--- title: Explained: AdBlue in a Diesel Tank Great Honeyborough canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/great-honeyborough-pembrokeshire/ location: Great Honeyborough county: Pembrokeshire latitude: 51.714400 longitude: -4.952680 service: AdBlue in a Diesel Tank updated: 2026-10-24 --- # AdBlue in a Diesel Tank in Great Honeyborough: Why It Happens and How to Stop It If AdBlue is already in your diesel tank, stop reading for a moment: leave your engine and the ignition off then ring 0333 366 0103. In Great Honeyborough, finding it before your motor runs normally leaves draining and a thorough flush where it stands. If you are reading before it has happened, the remainder of this page is about why it occurs and how to make sure it doesn't. ## Why does AdBlue in a diesel vehicle need its own filler? Many modern diesels around Church Lake, as well as Great Honeyborough, carry on two fluids; the engine gets only the diesel. AdBlue goes to your exhaust, where it is sprayed into the gas to fresh it, and it lives in a tank of its own. There is a filler for each tank. Other cars keep the AdBlue filler in the boot or under the bonnet; a lot more place both together under one flap. Topping up the diesel side at the petrol pump goes on constantly. Far less regularly, the AdBlue side is topped up — mostly from a bottle, by a person working out where it goes. The mistake lives in that gap. ## How does AdBlue in your diesel tank take place in Great Honeyborough? Rarely is it carelessness: normally three things coincide. The warning comes first. As AdBlue runs low the car tells you, and if it runs out altogether, the vehicle drops into limp mode. So the top-up is done in a hurry: on a drive off Fleming Way before work, or in the car park at the pub in the village on the way home. Unfamiliar cars are second, as well. Hire cars, new cars and company vehicles put their fillers differently, and habit goes for the cap used on the old one. Third, the bottle goes in: a diesel filler or AdBlue filler, it slides in as easily, and after the tip begins, nothing halts it. The same few seconds settle it, in the middle of Great Honeyborough or out in Neyland Vale. ## Telling the AdBlue filler from the diesel filler Before you pour anything, whether on a drive in Mascle Bridge or a forecourt around Great Honeyborough, check these. They take a few seconds. - The cap. The AdBlue cap is often blue, or marked "AdBlue". Your diesel cap usually is not. Read it instead of going by where it sits. - Many vehicles give AdBlue the smaller neck of the two. - A label inside the fuel flap often shows which fuel goes where, on many motors. Look for it. - In the boot or under the bonnet: that is where the filler is if it is not by your diesel cap, and the handbook tells you which. - Ask the person who drove it last — before you leave, not when the light comes on — if you pick up a hire or company car from somewhere like the car park at Pembroke Dock. ## Keeping AdBlue out of the diesel tank when you top up The day the light comes on, anywhere around Pembrokeshire, follow this routine. - Park and switch off. Not on a slope, not with the engine running, and not in a rush on the side of Water Street. - Silly as it sounds, saying "AdBlue" aloud as you unscrew the cap works — after you've found your filler and read the cap. - If both sit under one flap, check your diesel cap is still closed before you lift the bottle — and leave the car on. - Slowly is best, through the bottle's own spout, until it is full or the bottle is empty. - Only then, start the car: close the cap, check a second time, and make sure your diesel cap was never opened. Discover at the second or third step that the bottle went into the wrong filler? That's where you stop. Leave out stage five entirely. ## Already put AdBlue in the diesel tank in Great Honeyborough? Then the order of things is short. Don't start your motor. Keep the ignition off too, since on plenty of diesels it by itself starts your pump. Filling up with diesel will not dilute it: rather than mixing, AdBlue sinks to the bottom of the tank, just where the fuel is taken from. The attendants at Texaco, Asda or another forecourt will normally help to push your car away when asked. If you're on your own drive around Great Honeyborough, leave the vehicle where it is. Already started? Stop once it's sensible, then turn off. Leave the M4 — under 50 miles out of Great Honeyborough — at the first junction. Tell us roughly how far it went: a run towards St Davids, under 25 miles away, is a bigger job than a short hop across Great Honeyborough. ## Our arrival in Great Honeyborough, and what takes place next The van comes to the car wherever it has come to rest — your own driveway, near Wesley Methodist Church, or outside the local primary school. Our technicians ask what went in, roughly how much, and whether it's run, because those replies settle the work and the price. During the call itself, you are told the price — before dispatch. Draining that tank comes next, followed by a thorough flush of the system. With AdBlue that counts 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. Testing is at the end: before that, fresh diesel is added, and the filter is flushed or changed as needed. We don't leave until it has been fired up and is running correctly. If your motor has not run, most jobs take about half an hour once we are there, using pumps that are safe on a busy forecourt and quiet enough to use outside a house after dark. 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 is worth checking yours while we are on the way. ## About Great Honeyborough and where it is Great Honeyborough is a suburban area in Pembrokeshire, situated on the coast of Wales at an elevation of 39 metres. Great Honeyborough lies near the settlements of Neyland Vale and Neyland, and is within reach of the nearby city of St Davids. Great Honeyborough has a population of around 2456 people, predominantly living in semi-detached housing. ## AdBlue drains across Pembrokeshire, Great Honeyborough included Neyland and Glenowen are among the places near Great Honeyborough, a residential suburb, that the same vans cover, throughout SA postcodes. Fastest of all: quote a SA73 1 postcode to the van. The vehicle remains put. Draining happens on the spot, whether a drive, a road by Neyland Library, or a layby towards Charlton Place Park. Ring and ask rather than guessing if you're close to a boundary, or somewhere hard to describe, like the back of Isambard Kingdom Brunell. ## In short, for Great Honeyborough drivers Before you pour, read the cap. Even so AdBlue in your diesel tank? Petrol in Diesel can empty it wherever it stands, anywhere around Pembrokeshire: switch it off and ring 0333 366 0103.