--- title: AdBlue in a Diesel Tank Goodwick: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/goodwick-pembrokeshire/ location: Goodwick county: Pembrokeshire latitude: 52.004720 longitude: -4.995960 service: AdBlue in a Diesel Tank updated: 2026-10-23 --- # Preventing AdBlue in a Diesel Tank in Goodwick: Why It Occurs Keep the motor and ignition off and phone 0333 366 0103 now — the rest can wait if AdBlue is already in the diesel tank. In Goodwick, catching it before the engine turns normally means a drain and a full flush where it stands. Reading in advance? Then the rest explains why it happens and how to prevent it happening at all. ## Two fillers, two tanks: AdBlue in a diesel vehicle Plenty of newer diesels on the roads about Goodwick and Cilau carry two liquids, not one. Diesel goes to the engine. AdBlue's own tank keeps it, and from there it goes to your exhaust, where spraying treats the gas. Each tank has its own filler. Some cars put the AdBlue filler in the boot or under the bonnet; a lot of others have the two together behind one flap. The diesel side is filled at the pump all the time. A driver who has to stop and think where it goes normally fills the AdBlue side, from a bottle, and much less commonly. Mistakes happen in the gap between the two. ## Goodwick: how AdBlue in your diesel tank happens Three things tend to come together, and carelessness is rarely one of them. Hurry comes from the warning. The car warns you as AdBlue runs low, and an empty tank sends the vehicle into limp mode — so the top-up gets done in a rush, before work on a drive off Main Street, or on the way home in the car park at Hope and Anchor. Then, your hand reaches for the cap it knew on the old motor — because a hire car, a new motor or a company car places the fillers somewhere your last one didn't. Lastly, the spout goes in: a diesel filler or AdBlue one, it goes in just as easily, and once the pour begins, no part halts it. Harbour Village or the heart of Goodwick: it is the same few seconds in both. ## The AdBlue filler and the diesel filler: telling them apart Whether a Goodwick forecourt or a driveway over in Penyraber, take a few seconds on these before anything is poured in. - The cap. The AdBlue cap is frequently blue, or marked "AdBlue". Your diesel cap usually isn't. Read it rather than going by where it sits. - On plenty of motors, the size gives it away: AdBlue has the smaller filler neck. - The flap. Look inside the fuel flap for a label. Plenty of motors say there which fuel goes where. - Cannot find it beside the diesel inlet? Then check below the bonnet or in your boot — the handbook will say 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 Fishguard & Goodwick. ## How to top up without AdBlue in your diesel tank Wherever across Pembrokeshire the light comes on, this is a routine for the day. - Switch off after you park — level ground, engine stopped, and never in a rush beside Goodwick Hill on the verge. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds silly and it works. - If both sit under one flap, check your 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 is full or when the bottle is empty. - Before starting the vehicle, close the cap and look a second time that your diesel cap never opened off. Spot at step two or three that it's already gone into the diesel side? Then stop just there. Don't carry on to step five. ## Already put AdBlue in your diesel tank in Goodwick? Do not start the engine: that's how the short order of things starts. On plenty of diesels your ignition alone runs the fuel pump, and so do not switch the vehicle on. Filling up with diesel won't weaken it: instead, AdBlue sinks to the bottom of your tank, right where fuel is taken from. Ask the staff to help roll the car clear of the petrol pump if you are at a forecourt — the Esso, the another forecourt nearby or anywhere else. Your own drive around Goodwick is where it stays. Already run? Stop once it is sensible, then turn off. On the M4, under 50 miles from Goodwick, that means the next exit. Mileage counts — a short hop across Goodwick makes a smaller job than driving under 15 miles to St Davids — so say roughly how far it went. ## When we turn up in Goodwick, what occurs? Outside the local primary school, near Phoenix Community Centre or on your own drive: wherever the car has stopped, our engineers come to it. Which fluid was put in, the quantity, and whether it ran: our engineers ask since the answers set both work and price. Nobody sets off until you have had our price by phone. Then that tank is emptied and your system cleaned thoroughly. Unlike petrol, AdBlue forms crystals and eats at some fuel-system metals, and none of that washes away unaided. That is why it matters more. The fuel filter is cleaned, or replaced where it needs to be; clean diesel goes in; and the vehicle is tested. We don't go until it has been started and is running properly. Using pumps fine on a busy forecourt and quiet enough for use outside a house at night, most jobs where your engine hasn't run need about half an hour after we arrive. The insurer will ask for an engineer's report and your VAT invoice, and you get both once the job is done. Payment comes on the day, with no deposit. It's worth looking at your insurance as the van travels to you: misfuelling cover comes with many policies. ## About Goodwick, briefly Goodwick is a coastal town in Pembrokeshire, situated on the north side of the haven, with a mix of terraced housing and more modern developments. Goodwick has a population of around 2920 people and is located near the villages of Harbour Village, Stop-and-Call, and Dyffryn. Goodwick sits at an elevation of 24 metres, looking out over the sea. Goodwick is close to the smallest city in the UK, St Davids, which is 14 miles away. ## Goodwick and Pembrokeshire: AdBlue drains across the area Goodwick is a coastal town, and the vans that cover it also work the places around it, Stop-and-Call and Dyffryn among them, across the SA postcode area. A postcode starting SA64 0 gets the van to you fastest. No need to move the car. Draining takes place right there, be it a driveway, a street near Ocean Lab, or a lay-by towards The Rec. Guessing doesn't help behind Holy Name Church, on a boundary, or anywhere hard to pin down; phone and ask. ## In short, for Goodwick people Before you pour, read the cap. Even so AdBlue in the diesel tank? Petrol in Diesel will drain it wherever it is, anywhere around Pembrokeshire: keep it off then ring 0333 366 0103.