--- title: Probus: AdBlue in a Diesel Tank? Don't Start canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/probus-cornwall/ location: Probus county: Cornwall latitude: 50.293010 longitude: -4.951090 service: AdBlue in a Diesel Tank updated: 2026-10-22 --- # Probus: AdBlue in the Diesel Tank? Leave It Off AdBlue in the diesel tank? Then keep the motor off — and the ignition too. In plain terms, AdBlue is simply urea in water. The trouble begins once it is pulled through your lines — it won't ignite, and it will not blend with diesel. Caught before the engine has been run, AdBlue in a diesel tank is generally a drain and a thorough flush, done where your car is around Probus. Before you do anything else, ring 0333 366 0103. ## Those opening minutes: AdBlue in the diesel tank around Probus Do: - Keys out — that way nobody can power anything on. - If you are anywhere near moving traffic, put the hazard lights on. - Which product, and about how much volume? Save the bottle or the receipt, and our technicians will know. - Ring right where you are. Say a TR2 4 postcode or the nearest street name, and nobody has to hunt for you. Don't: - Do not start your engine, even for a moment to shift the vehicle. - The ignition stays off: on lots of diesels, switching it on is enough to start your pump. - Don't top up with diesel to thin it. AdBlue does not dilute in diesel; it separates out. - Don't drive the vehicle anywhere, not even a short stretch down Chapel Street. - Beside the road, don't try emptying it on your own. Get the attendants to help you roll the vehicle away from the island if you are on a forecourt around Probus, whether it is the Gulf or elsewhere. Parked on your own drive? Then it remains just where it is. ## AdBlue in a diesel tank, and what it does there The engine isn't what AdBlue is made for; the exhaust is. Kept in a dedicated tank, it's squirted into the exhaust to clean the fumes. Neither side suits the other: urea does not belong in an injection pump, and a pump cannot deal with urea. It doesn't combine. Once it's poured into the tank, AdBlue behaves not at all like diesel. It drops, because it's denser than diesel, and pools low where the pickup draws its supply from. Once the pump runs, the AdBlue is first to go through. Until then it sits underneath the diesel, which is why a vehicle filled in Ladock last night and not switched on remains the straightforward one, provided no one touches your key. It causes two kinds of harm from there. It eats at certain metals found in fuel components, working on whatever it touches until it's cleared from the system. And when the water goes, the urea turns into crystals that block filters and lodge in narrow channels. A car left standing around Probus with AdBlue already in its lines is worse by the morning; one with AdBlue only in its tank isn't. Then there's the water: it offers no lubrication to the components that rely on it the most — the injection pump and every injector. ## Why is AdBlue in a diesel often the bigger problem? Petrol put into a diesel on Texaco's forecourt leaves the fuel watery — that is the whole issue. Mixed through your diesel and left still, it's no threat for now; running the engine does the harm. AdBlue in a diesel is another matter: not thin fuel, yet no fuel at all. It can't simply be run through, because it doesn't burn. Crystals and corrosion stay after the following fill, and AdBlue separates again from the diesel, and so thinning it won't help. Hence the flush counts so much, and turning the key "to see" costs more here than almost any other mistake — in Grampound Road or the centre of Probus equally. The good news is the same as with petrol. Clearing a tank is the easiest job on a fuel system, and with no running, the AdBlue remains in there — anywhere across Cornwall the vehicle sits. ## How AdBlue ends up in a diesel tank in Probus No one means to do it. The AdBlue filler on plenty of vehicles waits right next to your diesel filler, occasionally under the same flap, and the two caps can look alike in poor light. A container bought while driving home and tipped in outside the house, rather than at the forecourt, is the typical route. The ways it takes place are few and familiar. Halfway through the morning drop-off, the dashboard flags it up, and outside Probus Primary School the refill is hurried. Close to Tregony Road, a driver pours a container in on that drive after work. Else, in dim light outside The Hawkins Arms, the vehicle is topped up by someone using that flap the first time. Rented