--- title: Ruan Minor: AdBlue in a Diesel Tank? Don't Start canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/ruan-minor-cornwall/ location: Ruan Minor county: Cornwall latitude: 49.993430 longitude: -5.182140 service: AdBlue in a Diesel Tank updated: 2026-10-26 --- # AdBlue in the Diesel Tank in Ruan Minor? Keep It Switched Off AdBlue in your diesel tank? Then leave your engine off — and your ignition too. AdBlue is urea dissolved in water. It does not burn, it doesn't mix with diesel, and the harm it does begins when the system pulls it in. If your engine has not run yet, AdBlue in a diesel tank is usually emptied and carefully flushed where the vehicle sits around Ruan Minor. Ring 0333 366 0103 before you do anything else. ## Those opening minutes: AdBlue in your diesel tank in Ruan Minor To do: - Keys out — that way no one can switch anything on. - Put your hazards on if you are anywhere near moving traffic. - Hold on to your receipt or the empty bottle, so you can tell us what was put in and about how much. - The van locates you fastest with a postcode starting TR12 7, or just the name of a street nearby, so phone from the car. Don't do these: - No starting your engine — not briefly, not to shift your vehicle. - Plenty of diesels power their pump the instant the ignition comes on, so keep the vehicle off. - Don't top up with diesel to thin it. AdBlue does not mix in diesel; it separates out. - Even a short stretch up Poltesco Lane is too far to drive the car. - By the road, do not try draining it on your own. On a forecourt around Ruan Minor, whether it's the Kynance Garage or another one, ask the attendants to help you roll the vehicle clear of the pump. At your own drive, don't touch it at all. ## What AdBlue does in a diesel tank Not your engine but your exhaust is where AdBlue belongs. From a dedicated tank it goes straight to your exhaust, cleaning what the motor lets out. A fuel pump isn't designed to take it, and AdBlue was never intended to go through one. It doesn't blend. Once it's poured into the tank, AdBlue behaves nothing like fuel. It is heavier than diesel, and so it sinks and collects at the bottom of that tank, which is where the pickup draws fuel from. Once the system runs, the AdBlue is top of the list to be pulled through. Until then it sits beneath the diesel, and that is why a car topped up in Grade yesterday and not started stays the straightforward case, as long as nobody turns your key. Once it's sucked in, the harm takes two forms. As its water goes, the urea left behind crystallises, and the crystals block filters and settle in fine passages. And it's corrosive to some of the metals a fuel system is made from, so it keeps working on the parts it hits for as long as it stays there. By daybreak, a vehicle sitting in Ruan Minor with AdBlue through its pipework gets worse; if it is just inside your tank, it doesn't. The water in it does harm of its own: your high-pressure pump and your injectors rely on diesel to lubricate them, and water offers them nothing. ## Petrol or AdBlue in a diesel: why AdBlue is regularly worse A fault of thinned fuel is what you get from fuelling a diesel with petrol at the another forecourt nearby. It mixes with your diesel, and while it is inside that tank it causes no damage; the damage comes from running the motor on it. The trouble with AdBlue in a diesel is a completely unsuitable substance. Since it does not burn, running it through is not an option. It does not stay mixed, so it can't be diluted. And crystals and corrosion do not wash out with the next tank of fuel. That's why the flush matters more with AdBlue than with petrol, and why starting your motor "to see" costs more here than nearly anywhere else, whether the vehicle is in Treal or the middle of Ruan Minor. The same good news applies as with petrol. If the motor hasn't run, the AdBlue is still in that tank, and your tank is the easiest part of a fuel system to clear, wherever across Cornwall your car is standing. ## How does AdBlue end up in a diesel tank in Ruan Minor? It is not on purpose. Many cars have the AdBlue cap alongside the diesel inlet, now and then under a single flap, and muddling them up is simple after dark. A bottle picked up when heading home and poured in at home, instead of at the forecourt, is the usual story. The ways it takes place are few and familiar. A warning light comes on during the school run, and the top-up happens in a hurry outside Grade-Ruan CofE Primary School. Someone tips the container in at home, just off Mundys Field, as the day ends. One more pattern: dim light, a pub car park outside The Cadgwith Cove Inn, and someone using that flap for the first time. It happens most in the vehicles