--- title: AdBlue in a Diesel Tank Tremains? Read This canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/tremains-bridgend/ location: Tremains county: Bridgend latitude: 51.506210 longitude: -3.573410 service: AdBlue in a Diesel Tank updated: 2026-10-13 --- # Avoiding AdBlue in a Diesel Tank in Tremains: Why It Occurs AdBlue already in your diesel tank? In that case set this page aside for now, keep the ignition and engine off, and call 0333 366 0103. Caught before the engine runs, it is normally a drain and a thorough flush, done where your car is in Tremains. Here before the event? Then what follows explains how it comes about and what to stop it happening at all. ## Two fillers, two tanks: AdBlue in a diesel car No single fluid but two: that's how many newer diesels around Tremains and Whiterock carry, with diesel feeding the motor. AdBlue goes to your exhaust, where it is sprayed into the gas to fresh it, and it lives in a tank of its own. Each tank has its own filler. Some vehicles keep the AdBlue filler in your boot or under the bonnet; a lot of others have the two together behind one flap. Topping up the diesel side at the petrol pump happens constantly. Seldom topped up, AdBlue usually comes from a bottle, poured by someone who has to stop and think what cap it needs. It is in the gap that the slip happens. ## How does AdBlue in the diesel tank occur around Tremains? Seldom is it carelessness: usually three things coincide. On a drive off Tremains Road before work, or in the car park outside The Railway heading home: that's where the rushed top-up takes place. What is the reason for the rush? As AdBlue runs low your car tells you, and once it is gone, limp mode follows. Unfamiliar motors are second, as well. Rentals, new cars and company vehicles put their fillers in new places, and habit reaches for the cap it used on the old one. A spouted bottle finds no obstacle at a diesel filler any more than at an AdBlue one. And so the pour, once started, keeps on. The same few seconds decide it, in the middle of Tremains or out in Bridgend. ## Which filler is for AdBlue, and which for diesel? A couple of seconds is all these take — so check them before you tip anything, on a driveway in Heronston or a forecourt in Tremains. - Where it sits can mislead; the cap does not. AdBlue ones tend to be blue or bear the word "AdBlue" — diesel ones normally do not. - Look at the size: the smaller filler neck is, on many vehicles, the AdBlue one. - A label inside your fuel flap often says which fuel goes where, on many motors. Check for it. - The handbook says where it lives if the filler isn't next to your diesel cap: the boot, or under the bonnet. - The person who drove it last. On a hire or company car collected from somewhere like the car park outside Bridgend, ask before you leave, not when the light comes on. ## AdBlue top-ups that never reach your diesel tank For the day the light appears — wherever it is around Bridgend — a routine to follow. - Stop somewhere level, motor off, with time in hand — not rushing on the side of Llynfi Street. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds silly and it does the trick. - The two under a single flap? So make sure the cap on the diesel filler stays closed before lifting the bottle. - Using the bottle's own spout, pour slowly — and stop when it is full or the bottle is empty. - Only after that, start your car: close the cap, check again, and make sure the diesel cap was never opened. Spot at step two or three that it's already gone into the diesel side? Then stop right there. Don't go on to step five. ## Tremains: already put AdBlue in your diesel tank? Then the order of things is short. Don't start the motor. The fuel pump runs on many diesels as soon as the ignition is switched on — and so keep it off. Thinning it with extra diesel fails, since AdBlue sinks to the bottom rather than blending — and that's where the fuel is drawn from. Ask the attendants to help roll the car away from the pump if you're on a forecourt — the Applegreen, the Tesco or somewhere else. On your own drive around Tremains? So the car remains put. Where your motor has been run already, pull over somewhere safe then switch the car off. Tremains lies under 3 miles from the M4; there, use the next exit. Mileage counts — a short hop across Tremains is a smaller job than driving under 25 miles towards Cardiff — so say roughly how far it went. ## Tremains: what takes place when our engineers arrive The van comes to the car anywhere it has come to rest — your own driveway, beside Bridgend Gospel Hall, or outside the local primary school. What liquid went in, the quantity, and if it ran: we ask since the replies decide both work and price. That price is given over the phone, ahead of any van leaving. Draining your tank comes next, then a thorough flush of the fuel system. AdBlue crystallises and is corrosive to some of the metals in a fuel system, and so it does not wash out on its own — which is why the flush counts more with AdBlue than with petrol. The fuel filter is cleaned, or replaced where it needs to be; fresh diesel goes in; and the car is tested. Next our engineers start the engine and confirm it runs correctly before we go. If the engine has not run, most 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. You pay on the day, with nothing upfront, and get a VAT invoice and an engineer report for your insurer. While we travel, have a look at your policy; plenty carry cover for misfuelling. ## About Tremains Tremains is a suburban area in Bridgend, situated on the riverside at an elevation of 41 metres. Tremains is located near the towns of Bridgend and Newcastle, and is close to the community of Ystrad Fawr. Tremains has a population of approximately 5057 people, predominantly living in terraced housing. Tremains is within commuting distance of Cardiff, which is 17.2 miles away. ## AdBlue drains across Bridgend, Tremains included Tremains is a residential suburb, and the vans that cover it also work the towns around it, Newcastle and Ystrad Fawr among them, across the CF postcode area. Quote a postcode that starts CF31 1, and our van arrives fastest. No need to move the car. Wherever it stands — beside The Randall Memorial, in a layby heading to Newbridge Fields, on a drive — that's where it gets emptied. If you are near a border, or somewhere hard to describe like the back of Hope Baptist Church, ring and ask rather than assuming. ## In short, for Tremains drivers Tip nothing till you've read the cap. Still AdBlue in your diesel tank? Petrol in Diesel will empty it where it is, wherever around Bridgend: keep the car off then phone 0333 366 0103.