motors, brand-new cars, company motors, or the spare car in a family with one of each: the least familiar cars see it most. Anywhere in Cornwall, Probus as well, the slip does not change, and nor does the first step: leave it off. ## Already started the engine with AdBlue in your diesel tank around Probus? The AdBlue has left the tank, then. Given any running time, it goes on to the injection pump and every injector, after passing via the filter and pipework. Maybe coming back from Rosparc, or midway across Probus, the motor might go rough, smoke, drop power, flash the dash or cut out. Once you safely can, stop then turn everything off — without turning it on again to test. Each start pulls more of that through. Leave the M5, over 50 miles from Probus, by the next junction and stop somewhere safe, rather than carrying on. Hopping across Probus to the car park by St Probus & St Grace is one matter; heading towards Truro, under 5 miles away, is another, because every mile carries the AdBlue further in. So mileage counts. Tell us roughly how far it had come. There's more to rinse out once your engine has been started, and we do all of it where the vehicle has stopped. Very seldom does it leave long-term damage if it's caught quickly. ## Probus: how AdBlue is emptied from a diesel The vehicle stays where it is, whether that's a road near Probus Village Hall, a drive, a lay-by or a filling station in Probus, and our van comes to it. Three answers shape the work, so first our technicians ask which fluid got in, about what quantity, plus whether the engine has turned over. Then your tank is emptied where the vehicle waits, so the contaminated fuel and the AdBlue come out together. The fuel system is purged thoroughly, which counts more with AdBlue than with petrol, since what it leaves behind does not rinse out on its own. Your filter is cleaned, or replaced where it needs to be; clean diesel goes in; and the car is tested. Engine not run? Then expect about half an hour once we are there for most jobs. The pumps are explosion-proof, fine on a working forecourt and quiet enough to use outside a house at night. Clean diesel goes in to bleed your system, and that's the final step. Firing it up comes next, and then you drive off from where the car is parked, by Truro or on a drive in Probus. Before we leave, our technicians make sure it is running smoothly with new diesel in. No workshop is required at any point, with the whole job done on the spot. You receive a VAT invoice and an engineer report later, which is what insurers want. ## About Probus itself Probus is a village in Cornwall, situated inland at an elevation of 84 metres, approximately 4.9 miles from the city of Truro. Probus is surrounded by nearby places such as Parkengear, Tresawle, and Freewater, and is characterized by its predominantly detached housing. Probus has a population of around 1937 residents, and is located about 226.3 miles west of London. ## AdBlue drains in Probus and across Cornwall Parkengear, Tresawle and Freewater are among the places near Probus that the same vans reach, along with much of Cornwall beyond, throughout the TR postcode area. Ring and ask rather than guess if you're close to a county line, or somewhere tricky to explain. Anywhere your vehicle stands — a driveway at home, a side street, a parking area, a forecourt — our technicians drain it on the spot, and there's no need to bring it to us; which suits Probus, a rural village, well. ## AdBlue in a diesel tank in Probus: the cost of fixing it Not one single figure could be honest, since every job differs. Whether your engine has been running, and for how long, comes first in what shifts the price. How much AdBlue was put in comes next, and then the position of your car, because an open drive is easier for a technician to reach safely than a tight space behind Grampound Road Cricket Club. That is why each call from Probus starts with the same three questions, asked before giving a figure, not after: what got in, how much, and whether it has run. The replies turn a range into a straight price. Priced by phone before the engineer heads out, it is paid for on the day — card or phone, no deposit. Check your policy while we are on the way: plenty include misfuelling cover. ## Beside your car in Probus, still? Then, the best thing to do with the vehicle is to not touch it. Keys out; engine and ignition off. Call 0333 366 0103: AdBlue, roughly how much, plus if the engine ran are all we need. Petrol in Diesel takes over the rest across Cornwall, Probus too.