--- title: AdBlue in a Diesel Tank North Dimson? Read This canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/north-dimson-cornwall/ location: North Dimson county: Cornwall latitude: 50.525680 longitude: -4.224200 service: AdBlue in a Diesel Tank updated: 2026-10-28 --- # AdBlue in a Diesel Tank in North Dimson: How It Happens and How to Stop It AdBlue already in the diesel tank? Then set this page down a moment, keep the ignition and engine off, then ring 0333 366 0103. Around North Dimson, catching it before the motor runs usually leaves draining and a full flush where it stands. The remainder of this page explains why it occurs and how to ensure it does not — handy if you're reading before it has happened. ## AdBlue in a diesel motor: two tanks, two fillers Diesel goes to the engine — but many current diesels driven round North Dimson and Higher Dimson carry a second liquid as well. AdBlue goes to your exhaust, where it is sprayed into the gas to fresh it, and it lives in a tank of its own. Different tanks, separate fillers. Plenty of cars share a single flap for the two, whereas some move the AdBlue filler to your boot or under the bonnet. Filling your diesel side at the pump goes on all the time. Much less frequently, the AdBlue side is topped up — mostly from a bottle, by someone working out where it goes. That gap is where the slip lives. ## How AdBlue in the diesel tank takes place in North Dimson Carelessness seldom causes it. Instead is three things lining up together. Hurry follows from the warning. The car tells you as AdBlue runs low, and a dry tank puts the vehicle into limp mode — so the top-up gets done in a rush, before work on a drive off Bitthams Lane, or on the way home in the car park outside The Buccaneer. Next, the hand goes for the cap it would have used on the old car — since a rental car, a new car or a company car puts the fillers somewhere your last one did not. A spouted bottle meets no resistance at a diesel filler any more than at an AdBlue one. So the pour, once begun, carries on. Whether it takes place in Middle Dimson or the middle of North Dimson, it is the same few seconds. ## Which filler is for AdBlue, and which for diesel? Before you tip anything, whether on a drive in Gunnislake or a forecourt around North Dimson, check these. They take a few seconds. - Colour and marking: an AdBlue cap is commonly blue, or says "AdBlue", where a diesel cap usually does not. Go by the cap, not its position. - Look at the size: the smaller filler neck is, on many vehicles, the AdBlue one. - The flap. Look inside the fuel flap for a label. Many vehicles say there which fuel goes where. - In the boot or under the bonnet: that's where your filler is if it is not by your diesel cap, and the handbook tells you which. - Ask the person who drove it last — before you leave, not when the light comes on — if you collect a hire or company car from somewhere like the car park outside Gunnislake. ## How to top up without AdBlue in the diesel tank Anywhere around Cornwall the light comes on, this is a routine for that day. - Park then switch off. Not on a slope, not with the engine running, and not in a rush on the side of Delaware Road. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds daft and it works. - If both sit under one flap, check your diesel cap is still closed before you lift the bottle — and leave the car on. - Tip slowly, using the bottle's own spout. Stop when it is full or when the bottle is empty. - Close the cap and check a second time. Make sure your diesel cap was never opened. Only then start the car. Stop there if you find, at step two or three, that you've already poured into your diesel side. Leave out step five altogether. ## North Dimson: already put AdBlue in your diesel tank? Short order, then. First: the engine stays off. Keep the ignition off as well, since on many diesels switching it on alone runs your fuel pump. Filling up with diesel will not dilute it: rather than mixing, AdBlue drops to the bottom of the tank, right where the fuel is drawn from. The attendants at Asda, Gulf or any forecourt will usually lend a hand to push the vehicle away when you ask. At home around North Dimson? Then the car remains put. If your motor has already run, stop as soon as it is safe then switch off. North Dimson lies under 50 miles from the M5; on it, use the first junction. Tell us about how far it went: a run towards Plymouth, under 15 miles away, is a bigger job than a short hop across North Dimson. ## North Dimson: what takes place when our engineers get there Our van comes to the car anywhere it stopped — your own driveway, near Gunnislake Clitters Mine, or outside Copper Valley Junior Academy. Both the work and the price depend on three replies — what fluid, what amount, and if it has run — so our technicians ask. No one sets off until you have had our price by phone. The fuel system is then rinsed thoroughly, once the tank is drained. With AdBlue that matters more than with petrol: it crystallises and is corrosive to some of the metals in a fuel system, and so it doesn't wash out on its own. Your filter is flushed, or replaced where it needs to be; clean diesel goes in; and the car is tested. Your engine is started next and tested to make sure it runs properly, all before our technicians leave. Using pumps fine on a busy forecourt and quiet enough to use outside a house at night, most jobs where your engine hasn't run need about half an hour after our engineers arrive. Nothing upfront; you settle up that day. Afterwards, the VAT invoice and a report from the engineer go to you for your insurer. Before we get there, take a look at your policy; many include cover for misfuelling. ## About North Dimson itself North Dimson is a suburban area situated on the riverside in Cornwall, with a mix of detached housing and a population of around 829 residents. North Dimson sits at an elevation of 146 metres, close to the nearby settlements of Middle Dimson, Dimson, and Lower Dimson. North Dimson is located near the city of Plymouth, which is approximately 11.3 miles away, and is part of the wider South West region of England. North Dimson is also relatively distant from London, at around 190.5 miles away. ## North Dimson and Cornwall: AdBlue drains across the area Throughout PL postcodes, the teams covering North Dimson — a residential suburb — work the surrounding locations too, Lower Dimson and Dimson among them. A postcode starting PL18 9 gets the van to you fastest. Your car doesn't need to shift. Anywhere it stands — near Wheal Frementor;Wheal Freementor, on a lay-by heading to Millennium Garden, on a drive — that's where it gets cleared. If you're close to a border, or somewhere hard to explain like the back of Gunnislake Crusade Fellowship Centre, ring and ask instead of assuming. ## For North Dimson people, the short version Pour nothing till you have read the cap. Petrol in Diesel empties it where it stands, anywhere across Cornwall, if AdBlue has gone in your diesel tank anyway — and so leave it off then phone 0333 366 0103.