--- title: AdBlue in a Diesel Tank Pen-y-Pound: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/pen-y-pound-monmouthshire/ location: Pen-y-Pound county: Monmouthshire latitude: 51.826970 longitude: -3.020010 service: AdBlue in a Diesel Tank updated: 2026-10-24 --- # Preventing AdBlue in a Diesel Tank in Pen-y-Pound: Why It Happens Leave the motor and ignition off and ring 0333 366 0103 first — the rest can wait when AdBlue is already in the diesel tank. A drain plus a thorough flush, carried out right where the vehicle stands around Pen-y-Pound, is normally all it needs when caught before the engine runs. The rest of this page explains why it takes place and how to make sure it doesn't — useful if you are reading before it has happened. ## AdBlue in a diesel motor: two tanks, two fillers Not one liquid but two: that is how plenty of newer diesels near Pen-y-Pound and Mardy carry, with diesel feeding the motor. Kept in a tank of its own, AdBlue is sprayed into the exhaust stream to clean it. Each tank has one filler of its own. Many of motors have a single flap for both, while others put the AdBlue filler to your boot or under the bonnet. At the pump, your diesel side gets filled all the time. The AdBlue side is topped up far less often, usually from a bottle, and usually by someone who has to stop and think where it goes. Mistakes happen in the gap between the two. ## How does AdBlue in your diesel tank take place in Pen-y-Pound? Carelessness seldom explains it. What does is three things lining up together. The warning comes first. As AdBlue runs low your car tells you, and if it runs out completely, your vehicle drops into limp mode. So the top-up is done in a hurry: on a driveway off Park Crescent before work, or in the car park at Station Hotel on the way home. Then the vehicle is strange. A hire car, a new vehicle or a company car puts the fillers where your last one didn't, and the hand reaches for the cap it would have used on the old one. Lastly, the bottle fits: a diesel filler or AdBlue filler, it slides in as readily, and after the tip starts, nothing stops it. The same few seconds settle it, in the middle of Pen-y-Pound or out in Cantref. ## How to tell the AdBlue filler from the diesel one A couple of seconds is all the checks take — so check them before you pour anything, on a driveway in Llwyn-du or a forecourt in Pen-y-Pound. - Read the cap instead of going by position: AdBlue caps are often blue or marked "AdBlue", and diesel ones normally aren't. - Look at the size: the smaller filler neck is, on plenty of vehicles, the AdBlue one. - Lift the flap and look for a label — plenty of motors show what goes in each inlet just there. - Can't see it next to your diesel filler? In that case check below the bonnet or in your boot — the owner's manual will say where. - Whoever had it before will know. Ask as you pick up a hire car or fleet car — at Abergavenny's car park, say — not once the warning comes on. ## Topping up AdBlue without it reaching your diesel tank On the day the warning comes on — wherever it is in Monmouthshire — a routine to use. - Park then switch off. Not on a slope, not with your engine running, and not in a rush on the side of Penyfal Road. - Silly as it sounds, speaking "AdBlue" aloud as you unscrew the cap works — once you have located the filler and read the cap. - The two behind a single flap? So make sure the lid on your diesel side is still shut before raising 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 vehicle: close the cap, check once more, and make sure the diesel cap was never opened. Spot at stage two or three that it's already gone into your diesel side? Then stop right there. Never go on to stage five. ## Already put AdBlue in the diesel tank in Pen-y-Pound? Short list, then. Top of it: the engine remains unstarted. The fuel pump runs on many diesels as soon as the ignition is switched on — so leave it off. Thinning it with more diesel won't work, because AdBlue sinks to the bottom rather than mixing — and that is where your fuel is sucked from. The staff at Esso, BP or any forecourt will usually help to push the vehicle away if asked. Your own driveway in Pen-y-Pound is where it stays. Already started? Stop once it is safe, then turn off. Pen-y-Pound lies under 25 miles from the M4; there, take the first junction. Mileage matters — a quick hop across Pen-y-Pound is a smaller job than heading under 25 miles towards Newport — so tell us about how far it went. ## Pen-y-Pound: what occurs when our technicians turn up Our van comes to the car anywhere it stopped — your own drive, near The Melville Centre, or outside the local primary school. Both the work and our price depend on three replies — what fluid, what amount, and if it has run — so we ask. The price comes over the phone, ahead of any van leaving. Draining that tank comes next, followed by a thorough flush of the system. Not like petrol, AdBlue leaves crystals and attacks certain fuel-system metals, and none of that clears away unaided. Hence it counts more. The filter cleaned or, if needed, replaced; fresh diesel in; then a check of your car. Then our technicians start the engine and confirm it runs properly before we leave. Most jobs are finished in about half an hour once our technicians arrive, provided the motor has not run — and the pumps our engineers use are fine on a live forecourt yet quiet after dark outside a house. You pay on the day, with nothing upfront, and get a VAT invoice and an engineer report for your insurer. Plenty of insurance policies include misfuelling cover, so it's worth checking yours whilst we're on the way. ## About Pen-y-Pound, for a moment Pen-y-Pound is a suburban area situated on the banks of a river in Monmouthshire, with an elevation of around 68 metres. Pen-y-Pound lies near several notable towns, including Abergavenny and Newport, and is characterized by its predominantly semi-detached housing stock. Pen-y-Pound is located in a region of south Wales that has been settled for centuries, with nearby places like Cantref and Grofield adding to the local heritage. ## Pen-y-Pound and Monmouthshire: AdBlue drains across the area Pen-y-Pound is a residential suburb, and the vans that cover it also work the towns around it, Abergavenny and Grofield among them, across the NP postcode area. The van gets to you fastest with a postcode starting NP7 5. No need to shift your car. Anywhere it stands — near Our Lady And St Michael's Catholic Church, on a lay-by en route to Bailey Park, at home — that is where it gets drained. Guessing doesn't help behind Abergavenny Presbyterian Church, close to a border, or anywhere awkward to describe; ring and ask. ## Pen-y-Pound people: the short version Pour nothing until you have read the cap. AdBlue in your diesel tank after all? Keep the vehicle off and call 0333 366 0103; Petrol in Diesel drains it on the spot, throughout Monmouthshire.