--- title: Guston: AdBlue in a Diesel Tank, Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/guston-kent/ location: Guston county: Kent latitude: 51.154950 longitude: 1.319710 service: AdBlue in a Diesel Tank updated: 2026-10-16 --- # AdBlue in a Diesel Tank in Guston: How It Happens and How to Avoid It Keep your engine and ignition off and ring 0333 366 0103 now — the rest can wait when AdBlue is already in the diesel tank. Normally, if your motor has not turned, it's emptied and thoroughly purged where the vehicle sits around Guston. If you're reading before it has happened, the rest of this page is about why it occurs and how to make sure it does not. ## Two fillers, two tanks: AdBlue in a diesel vehicle Many modern diesels in Buckland Valley, as well as Guston, carry on two fluids; your motor gets only the diesel. Its own tank keeps it, and from there it is sent to the exhaust, where a spray cleans the fumes. There is a filler on each tank. Many of cars share a single flap for both, whereas others put the AdBlue filler to your boot or under the bonnet. At the pump, your diesel side is topped up constantly. Seldom filled, AdBlue usually comes out of a bottle, poured by someone who has to stop and think what cap to use. The slip lives in that gap. ## How AdBlue in the diesel tank happens around Guston Three things tend to line up, and carelessness is seldom one of them. Haste comes from the warning. The vehicle warns you as AdBlue runs low, and an empty tank puts it into limp mode — so the top-up gets done quickly, before work on a driveway off East Langdon Road, or on the way home in the car park at The Chance Inn. Then the car is strange. A hire car, a new vehicle or a company car puts the fillers where your last one didn't, and the hand reaches for the cap it would have used on the old one. A spout-topped bottle meets no obstacle at a diesel filler no more than at an AdBlue one. So the pour, once started, carries on. It takes seconds, be it in Pineham or right in the heart of Guston. ## How to tell the AdBlue filler from the diesel one Check these first, at a forecourt in Guston or a driveway out in Whitfield. Seconds, no more. - Check the cap rather than going by position: AdBlue caps are frequently blue or marked "AdBlue", and diesel caps usually are not. - On plenty of motors, size tells: AdBlue gets the smaller filler neck. - Look inside your fuel flap: plenty of cars carry a label there showing which fuel goes where. - Cannot see it beside the diesel inlet? In that case check below the bonnet or in your boot — the owner's manual will say where. - Check with the person who drove it last — before you leave, not when the light comes on — when you pick up a hire or company car from somewhere like the car park at Martin Mill. ## Keeping AdBlue out of the diesel tank when you top up A routine for the day the light comes on, wherever across Kent that is. - Pull in somewhere level, motor off, with time in hand — not rushing on the side of Pineham Road. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds silly and it works. - The diesel cap remains on. When both share a flap, confirm it is shut before the bottle comes up. - Finish once the tank fills or the bottle is empty; before that, pour slowly through its built-in spout. - Only after that, start the vehicle: close the cap, check again, and make sure your diesel cap was never opened. Spot at step two or three that it has already gone into your diesel side? So stop right there. Skip stage five altogether. ## Guston: already put AdBlue in the diesel tank? Brief order, then. Top of that: the motor remains unstarted. On plenty of diesels the ignition alone runs the fuel pump, and so don't switch the car on. AdBlue doesn't mix with diesel — it sinks to the bottom of the tank, where the fuel is pulled from — so don't top up with diesel to dilute it. If you are on a forecourt, whether it is the Shell or the Tesco, ask the staff to help roll the car clear of the pump. If you are on your own driveway in Guston, leave it where it is. If the motor has already run, stop as soon as it is safe then switch off. Guston sits under 10 miles from the M20; there, take the next junction. About how far did it go? Hopping across Guston is smaller a job than a trip of under 15 miles to Canterbury, and so tell us. ## When our technicians arrive around Guston, what occurs? Our technicians come to the vehicle wherever it has stopped, whether that's outside Guston Church of England Primary School, near St. Martin of Tours or on your own driveway. Both the work and our price rest on three answers — which fluid, what quantity, and if it's run — so our engineers ask. Nobody sets off until you've had the quote by phone. The fuel system is then cleaned thoroughly, after your tank is emptied. Much more than with petrol, it matters here: the crystals build up, some metals are attacked, and none of that washes out unaided, no matter how long it is left. The filter is flushed, or replaced where it needs to be; clean diesel goes in; and the vehicle is tested. Before leaving, we start the car and check that it's running smoothly. Most jobs are done in roughly half an hour after our technicians get there, as long as the engine has not run — and the pumps we use are safe on a live forecourt and quiet after dark beside a house. Your insurer will ask for an engineer's report and your VAT invoice, and you get both at the end. Payment comes on the day, with no money upfront. While we travel, have a look at your policy; plenty carry cover for misfuelling. ## About Guston Guston is a small village in Kent, situated near the coast and overlooking the English Channel. Guston sits on a hill at an elevation of around 112 metres, with views of the surrounding countryside and the nearby villages of Pineham and Church Whitfield. Guston is characterized by its predominantly detached housing stock and is located near the city of Canterbury, which is approximately 13.5 miles away. Guston remains a quiet residential community with a population of around 808 people. ## AdBlue drains around Guston, and Kent beyond Guston is a coastal village, and our vans that cover it also work the towns near it, Church Whitfield and East Langdon among them, across the CT postcode area. A postcode starting CT15 5 gets the van to you fastest. The vehicle remains put. Wherever it sits — near Dover District Leisure Centre, on a layby heading to Guston Green, at home — that's where it is cleared. Ring and ask instead of guessing if you're close to a boundary, or somewhere hard to explain, like the back of St. Peter. ## In short, for Guston drivers Read the cap before you tip. If AdBlue has gone in your diesel tank anyway, leave the vehicle off and ring 0333 366 0103. Petrol in Diesel clears it where it stands, anywhere across Kent.