--- title: AdBlue in a Diesel Tank St Marks: What Now canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/st-marks-gloucestershire/ location: St Marks county: Gloucestershire latitude: 51.896830 longitude: -2.111490 service: AdBlue in a Diesel Tank updated: 2026-10-04 --- # St Marks: AdBlue in the Diesel Tank? Find Your Situation Everything turns on one detail: whether your motor has been run since the AdBlue was added — more than anything else. If it hasn't, keep it that way, whether your car is in St Marks itself or out in Bournside. Phone 0333 366 0103 with the key and motor both off. In St Marks, such a case is typically emptied and flushed on the spot. Where the motor has been run, stop safely straight away, then switch the car off. Stage one remains unchanged, even though the job grows. Anywhere in Gloucestershire it happened, one of the situations below fits yours. ## St Marks forecourt: AdBlue in a diesel at the pump Picture it: standing by the pump, gripping the bottle, you spot the cap you opened wasn't the correct one. Somewhere around St Marks, then — Esso, Shell, or somewhere else nearby. Meaning? Spotting it here is the best it gets. Still in the tank, and no fuel pulled through: that is where the AdBlue sits. Freeing the petrol pump is no reason to run it — so don't get back in. Get the attendants to lend a hand pushing it to a bay, save the bottle, then phone us right there. Emptying it right at the pump is fine if it can't be shifted, because the equipment is explosion-proof. ## St Marks, at home: AdBlue in your diesel tank On your dash, a reminder had been lit for days. You bought a bottle, poured it in on the driveway, and only when you put the empty bottle in the recycling did you look a second time at the cap. It happens on driveways just off Spenser Road as commonly as anywhere. What it means: if you have not driven since, this is nearly as good as the forecourt. At the bottom of your tank sits where AdBlue stays, because it won't blend with diesel — and a night passing changes nothing of the difference. What to do: leave your keys inside the house so nobody moves your car in the morning. Then call. Your drive is where it is emptied, be it around St Marks or Rowanfield. Even at night, the pumps stay quiet enough for a residential street. ## Drove off with AdBlue in a diesel around St Marks? Topped up, pulled away, and soon the motor was turning unevenly, blowing smoke, down on power, or lighting up your dash. Maybe driving to Gloucester, under 10 miles away, or just along Milton Road. Meaning? The fuel pump has sucked the AdBlue up. Distance sets how deep it goes: filter and pipework first, then the high-pressure pump and every injector. Every restart, like every mile, carries it on. Next: pick a safe spot, stop, then switch the engine off. Exit by the next junction — not the services beyond — if you are on the M5, under 3 miles from St Marks. No test restarts: clearing itself isn't something AdBlue will do. Tell us know the mileage driven as you call. ## AdBlue in the wrong tank: hire, lease and company cars It is a vehicle you have had for a week. Your own motor either does without AdBlue or puts it elsewhere, so nothing warned you the AdBlue cap sits just next to the diesel. It can happen to anyone, anywhere around Gloucestershire. Put simply: one extra step on top of the cases above, and those depend on if it has run. The owner often needs to sign off the work, under many hire and fleet agreements. Do this: rental firm or your fleet manager to begin with, us second, because sorting it early saves time. If you are stuck in the car park at Cheltenham Spa, or by St Mark's Church, whilst you wait for an answer, leave the car off. ## Not sure it was AdBlue in your diesel tank, St Marks? At times, "I think so" is all anyone can honestly say. A faint ammonia smell lingers around your filler, the bottle seems too light, and the cap you took off is hard to recall. A hurried top-up by the gates of Benhall Infant School, or a visit to a friend in Hesters Way: either fit. The point: the engine is not hurt by a little AdBlue spilled around the outside. Once it is inside your diesel tank, though, it does. If there is AdBlue in that tank, turning on your car will draw it in, and it wouldn't tell you which either. Do this: behave as though it got in, and never start your motor. Call us and describe what you saw; we'd rather check a tank that turns out clean than drain one that has already been run. ## The common ground in each St Marks AdBlue drain The work begins identically, whichever your case. Three things come when our technicians arrive — on a filling station, a driveway, a road beside Dean Close School Chapel or the car park outside The National Hunt: the fluid, the amount, and whether it has been started. Your price comes over the phone, before a van leaves, and the replies set the job. A thorough flush comes after this drain. With petrol it's routine; with AdBlue it is crucial, since crystals build up and some metals are attacked, and none of it washes out unaided. Next comes your filter — flushed, or swapped when necessary — followed by clean diesel, and a test of your car. If your engine hasn't run, the majority of jobs take about half an hour once we're there. Starting the engine comes last. Before our technicians go, it's tested to be sure it runs correctly on clean diesel. Lasting damage is very unusual if it's spotted quickly, and the whole job is done where the car is. Paying comes that day, never in advance. For your insurer, there is a VAT invoice and a written report from the engineer. Plenty of insurance policies include misfuelling cover, so it's worth checking yours whilst we are on the way. ## About St Marks St Marks is a suburban area located on the riverside in Gloucestershire, with an elevation of 53 metres. St Marks sits near the city of Gloucester, approximately 6.2 miles away, and is close to nearby places such as Rowanfield and Benhall. St Marks is characterised by its predominant semi-detached housing stock, which is typical of many suburban areas in the South West region. St Marks is also situated within commuting distance of London, at around 89.1 miles away. ## AdBlue drains across Gloucestershire, St Marks included Over GL postcodes, the vans covering St Marks — a residential suburb — work nearby towns as well, Benhall and Fiddlers Green among them. A postcode starting GL51 7 is the quickest way to tell us where you are. Whether the car is on a lay-by on the way to Gloucester Road Open Space or in a car park in the middle of St Marks, it does not need to move. Draining is done right there. Assuming doesn't help near Bacon Theatre, on a county line or anywhere hard to pin down; ring and check. ## In one line: your situation Still unrun? Keep the car off then ring. Started by now? Stop, turn off, ring. Petrol in Diesel handles the rest whatever it is, across St Marks and Gloucestershire, on 0333 366 0103.