--- title: AdBlue in a Diesel Tank Trewellard: What Now canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/trewellard-cornwall/ location: Trewellard county: Cornwall latitude: 50.145850 longitude: -5.673530 service: AdBlue in a Diesel Tank updated: 2026-10-17 --- # Trewellard: AdBlue in the Diesel Tank? Find Your Situation What to do about AdBlue in a diesel tank comes down to one thing more than any other: whether your engine has run since it went in. Anywhere your vehicle stands — Pendeen, Trewellard — don't start an engine that has not been started yet. Switch nothing on, phone 0333 366 0103, then count on a proper flush after a drain, done just where the car stands in Trewellard. Stop the moment it is safe and switch off, if it has been run. It's a bigger job, yet step one does not change. Find the situation below that matches yours, wherever around Cornwall it happened. ## On a Trewellard forecourt with AdBlue in a diesel You're at the pump, the nozzle or the bottle still in your hand, and you have just noticed the cap you opened was the wrong one. Be it Trewellard Garage, another forecourt nearby or somewhere else in Trewellard, the case is the same. The point: of all places to find out, the forecourt is the best. The AdBlue is inside your tank and nowhere else. Nothing has drawn it in. Do this: stay out of the car, even if the pump wants clearing. A few jobs: a push into a space with the attendants helping, the receipt kept, and a call to us from where you stand. Our equipment is explosion-proof and fine on a live forecourt, so a car that cannot be pushed away gets drained where it is at the pump. ## At home in Trewellard with AdBlue in your diesel tank Several days had gone by with the warning light on. You bought a bottle, poured it in on the drive, and only when you put the empty bottle in the recycling did you look once more at the cap. It takes place on driveways just off B3306 as often as anywhere. What it means: if you haven't driven since, this is nearly as good as the forecourt. AdBlue doesn't mix with diesel; it sinks to the bottom of your tank and waits there. Overnight doesn't change that. Keep your keys indoors tonight — or a person might drive it off at breakfast — and call us. Our technicians drain the car on your drive, whether that is in Trewellard or out in Lower Trewellard. Night-time clears beside a house are no problem: the pumps are low-noise. ## Trewellard: set off with AdBlue in a diesel? You filled up, set off, and a mile or two later your motor began to run roughly, smoke, lose power or light up the dashboard. It might have been driving for Truro, under 50 miles away, or simply along Levant Road. In short: the AdBlue has been pulled into your fuel system. Mileage sets how deep it gets: filter and lines first, then the injection pump and every injector. Each mile and each restart takes it further. Pull in safely — that's the first step — then switch everything off. Trewellard sits over 50 miles from the M5; there, pull off at the next junction rather than pressing on to the services. It won't have cleared, and so there's no sense starting it again to find out. Phone, saying how far your vehicle went. ## AdBlue in the wrong tank: hire, lease and company cars It's a motor you have had for a week. Unknown to you, the AdBlue and diesel inlets are next to each other here — not like your own vehicle, which has none or keeps it in another spot. Anywhere you are across Cornwall, any motorist could be caught. In short: one extra stage on top of the cases above, and those depend on if it's run. Many hire and company agreements require the owner's sign-off before work. Your move: rental firm or fleet manager first, us next, since settling it beforehand saves time. Stuck near Carnyorth Education Centre or at Penzance until someone replies, the car remains turned off the whole time. ## Not sure it was AdBlue in the diesel tank, Trewellard? "I think so" is sometimes as honest as it gets. What cap came off, you cannot say; but the bottle weighs lighter than expected, and a whiff of ammonia lingers by your filler. The gates of Pendeen School in a rush, perhaps, or a friend's driveway over in Lower Boscaswell. Meaning? Spills outside the inlet don't touch your motor at all. A diesel tank with AdBlue in it is another matter. If there is AdBlue in the tank, starting the vehicle would suck it in, and it wouldn't tell you which either. What to do: treat it as if it was put in. Don't start the car. Tell us what you saw on your phone. A clear tank looked at counts as a happier result than a run one drained. ## What each AdBlue drain around Trewellard has in common The job opens the same way, whatever your situation. Three questions are asked once our engineers arrive — at a forecourt, a drive, a road by Higher Bal Engine and Boiler House or the car park at Trewellard Arms: the fluid, the amount, and whether it has run. On the phone, before dispatch, you hear our price, and those answers decide the work too. A thorough flush comes after this drain. With petrol it's standard; with AdBlue it's essential, since deposits build up and some metals are attacked, and none of it rinses away unaided. Next is the filter — cleaned, or swapped where needed — followed by fresh diesel, and a test of the vehicle. Not started? Then roughly half an hour once we are there covers most jobs. We start the engine at the end. Our test that it runs correctly on new diesel comes before our technicians head off. Our technicians do the entire job where your car is, and lasting damage is very unusual if it has been spotted quickly. You pay on the day, with nothing upfront, and get a VAT invoice and an engineer report for your insurer. Plenty of policies include misfuelling, and so look at yours while the van travels. ## About Trewellard Trewellard is a small suburban area in Cornwall, situated on the coast with nearby villages including Lower Trewellard and Carnyorth. Trewellard sits at an elevation of 136 metres, overlooking the surrounding coastline. Trewellard is characterized by its terraced housing and is located approximately 28 miles from Truro, the nearest city. Trewellard has a population of around 515 people, making it a relatively small community. ## Trewellard and Cornwall: AdBlue drains across the area Trewellard is a residential suburb, and the same teams that cover it work the places near it too, Carnyorth and Higher Boscaswell among them, across the TR postcode area. A postcode starting TR19 7 is the quickest way to tell us where you are. Whether the vehicle is on a lay-by on the way to Trewellard Common or in a car park in the middle of Trewellard, it does not need to move. The drain is done right there. Awkward to pin down? By Geevor Tin Mine or a border? Checking is better than assuming, so ring. ## In one line: your situation Not run yet: keep the vehicle off then ring. Already run: stop, switch off and call. Either way, Petrol in Diesel takes it from there in Trewellard and anywhere in Cornwall on 0333 366 0103.