--- title: What Now? AdBlue in a Diesel Tank Polwheveral canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/polwheveral-cornwall/ location: Polwheveral county: Cornwall latitude: 50.113280 longitude: -5.169430 service: AdBlue in a Diesel Tank updated: 2026-10-03 --- # AdBlue in the Diesel Tank in Polwheveral, and What to Do Next One fact matters above all once AdBlue is in a diesel tank, and that is if your motor has run since. Out in Comfort or right around Polwheveral, an unrun engine must stay that way. Leave your motor and your ignition off and phone 0333 366 0103; it's normally a drain and a thorough flush, done where the car is in Polwheveral. When your motor has been run, stop safely first, then switch the car off. The job is bigger, yet the first stage is the same. Further down: the cases we meet, wherever around Cornwall. Pick the one that fits. ## At the pump around Polwheveral: AdBlue in a diesel You are 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. Maybe you are at the Gulf, possibly at the Asda, possibly somewhere else around Polwheveral. Meaning? Finding out here is as good as it can be. Still in that tank, with nothing drawn through: that's where the AdBlue sits. Do this: keep out of the driver's seat, even if the pump wants freeing. Ring us from the forecourt after your vehicle sits in a space — the attendants will lend a hand to roll it — then save the receipt. Stuck by the pump? Our explosion-proof kit keeps a live forecourt sensible, so it can be drained in place. ## At home around Polwheveral with AdBlue in your diesel tank Days had gone by with the dash light on. You bought a bottle, poured it in on the driveway, and only when you put the empty bottle in the recycling did you look again at the cap. Homes just off Penwartha Close get caught out as much as anywhere else. What it means: if you have not driven since, this is nearly as good as the forecourt. Diesel and AdBlue stay separate: the AdBlue drops to the base of your tank and remains put, no matter how long it waits. What to do: leave the keys inside the house so no one moves the car in the morning. Then call. Our engineers drain it on your drive, whether that is in Polwheveral or out in Nancenoy. Late-night empties outside a house are fine: the pumps are low-noise. ## Polwheveral: drove off with AdBlue in a diesel? You filled up, set off, and a mile or two later the engine began to run roughly, smoke, lose power or light up the dashboard. Perhaps it was on Bowling Green Road, maybe on the way out towards Truro, under 15 miles away. The point: the system has pulled AdBlue in by now. Distance sets how deep it gets: filter and lines first, then the high-pressure pump and each injector. Each mile and each restart takes it further. Your move: pull up anywhere sensible, then switch your motor off. Service stations further along can wait: from the M5, over 50 miles out of Polwheveral, use the next junction. Don't restart it to see if it has cleared; it will not have. Roughly how far had it go? Say so as you call. ## AdBlue in the wrong tank of a hire, lease or company car You've had the car hardly a week. On your own vehicle, AdBlue is absent or somewhere else. On this one, its inlet is right by your diesel inlet — news to you. Anywhere you happen to be across Cornwall, every motorist can slip up. Put simply: one extra step on top of the situations above, and those depend on if it's run. Work on the vehicle often needs the owner's approval under hire or company terms. Next: phone the rental company or the fleet manager first, then us — sorting it before our arrival is quicker. If you're stranded in the car park outside Penmere, or by Settlement, whilst you wait for an answer, leave your car off. ## Not sure it was AdBlue in the diesel tank, Polwheveral? Now and then, "I think so" is the most you can truthfully say. A slight ammonia smell hangs around the filler, the bottle seems too light, and which cap came off is a blur. Perhaps it happened in a hurry at the school gates at Constantine Primary School, or on a friend's drive in Ponjeravah. The upshot: the engine is not hurt by a little AdBlue spilled around the filler. The diesel tank with AdBlue in it is a different matter. You cannot tell which by turning the ignition, and doing so will pull in any AdBlue that is in that tank. What to do: treat it as if it was put in. Do not start the vehicle. Ring us and describe what you saw; we would rather check a tank that turns out free of AdBlue than drain one that has already been run. ## The common ground in every Polwheveral AdBlue drain Whatever the case, a single start is used. Our engineers come to your car, whether it's on a forecourt, a drive, the car park outside Trengilly Wartha Inn or a side street near Constantine Museum and Archive, and ask three things: what was put in, about how much, and if your engine has run. Over the phone, ahead of dispatch, you are told our quote, and those replies decide the job too. A thorough flush comes after this drain. With petrol it is routine; with AdBlue it's crucial, because deposits build up and certain metals corrode, and neither washes away unaided. Clean diesel is put in once your filter has been cleaned or replaced, and the car is finally checked. Where the motor has not been started, allow roughly half an hour once we arrive, for most jobs. Starting it comes at the end. Our test that it runs smoothly on clean diesel comes before our technicians leave. Our engineers do the entire job where your car is, and permanent damage is very unusual when it has been noticed quickly. Paying is on the day, never upfront. For the insurer, there is a VAT invoice plus a report from the engineer. Dig out your insurance before we arrive: misfuelling cover is included in many policies. ## About Polwheveral, briefly Polwheveral is a coastal locality in Cornwall, situated near the towns of Nancenoy and Constantine, with Polpenwith also nearby. Polwheveral sits at an elevation of around 60 metres, overlooking the surrounding countryside and coastline. Polwheveral has a population of approximately 548 people, living in predominantly detached housing. Polwheveral is located about 11.6 miles from Truro, the nearest city, and around 240.2 miles from London. ## AdBlue drains in Polwheveral, and across Cornwall too Over TR postcodes, the teams covering Polwheveral — a coastal area — reach nearby places too, Constantine and Polpenwith among them. A postcode starting TR11 5 is the quickest way to tell us where you are. Stopped heading to Scott's Wood, or right in the heart of Polwheveral, the vehicle remains where it is — there's no need to shift it anywhere. The drain happens on the spot. Ring and check instead of guessing if you're by St Constantine, on a border, or anywhere awkward to pin down. ## The one-line version Where it has not run, ring then leave it off. Already run: stop, switch off and call. Either way, Petrol in Diesel takes it from there in Polwheveral and anywhere around Cornwall on 0333 366 0103.