How It Happens and How to Avoid It: AdBlue in a Diesel Tank in Cwmynyscoy
Stop here for a moment if your diesel tank already holds AdBlue in it: ignition off, engine off, then ring 0333 366 0103. Normally, when the engine has not turned, it's drained and fully rinsed where the vehicle sits around Cwmynyscoy. If you are reading before it has happened, the rest of this page is about why it happens and how to make sure it doesn't.
Why does AdBlue in a diesel motor need its own filler?
No single fluid but two: that's how plenty of modern diesels near Cwmynyscoy and Pontymoel run, with diesel for the engine. The exhaust, not the engine, is where AdBlue ends up: sprayed into the fumes to clean them, from its own tank.
Every tank has a filler of its own. On a lot of vehicles the two sit side by side under the same flap; on others the AdBlue filler is in your boot or under the bonnet. Diesel gets filled on each filling station call-out, week in, week out. Rarely topped up, AdBlue usually goes in out of a bottle, tipped by a driver who has to stop and think what filler it needs. That gap is where the error lives.
How does AdBlue in the diesel tank take place in Cwmynyscoy?
Rarely is it carelessness: normally three things line up.
First, the warning. Low AdBlue triggers a message from the vehicle, and running dry leads to limp mode — hence a rushed top-up, maybe before work off Greys Road, or outside The Unicorn on the way home after work.
The old car's cap is where the hand goes — yet a hire car, a new motor or a company car keeps the fillers elsewhere. That's the second thing: a strange vehicle.
Nothing stops the tip after it has started, since a bottle with a spout goes into a diesel filler as readily as an AdBlue one. The bottle fits. It takes a few seconds, be it out in Cwm Fields or bang in the heart of Cwmynyscoy.
The AdBlue filler and your diesel filler: telling them apart
A couple of seconds is all the checks take — so check them before you pour anything, on a drive in Sowhill or a forecourt around Cwmynyscoy.
- Read the cap instead of going by where it sits: AdBlue caps are regularly blue or marked "AdBlue", and diesel ones usually aren't.
- Look at the size: the smaller neck is, on plenty of cars, the AdBlue one.
- Look inside the fuel flap: plenty of cars carry a label there saying which fuel goes where.
- The handbook says where it is if your filler isn't next to the diesel cap: your boot, or under the bonnet.
- The person who drove the vehicle last. On a hire or company car picked up from somewhere like the car park at Pontypool and New Inn, ask before you leave, not when the light comes on.
Topping up AdBlue without it reaching the diesel tank
Anywhere across Torfaen the light comes on, here is a routine for the day.
- Pull in on level, motor off, with time in hand — not rushing on the side of Cwmynyscoy Road.
- Say "AdBlue" out loud as you unscrew the cap, after finding the AdBlue filler and read it. Silly, yes, but it does the trick.
- If both sit under one flap, check the diesel cap is still closed before you lift the bottle — and leave it on.
- Tip slowly, using the bottle's own spout. Stop when it's full or when the bottle is empty.
- Before starting your car, shut the cap and look again that the diesel cap never opened off.
If at stage two or three you find you have already poured into your diesel side, stop there. Never go on to stage five.
Cwmynyscoy: already put AdBlue in your diesel tank?
Short order, then. Top of it: the motor stays unstarted. On plenty of diesels your ignition alone runs the fuel pump, and so don't switch the vehicle on. Thinning it with more diesel fails, since AdBlue sinks to the base instead of blending — and that is where your fuel is pulled from.
If you're at a forecourt, whether it's the the nearest petrol station or the Tesco, ask the staff to help push the vehicle away from the pump. Your own driveway in Cwmynyscoy is the place it should stay.
Stop as soon as it is safe then switch off, if the motor has already run. Cwmynyscoy lies under 10 miles from the M4; on it, use the first junction. Tell us about how far it went: a run towards Newport, under 10 miles away, is a bigger job than a short hop across Cwmynyscoy.
When we get there in Cwmynyscoy, what takes place?
Our technicians come to the vehicle wherever it has stopped, whether that's outside the local primary school, near Hanbury Arms Haunted Hotel & Museum or on your own driveway. Which fluid got in, the amount, and if it ran: our engineers ask since those replies decide the work and price. You hear that price on the phone, before anyone sets off.
Emptying that tank comes next, then a thorough flush of the fuel system. With AdBlue that matters more than with petrol: it crystallises and is corrosive to some of the metals in a fuel system, and so it doesn't wash out on its own. The fuel filter is flushed, or replaced where it needs to be; clean diesel goes in; and the vehicle is tested. We do not leave until it has been started and is running correctly.
Most jobs are done in about half an hour after our technicians arrive, provided your motor hasn't run — and the pumps our technicians use are fine on a busy forecourt yet quiet after dark beside a house. The insurer will ask for an engineer's report and your VAT invoice, and you get both at the end. Payment is on the day, with no money upfront. While we travel, take a look at your insurance documents; many carry cover for misfuelling.
About Cwmynyscoy and where it is
Cwmynyscoy is a suburban area in Torfaen, situated inland at an elevation of 161 metres, with semi-detached housing being the predominant type of accommodation. Cwmynyscoy lies approximately 7.4 miles north of Newport and is close to nearby places such as Cwm Fields and Upper Race. Cwmynyscoy has a population of around 1466 people and is part of the wider Torfaen community. Cwmynyscoy is located about 125.6 miles west of London.
Cwmynyscoy and Torfaen: AdBlue drains across the area
Upper Race and Trosnant are among the towns near Cwmynyscoy, a residential suburb, that the same vans cover, throughout NP postcodes. A postcode starting NP4 5 gets our van to you fastest.
Your car remains put. Draining takes place right there, whether a drive, a street by Pontymoile Undenominational Christian Mission, or a layby towards Pontypool Park. Ring and ask rather than assuming if you're near a boundary, or somewhere hard to describe, like the back of Canolfan Byw'n Egnïol Pont-y-pŵl.
The short version for Cwmynyscoy motorists
Tip no AdBlue until you've read the cap. If AdBlue has gone in your diesel tank all the same, leave it off then phone 0333 366 0103. Petrol in Diesel drains it where it stands, anywhere in Torfaen.