AdBlue in a Diesel Tank in Cwmparc: How It Happens and How to Stop It
Pause reading for a moment when your diesel tank already holds AdBlue in it: ignition off, motor off, then ring 0333 366 0103. Caught before your motor runs, it is generally a drain and a thorough flush, done where the vehicle is around Cwmparc. Reading in advance? Then the rest covers how it happens and how to stop it happening at all.
AdBlue in a diesel motor: two tanks, two fillers
Many modern diesels in Pen-yr-englyn, like those in Cwmparc, run on two liquids; the motor gets only the diesel. AdBlue goes to the exhaust, where it is sprayed into the gas to fresh it, and it lives in a tank of its own.
Every tank comes with a filler of its own. On a lot of motors the two sit side by side under the same flap; on others the AdBlue filler is in the boot or under the bonnet. Topping up the diesel side at the pump happens constantly. The AdBlue side is filled far less commonly, usually from a bottle, and usually by someone who has to stop and think where it goes. The mistake lives in that gap.
How AdBlue in your diesel tank takes place in Cwmparc
It is seldom carelessness. Three things tend to line up.
Haste comes from the warning. The vehicle tells you as AdBlue runs low, and an empty tank puts it into limp mode — so the top-up happens quickly, before work on a drive off Church Street, or on the way home in the car park outside Parc Hotel.
Then the vehicle is unfamiliar. A hire car, a new motor or a company car puts the fillers where your last one did not, and the hand hits for the cap it would have 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 easily as an AdBlue one. The bottle fits. Treorchy or the middle of Cwmparc: it takes the same few seconds either way.
How to tell the AdBlue filler from the diesel one
Before you pour anything, whether on a driveway in Ton Pentre or a forecourt in Cwmparc, check these. They take a couple of seconds.
- The cap. The AdBlue cap is often blue, or marked "AdBlue". The diesel cap usually isn't. Read it rather than going by position.
- Plenty of cars give AdBlue the smaller filler of the two.
- Check inside your fuel flap: plenty of vehicles have a label there saying which fuel goes where.
- In your boot or under the bonnet: that is where the filler is if it's not by your diesel cap, and the handbook says which.
- Picking up a hire or company car, perhaps at the car park at Treorchy? Check with whoever drove the car last before you set off, rather than once the light comes on.
Topping up AdBlue without it reaching the diesel tank
On the day the light appears — wherever it is across Rhondda Cynon Taf — a simple routine to use.
- Park and switch off. Not on a slope, not with the engine running, and not in a rush on the side of Park Road.
- Daft as it sounds, saying "AdBlue" aloud while you unscrew the cap works — once you've located your filler and read it.
- The two under a single flap? Then make sure the lid on your diesel filler is still closed ahead of raising the bottle.
- Stop once that tank fills or the bottle runs dry; before that, tip gently through its own spout.
- Before you start your car, shut the cap and look a second time that the diesel cap was never opened off.
Find at the second or third stage that AdBlue went in the wrong tank? That is where you stop. Never carry on to stage five.
Put AdBlue in the diesel tank in Cwmparc already?
Brief list, then. Top of that: your engine remains unstarted. The fuel pump runs on many diesels as soon as your ignition is switched on — so leave it off. AdBlue does not mix with diesel — it sinks to the bottom of your tank, where the fuel is pulled from — so do not top up with diesel to thin it.
Ask the attendants to help roll your car away from the pump if you are on a forecourt — the Texaco, the Murco or anywhere else. On your own drive around Cwmparc? Then your car remains put.
When the engine has been run already, pull over somewhere safe and turn it off. Cwmparc sits under 10 miles from the M4; on it, use the first junction. Roughly how far did it go? Crossing Cwmparc is smaller a job than a trip of under 25 miles to Swansea, so say.
Our arrival in Cwmparc, and what takes place next
We come to the car wherever it has stopped, whether that's outside the local primary school, near St George's Church or on your own driveway. Which liquid went in, the amount, and whether it ran: our engineers ask because those replies decide the work and quote. That price is given on the call, ahead of any van leaving.
After that: a drain, then a full flush of the entire system. Much more than with petrol, it matters with AdBlue: the crystals build up, certain metals are attacked, and none of it washes away on its own, no matter how long it sits. A test is at the end: before that, fresh diesel is added, and your filter is flushed or replaced as needed. Before we go, we fire it up and check that it is running properly.
Most jobs are done in roughly half an hour once our technicians arrive, as long as the engine hasn't run — and the pumps our technicians use are fine on a busy forecourt yet quiet at night beside a house. Payment happens on the day, not upfront, and you receive the paperwork an insurer asks for: an engineer's report and a VAT invoice. Wrong-fuel cover is included in many insurance policies — and so make use of the wait to check yours.
About Cwmparc and where it is
Cwmparc is a suburban area situated in the Rhondda Valley in south Wales, with the River Rhondda flowing nearby. Cwmparc sits at an elevation of 199 metres, surrounded by the communities of Treorchy, Ynyswen, and Pentre. Cwmparc is characterized by its predominantly terraced housing stock, reflecting the area's historical development as a residential community. Cwmparc is located approximately 18 miles north of Swansea, making it a commuter base for the city.
AdBlue drains around Cwmparc, and Rhondda Cynon Taf beyond
Over CF postcodes, our vans that cover Cwmparc — a residential suburb — work the nearby places too, Pentre and Ynyswen included. Fastest of all: give a CF42 6 postcode to the van.
The car stays where it is. The drain happens on the spot, whether a driveway, a road near Treorchy Library, or a lay-by on the way to Ystradfechan Park. Guessing doesn't help behind Bethlehem Eglwys Presbyteraidd Cymru, close to a border, or somewhere hard to describe; phone and ask.
For Cwmparc drivers, the short version
Read the cap before you pour. Petrol in Diesel drains it where it stands, anywhere across Rhondda Cynon Taf, if AdBlue has gone in the diesel tank anyway — so leave the car off then phone 0333 366 0103.