlue" — diesel caps normally don't. - Look at the size: the smaller neck is, on plenty of cars, the AdBlue one. - A label inside your fuel flap frequently says which fuel goes where, on plenty of motors. Look for it. - The handbook shows where it is if your filler isn't next to the diesel cap: the boot, or under the bonnet. - The previous driver knows. Check when you pick up a rental or company car — from Ebbw Vale Parkway's car park, say — rather than when the light comes on. ## Keeping AdBlue out of the diesel tank when you top up The day the light comes on, anywhere around Blaenau Gwent, use this routine. - Stop on level, motor off, with time to spare — not hurried on the side of Hope Street. - Silly as it sounds, saying "AdBlue" aloud as you unscrew the cap works — after you've located the filler and read the cap. - The diesel cap remains on. Where the two share a flap, make sure it's shut before the bottle comes up. - Using the bottle's own spout, tip slowly — and stop when it's full or the bottle is empty. - Shut the cap, and check again — making sure the diesel cap remained closed the whole time. Only then, start the vehicle. Find at the second or third step that the bottle went into the diesel tank? That is where you stop. Don't go on to step five. ## Already put AdBlue in your diesel tank around Blaina? Then the order of things is short. Do not start the engine. On many diesels your ignition alone runs the fuel pump, and so don't switch the vehicle on. 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. If you're on a forecourt, whether it is the Texaco or the Gulf, ask the attendants to help roll your car away from the pump. On your own drive around Blaina? So your car stays where it is. Where your motor has been run already, pull over safely then switch it off. Leave the M4 — under 15 miles out of Blaina — at the first junction. Roughly how far did it go? Crossing Blaina is less work than a run of under 15 miles towards Newport, and so say. ## What happens when our technicians turn up around Blaina Anywhere the vehicle has stopped, whether by the local primary school, beside Salem Chapel or on your own drive, the van comes to it. The replies decide this work and our quote, so we ask what got in, roughly how much, and if it has run. No one sets off until you have had the price over the phone. Next: a drain, then a thorough flush of the entire system. Unlike petrol, AdBlue forms crystals and attacks certain fuel-system metals, and none of it washes out by itself. That is why it matters more. Testing comes last: before that, clean diesel goes in, and the fuel filter is cleaned or replaced as needed. Before leaving, our engineers fire it up and check that it is running smoothly. If the motor hasn't run, most jobs take about half an hour once we are there, using pumps that are fine on a busy forecourt and quiet enough to use outside a house after dark. No money upfront; you settle up that day. Afterwards, a VAT invoice and the report from the engineer go to you for the insurer. It's worth checking your insurance as the van travels to you: misfuelling cover comes with many policies. ## About Blaina Blaina is a town situated in the county of Blaenau Gwent, Wales, with a lakeside setting and an elevation of 282 metres. Blaina lies near the communities of West Side, Cwmcelyn, and Coedcae, and is approximately 14 miles from Newport. Blaina has a population of around 5531 people, predominantly living in terraced housing. Blaina is located in a region of south Wales, about 131 miles from London. ## Blaina and Blaenau Gwent: AdBlue drains across the area Cwmcelyn and Coedcae are among the towns near Blaina, a town, that the same vans cover, throughout NP postcodes. Fastest of all: give a NP13 3 postcode to our van. The car does not need to shift. Wherever it sits — near St Peter's Church, in a lay-by heading to Pilgrims Park, at home — that's where it gets emptied. Assuming doesn't help behind Blaina Library, on a boundary, or anywhere awkward to pin down; ring and ask. ## Blaina drivers: the short version Pour no AdBlue till you have read the cap. Even so AdBlue in your diesel tank? Petrol in Diesel will empty it where it stands, wherever in Blaenau Gwent: switch it off and call 0333 366 0103.