--- title: Tresillian: AdBlue in a Diesel Tank, What Next canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/tresillian-cornwall/ location: Tresillian county: Cornwall latitude: 50.276890 longitude: -4.997460 service: AdBlue in a Diesel Tank updated: 2026-10-19 --- # AdBlue in the Diesel Tank in Tresillian: What Now? Everything turns on one fact: whether the motor has started after the AdBlue was added — far more than anything else. If it has not, keep it that way, whether the vehicle is around Tresillian itself or out in Probus. Call 0333 366 0103 with the ignition and motor still off. Across Tresillian, such a case is typically emptied and cleaned where it stands. If it has run, stop as soon as it is safe and switch off. Stage one remains unchanged, even if the work grows. Below: the situations our technicians see, wherever in Cornwall. Pick yours. ## AdBlue in a diesel on a Tresillian forecourt Picture it: stood by the pump, gripping the bottle, you realise the filler you took off was not the right one. Maybe you're at the Texaco, perhaps at the Gulf, possibly somewhere else in Tresillian. The point: of all places to find out, this is the best. The AdBlue is inside your tank and nowhere else. Nothing has sucked it in. Clearing the petrol pump is no excuse to run it — so do not get back in. A few things: a shove into a bay with the attendants assisting, the receipt kept, and a ring to us from where you stand. Stuck by the petrol pump? Explosion-proof equipment keeps a live forecourt sensible, and so we can drain the car in place. ## AdBlue in your diesel tank on a Tresillian drive? On your dash, a reminder had shown for days. You bought a bottle, poured it in on the driveway, and only when you put the empty bottle in the recycling did you look a second time at the cap. Right off Polsue Way is no less likely from any other place. Meaning? Provided your car has not moved since, it is second to the pump case. As it is reluctant to blend, AdBlue drops low inside your tank and waits. A night parked changes none of that. Next: stop any early-morning drive by putting the keys indoors, then phone us. We drain the car on your drive, whether that's in Tresillian or out in Merther. The pumps are quiet enough to use outside a house after dark. ## Tresillian: set off with AdBlue in a diesel? You filled up, set off, and a mile or two later your motor began to run unevenly, smoke, lose power or light up the dashboard. Maybe driving to Truro, under 3 miles away, or simply along A390. The upshot: your system has pulled AdBlue through already. The injection pump and every injector get it too on a longer run, after the filter and lines have it. It goes deeper with every mile covered and every restart. Your move: stop somewhere safe, then turn the engine off. On the M5, over 50 miles from Tresillian, that means the next junction, not the services further on. Do not restart the vehicle to see if it has cleared; it will not have. Tell us know the distance driven as you call. ## AdBlue in the wrong tank of a hire, lease or company car A week back, the car was new to you. Your own car either does without AdBlue or keeps it somewhere different, and so no one warned you the AdBlue cap was just next to your diesel. Anyone, anywhere across Cornwall, could make it. In short: an extra stage on top of the situations above, and those turn on whether it's run. The owner frequently has to approve the work, under plenty of rental and company contracts. What to do: ring the hire firm or your fleet manager first, then us. That's quicker settled before we get there than after. Stranded by Holy Trinity or at Truro until the firm replies, your car stays switched off the whole time. ## Unsure about AdBlue in the diesel tank around Tresillian? At times, "I think so" is the most anyone can truthfully say. Too light, the bottle; a hint of ammonia near the filler; no clear memory of which cap. Sound familiar? A hurried stop by the gates of Tregolls Academy, or a call to a friend in St Michael Penkevil: either fits. Meaning? Drips outside the filler never reach your motor at all. A diesel tank with AdBlue inside is a different matter. If there is AdBlue in the tank, firing up the vehicle will pull it in, and it would not tell you which either. Next: assume it went in, and keep the engine off. Tell us what you saw on the phone. A clean tank checked counts as a better result than an already-run one emptied. ## What every AdBlue drain around Tresillian has in common Each situation gets the same start to the job. Three things come once we arrive — at a forecourt, a drive, a road by St Clement Church or the car park at The Wheel Inn: the fluid, the quantity, and whether the motor has been started. The price comes over the phone, before a van leaves, and the answers set the work. AdBlue crystallises and eats at certain metals used in fuel systems, so it won't rinse out on its own; that is why a full flush, after the drain, counts far more with AdBlue than with petrol. Next comes your filter — cleaned, or replaced where necessary — followed by fresh diesel, and a test of the vehicle. Where the motor hasn't been started, allow about half an hour on site, for most jobs. Finally, our engineers fire it up. We confirm it runs properly on clean diesel before we leave. The whole job is done where your car is, and if it's caught early, permanent damage is very unusual. For your insurer: the engineer's report and the VAT invoice. For you: payment on the day, nothing upfront. Plenty of insurance policies include misfuelling, so check yours as we head over. ## About Tresillian and where it is Tresillian is a small village in Cornwall, situated on the banks of the River Fal, near the city of Truro. Tresillian has a low elevation of around 7 metres above sea level and is surrounded by nearby places such as Merther, St Clement, and Tresawle. Tresillian is characterised by its predominantly detached housing stock, reflecting its rural setting. Tresillian is located approximately 228.6 miles west of London, in the South West region of England. ## AdBlue drains across Cornwall, Tresillian included Being a village, Tresillian shares its vans with the surrounding places — Tresawle, St Clement — right through TR postcodes. The location comes clearest from a postcode that starts TR2 4. Centre of Tresillian or a lay-by towards Tregassow Wood: either way it sits, your vehicle never needs to move at all for us. Our technicians drain it where it sits. Assuming won't help beside Probus Village Hall, close to a border or anywhere awkward to pin down; phone and check. ## Your situation, summed up If it has not started, phone then leave it that way. Already run: stop, switch off then ring. Either way, Petrol in Diesel takes it from there around Tresillian and anywhere around Cornwall on 0333 366 0103.