drivers know least: a hire car, a new motor, a company car, or the second vehicle of a household with one diesel and one petrol. Wherever you are around Ruan Minor or the remainder of Cornwall, it is the same slip and the same first answer: leave the car off. ## Started your engine with AdBlue in your diesel tank around Ruan Minor? Then that tank is no longer where the AdBlue is. With any running, it goes on to the high-pressure pump and every injector, after passing via the filter and pipework. Rough running, smoke, dropping power, dashboard lights or cutting out: each may show up, maybe part way across Ruan Minor or returning from Sea Acres 9 hole course. When safe, pull over then turn it off — with no restarting to see. More of that is pulled through with each start. Leave the M5, over 50 miles from Ruan Minor, at the first junction and stop somewhere safe, not driving on. Every mile pushes the AdBlue further into your system. That is why crossing Ruan Minor to park beside St Rumon and a drive of under 25 miles for Truro are such separate jobs. Let us know about how far it had come. Our technicians do all of the flushing where your car has stopped, and once your engine has been run there is more of it. Very seldom does it leave long-term damage if it's caught quickly. ## Draining AdBlue in a diesel around Ruan Minor: what it takes Wherever it has come to rest around Ruan Minor — a filling station, a layby, a drive, a street by St Mary — the van comes to your car. Before anything else our engineers ask what was put in, roughly how much, and whether the engine has run, because those answers determine this work. Next, draining your tank right there takes out the polluted diesel along with the AdBlue in one go. A careful flush counts much more after AdBlue than with petrol, because what remains will not wash away by itself. Next, the fuel filter: flushed, or changed if it must be. Then clean diesel, and then a check of your car. Not run? In that case count on about half an hour once we are there for most jobs. Low-noise enough to use outside a house at night, and safe on a busy forecourt, the pumps are explosion-proof. Fresh diesel goes in to prime your system, and that is the final step. You head off as soon as we have fired it up, and it makes no difference whether the vehicle is on a driveway in Ruan Minor or in a bay at Penmere. The test before our technicians leave is that it runs smoothly on clean diesel. We do it all wherever the vehicle has stopped, and it never needs to go to a workshop. At the end, you are given the paperwork for your insurer: a VAT invoice plus a written report from the engineer. ## About Ruan Minor and where it is Ruan Minor is a small village on the Lizard Peninsula in Cornwall, situated near the coast at an elevation of around 64 metres. Ruan Minor lies within a short distance of several nearby settlements, including St Ruan, Poltesco, and Cadgwith, and is approximately 19.5 miles from the city of Truro. Ruan Minor is characterised by its predominantly detached housing stock, reflecting its rural setting. Ruan Minor is located in the South West region of England, some 244.4 miles from London. ## AdBlue drains across Cornwall, Ruan Minor included St Ruan, Poltesco and Cadgwith are among the places around Ruan Minor that the same vans reach, along with most of Cornwall further out, throughout the TR postcode area. Near a border, or anywhere awkward to explain? Asking is better than guessing, and so ring. No towing is needed. In Ruan Minor, a coastal village, a mobile service works: your vehicle is drained where it stands, whether in a driveway, a residential street, a parking area or a filling station. ## AdBlue in a diesel tank around Ruan Minor: the cost of fixing it Since each callouts vary, a flat price would not be fair. What shifts the price is, firstly, whether your engine has run and for how long; then how much AdBlue went in; and finally where the car is and whether our van can reach it safely, which is easier on an open drive than in a tight space behind St. Ruan's Well. Before a figure, not after, each enquiry from Ruan Minor opens with three checks: the fuel, the amount, plus whether it ran. Those replies narrow the range down to one figure. Priced on the call before the van sets out, the job is paid for that day — card or phone, no deposit. While the van is on the way, dig out your insurance: plenty cover misfuelling. ## Ruan Minor: still next to your car? Not touching your car is, then, the best thing open to you. Keys out; motor and ignition off. Petrol in Diesel handles the remainder, across Ruan Minor or anywhere within Cornwall, after you ring 0333 366 0103 to say it was AdBlue, about how big an amount, and if it ran.