--- title: St Johns: AdBlue in a Diesel Tank, What Next canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/st-johns-kent-tn4-9/ location: St Johns county: Kent latitude: 51.141240 longitude: 0.263120 service: AdBlue in a Diesel Tank updated: 2026-10-28 --- # What Now? AdBlue in the Diesel Tank in St Johns Has your motor turned over since the AdBlue got in? That one question decides almost everything else from here. Out in Sherwood or right in St Johns, an unstarted motor should remain unrun. Usually this is emptying and thoroughly cleaning it on the spot around St Johns — and so leave the key and engine off then phone 0333 366 0103. If it's run, stop as soon as it is safe then switch off. The job is bigger, yet the first stage is the same. Match your case to a situation from the list below, wherever in Kent you happen to be. ## AdBlue in a diesel on a St Johns forecourt Just now, bottle still in your hand, it dawns on you that the cap you opened was the wrong one, right at the pump. Somewhere in St Johns, then — BP, Shell, or somewhere else close by. Meaning? Spotting it on the forecourt is as good as it gets. The AdBlue is in your tank and nowhere else. Nothing has sucked it in. Your move: keep out of the car, however much the pump wants freeing. Ring us from the forecourt after the vehicle is in a space — the staff will help push it — then save the bottle. Draining it right at the pump is possible if it can't be shifted, since the equipment is explosion-proof. ## AdBlue in your diesel tank on a St Johns drive? Several days had passed with the dash light on. You bought a bottle, poured it in on the driveway, and only when you put the empty bottle in the recycling did you look again at the cap. Houses just off Chilston Road get hit as often as everywhere else. Meaning? As long as your vehicle has not been driven since, it's second to the forecourt case. At the bottom of the tank sits where AdBlue waits, since it will not blend with diesel — and a night passing makes nothing of the difference. Keep the keys indoors tonight — otherwise a person might drive it off at breakfast — and call us. Our technicians drain the car on your drive, whether that is in St Johns or out in St James. The pumps are quiet enough to use outside a house after dark. ## AdBlue in a diesel and already driving around St Johns? You filled up, set off, and a mile or two later your motor began to run unevenly, smoke, lose power or light up the dashboard. Somewhere along Newcomen Road or heading towards Brighton and Hove — under 50 miles away. Meaning? The fuel pump has taken the AdBlue in. Distance decides how deep it goes: filter and pipework to begin with, then the high-pressure pump and every injector. Each restart, like every mile, carries it on. Stop safely — that's the first job — then turn everything off. Service stations further on are too far: from the M25, under 15 miles out of St Johns, take the next junction. Don't restart it to see if it has cleared; it will not have. Let us hear the mileage driven when you ring. ## AdBlue in the wrong tank of a hire, lease or company car It is a car you have had for a week. Unbeknown to you, the two inlets are next to each other here — not like your own car, which has none or stores it in another spot. Throughout Kent, nobody is safe from it. Meaning? Whatever case above applies too — run or not — and one further step. Plenty of rental and company contracts need the owner's approval for repairs. What to do: ring the hire firm or your fleet manager first, then us. That is faster settled before our engineers arrive than after. Waiting for an answer in the car park at Tunbridge Wells, or beside Skinners' School Sports Hall? Leave the car off meanwhile. ## Unsure about AdBlue in the diesel tank around St Johns? Occasionally the honest answer is "I think so". A faint ammonia-like smell hangs around the filler, the bottle feels too light, and which cap came off is hard to recall. It might have been at a friend's driveway in Denny Bottom, or rushing by St Barnabas CofE VA Primary School at the school run. What it means: a little spilled about your filler does no harm to the motor. If it is inside the diesel tank, though, it does. Turning on the car cannot tell you which, and if there is AdBlue in that tank it would draw it in. Take it that it went in, and never start the engine. Ring us and describe what you saw; we would rather check a tank that turns out free of AdBlue than drain one that has already been run. ## The common ground in every St Johns AdBlue drain Whatever the case, a single opening applies. Three things come once our technicians reach your car — at a forecourt, a drive, a street by St. John's Church or the car park outside Saint John's Yard: the fluid, the amount, and if the motor has been started. Your price is given over the phone, before a van leaves, and those answers set the job. AdBlue crystallises and is corrosive to some metals in fuel systems, and so it does not wash out on its own; that is why a full flush, after the drain, matters much more here than with petrol. Finally come your filter, cleaned or renewed as needed; clean diesel; and a check of your vehicle. Most unstarted cars are a half-hour visit after the moment our engineers arrive. Our engineers fire it up last. We check it runs smoothly on clean diesel before we go. Our technicians do the whole job where your car is, and permanent damage is very uncommon if it has been caught early. Payment is that day, never upfront. For your insurer, there is a VAT invoice and a report from the engineer. Many insurance policies include misfuelling cover, and so it's worth checking yours while we are on the way. ## About St Johns, for a moment St Johns is a suburban area in Kent, situated inland at an elevation of 122 metres, and is located approximately 30 miles from London. St Johns is characterized by its predominant housing type, which is flat, and is near to other places such as St James and Royal Tunbridge Wells. St Johns has a population of around 10818 people and is close to the nearby city of Brighton and Hove, which is 28 miles away. St Johns is also near to High Brooms, another local area. ## St Johns and Kent: AdBlue drains across the area St Johns is a residential suburb, and the same teams that cover it work the towns around it too, Royal Tunbridge Wells and High Brooms among them, across the TN postcode area. Your location comes quickest from a postcode beginning TN4 9. Centre of St Johns or a layby towards St John's Recreation Ground: either way it sits, the car never needs to move an inch for this drain. The drain happens right there. Ring and ask rather than guess when you're by Edward Hoare Memorial, near a boundary, or anywhere tricky to pin down. ## The one-line version Still unrun? Leave the vehicle off and phone. Run by now? Pull over, turn off, ring. Petrol in Diesel takes over the rest whichever it is, in St Johns and Kent, on 0333 366 0103.