--- title: Explained: AdBlue in a Diesel Tank Coupar Angus canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/coupar-angus-perth-and-kinross/ location: Coupar Angus county: Perth and Kinross latitude: 56.546140 longitude: -3.267840 service: AdBlue in a Diesel Tank updated: 2026-10-06 --- # How It Occurs and How to Avoid It: AdBlue in a Diesel Tank in Coupar Angus If AdBlue is already in your diesel tank, stop reading for a moment: leave your engine and the ignition off then ring 0333 366 0103. Caught before the motor runs, it's normally a drain and a thorough flush, done where the car is around Coupar Angus. Nothing happened yet? Below, the page covers the why it happens and the how to prevent it for good. ## Two fillers, two tanks: AdBlue in a diesel motor Plenty of newer diesels on the roads round Coupar Angus and Kettins carry two liquids, not one. Diesel goes to the motor. AdBlue goes to the exhaust, where it is sprayed into the gas to clean it, and it lives in a tank of its own. Each tank has its own filler. Plenty of motors share a single flap for the two, whereas some move the AdBlue filler to your boot or under the bonnet. Diesel goes in on each forecourt visit, week in, week out. The AdBlue side is topped up far less regularly, normally from a bottle, and normally by a person who has to stop and think where it goes. Mistakes happen in that gap between the two. ## How AdBlue in the diesel tank takes place around Coupar Angus Three things tend to line up, and carelessness is rarely one of them. To start with, the warning. Low AdBlue brings a warning from your car, and running out leads to limp mode — so a rushed top-up, perhaps before work off Gray Street, perhaps at The Vic Inn on the way home after work. The old car's cap is where the hand goes — yet a rental car, a new vehicle or a company car keeps the fillers elsewhere. That is a second thing: a new vehicle. Third, the spout fits: diesel filler or AdBlue one, it slides in as readily, and after the tip starts, nothing halts it. Whether it takes place in Princeland or the middle of Coupar Angus, it is the same few seconds. ## Which filler is for AdBlue, and which for diesel? Be it a Coupar Angus forecourt or a drive over in Campmuir, take a few seconds on these before any goes in. - Check the cap rather than going by where it sits: AdBlue caps are frequently blue or marked "AdBlue", and diesel caps normally aren't. - Look at the size: the smaller neck is, on plenty of motors, the AdBlue one. - Lift the flap and look for a label — many vehicles show what goes in each inlet just there. - Can't see it beside the diesel inlet? Then check below the bonnet or in your boot — the handbook will say which. - Picking up a hire or company car, say at the car park at Invergowrie? Check with whoever drove the car last before you set off, rather than once the light comes on. ## AdBlue top-ups that never reach the diesel tank Wherever in Perth and Kinross the light comes on, this is a routine for the day. - Park and switch off. Not on a slope, not with the engine running, and not in a rush on the side of Hay Street. - Say "AdBlue" out loud as you unscrew the cap, after you find the AdBlue filler and reading it. Silly, perhaps, but it does the trick. - Leave your diesel cap on. If both sit under one flap, check your diesel cap is still closed before you lift the bottle. - Stop once that tank is topped up or the bottle is empty; until then, tip slowly through its own spout. - Before starting the car, shut the cap and check a second time that the diesel cap never came off. Discover at the second or third stage that AdBlue went into the wrong tank? That is where you stop. Don't go on to step five. ## AdBlue in the diesel tank already, in Coupar Angus? What follows is a short order of things, beginning with not starting the motor. Do not switch the ignition on; on many diesels that alone runs the fuel pump. Do not top up with diesel to dilute it: AdBlue does not mix with diesel, it sinks to the bottom of that tank, where the fuel is sucked from. At a forecourt — Shell, Tesco or any other — the staff will usually help roll the car clear, when you ask. Leave it where it is if you are on your own driveway in Coupar Angus. If your engine has already run, stop as soon as it is safe then switch off. The next junction means where to come off if you are on the M90, under 15 miles from Coupar Angus. A short hop across Coupar Angus is a smaller job than a run towards Perth, under 15 miles away, and so tell us about how far it went. ## When we arrive in Coupar Angus, what occurs? The van reaches your car wherever it stopped — your own driveway, beside The Y, or outside the local primary school. The answers decide the work and our quote, so our engineers ask what went in, about how much, and whether it's run. Nobody heads out until you've heard our price over the phone. Next: a drain, then a full flush of the whole system. Not like petrol, AdBlue forms crystals and attacks certain fuel-system metals, and none of it washes out unaided. Hence it counts more. Your filter is cleaned, or replaced where it needs to be; clean diesel goes in; and the vehicle is tested. We don't leave until it has been started and is running properly. Unstarted cars mostly mean a half-hour job after arrival. The kit is safe on a busy filling station, and quiet enough for a driveway late at night. No money upfront; you settle up that day. Afterwards, a VAT invoice and the report from the engineer are handed to you for the insurer. Wrong-fuel cover is included in plenty of insurance policies — and so use the wait to look at yours. ## About Coupar Angus and where it is Coupar Angus is a town situated on the banks of the River Isla in Perth and Kinross, with a population of around 2138 people. Coupar Angus has a mix of housing types, but semi-detached homes are the most common. Coupar Angus is located near several smaller communities, including Princeland, Markethill, and North Corston. Coupar Angus sits at an elevation of 58 metres, approximately 12 miles from the city of Perth. ## AdBlue drains across Perth and Kinross, Coupar Angus included Markethill and North Corston are among the towns near Coupar Angus, a riverside town, that the same vans cover, over PH postcodes. Our van reaches you fastest with a postcode starting PH13 9. There's no need to shift the car. Draining happens on the spot, whether a driveway, a road by Town Cross, or a layby on the way to Buttery Bank plantation. Ring and ask rather than assuming if you're near a boundary, or somewhere hard to explain, like the back of Coupar Angus Public Library. ## For Coupar Angus drivers, the short version Pour nothing till you have read the cap. Petrol in Diesel empties it where it stands, anywhere across Perth and Kinross, if AdBlue has gone in the diesel tank anyway — so leave the car off and phone 0333 366 0103.