--- title: Don't Start It: AdBlue in a Diesel Tank Quedgeley canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/quedgeley-gloucestershire/ location: Quedgeley county: Gloucestershire latitude: 51.825430 longitude: -2.280460 service: AdBlue in a Diesel Tank updated: 2026-10-13 --- # Don't Start It: AdBlue in a Diesel Tank in Quedgeley With AdBlue in your diesel tank, your ignition remains off and so does the engine. AdBlue is urea mixed in water. It does not burn, it doesn't mix with diesel, and the harm it does begins when your fuel system draws it in. In Quedgeley, AdBlue in a diesel tank caught before your engine runs usually means a drain and a thorough flush, just where your car is. Before you do anything else, phone 0333 366 0103. ## What to do straight away, Quedgeley: AdBlue in your diesel tank Do: - Keys out — that way no one can power anything on. - If you're at all near moving traffic, put the hazards on. - Which product, and roughly what volume? Hang on to the bottle or the receipt, and we will see. - Tell us a postcode starting GL2 4, or whatever street is closest, and our van reaches you directly — so call wherever you stand. Don't: - No starting your motor — not briefly, not to shift the car. - Don't switch your ignition on. On plenty of diesels that alone runs the fuel pump. - No extra fuel added. The AdBlue won't mix, so it is pointless. - Even a short way up Church Drive is too far to drive it. - Do not try to drain the car yourself at the kerbside. At a forecourt around Quedgeley, whether it is the Tesco or another one, ask the attendants to help you roll the vehicle away from the petrol pump. If you are on your own drive, leave the vehicle just where it is. ## AdBlue in a diesel tank: what it does The engine isn't what AdBlue is made for; your exhaust is. Its own reservoir keeps it, and from there it's sprayed into the exhaust, where it treats the gas. No part in a fuel pump is designed for this fluid — and no part of it was intended to go that way. Inside a diesel tank it acts very differently from fuel. It doesn't mix in. It's heavier than diesel, so it sinks and collects at the bottom of that tank, which is where the pickup sucks fuel from. Simplest of all: a vehicle that got AdBlue in Hardeicke last night and hasn't turned since. The AdBlue sits at the base of that tank, undrawn — though it would be the first thing through once your motor runs, before any diesel at all. Once it is drawn in, the damage comes in two forms. It attacks some metals used in fuel components, working on any part it touches until it's removed from the system. And when the water goes, the urea forms crystals that clog filters and lodge in tiny passages. Overnight, a vehicle sitting around Quedgeley with AdBlue through its pipework gets worse; where it's only in your tank, it doesn't. The water in it does damage of its own: the high-pressure pump and your injectors depend on diesel to lubricate them, and water offers them nothing. ## Why AdBlue in a diesel is regularly more serious than petrol Petrol pumped into a diesel on Asda's forecourt makes your fuel thin — that is the main problem. It mixes with your diesel, and while it is in the tank it does no damage; the damage comes from running your motor on it. With AdBlue in a diesel, the fluid itself is simply the wrong one. It cannot just be run through, because it does not burn. Nor can it be watered down, because it splits back out — and the next tankful will not clear away deposits or corrosion. So the flush counts for more here, and trying the engine "to see", in the heart of Quedgeley or out in Lower Tuffley, costs more than almost any other slip. As with petrol, there is good news. Emptying a tank is the simplest part on a fuel system, and without start-up, the AdBlue stays in it — anywhere in Gloucestershire your vehicle has stopped. ## How AdBlue ends up in a diesel tank in Quedgeley In dim light, two caps side by side — the AdBlue one and the diesel cap, occasionally under one flap — can look the same. No one means it; many designs invite it. Mostly it happens with a bottle bought on the way home and poured in on the drive, not at the forecourt. It tends to happen in a couple of familiar ways. Midway through the drop-off, the dashboard warns, and outside Beech Green Primary School the top-up is hurried. A driver tips the container in at home, right off Saint James' Close, as the day ends. Else, in dim light by The Haywain, the car gets refilled by a driver using that flap the first time. It happens most in the motors people know least: a hire car, a new vehicle, a company car, or the second motor of a household with one diesel and one petrol. Same slip, same first response — leave it off — wherever you are in Quedgeley or the remainder of Gloucestershire. ## Quedgeley: started the engine with AdBlue in the diesel tank? The AdBlue has left that tank, then. Via the filter, along the pipework, and — given any running time — into the injection pump and every injector: that is how far it travels. Lumpy running, smoke from the exhaust, dropping power, dashboard warnings or cutting out: each may show up, perhaps part way across Quedgeley or returning from Quedgeley Nature Reserve. Stop as soon as it is safe, switch off, and do not restart the car to check. Each start pulls more of that through. On the M5, under 3 miles from Quedgeley, the first junction is where to exit, and somewhere safe is where to park — not carrying on. How far it went matters. A few hundred yards across Quedgeley to the car park by Saint James is a very different job from a run towards Gloucester, under 5 miles away, with the AdBlue reaching further into the system with each mile. Tell us roughly how far it had come. Once the engine has run, the flush includes more, and all of it is done where your car has come to a stop. Long-term damage is very uncommon if it is spotted early. ## What clearing AdBlue from a diesel involves in Quedgeley A street by Quedgeley Library, a driveway, a lay-by or a filling station: wherever your vehicle has stopped in Quedgeley, our technicians travel to it. Which fluid went in, about the quantity, and whether the motor has been run: we check before all else, because those decide the job. Then your tank is drained where the car waits, so the tainted fuel and the AdBlue come out together. Residue from AdBlue won't flush away by itself, and so the whole system gets a full flush, which matters much more here than with petrol. Clean diesel goes in once your filter is cleaned — or replaced, if it needs to be — and then your vehicle is tested. Not run? In that case count on about half an hour once we are there for most jobs. Explosion-proof pumps make a live forecourt sensible to work on, and they're quiet enough not to disturb the neighbours at night. Priming the system with new diesel comes last. Then we fire it up and you drive off, whether from a parking bay outside Gloucester or a driveway around Quedgeley. We confirm it runs correctly on new diesel before we go. The whole job is done where your car is, so it never needs to go to a garage. Insurers want a VAT invoice and an engineer report, and both come at the end. ## About Quedgeley Quedgeley is a locality situated near Gloucester in Gloucestershire, with Quedgeley being close to the River Severn and having a relatively low elevation of 19 metres. Quedgeley sits in a predominantly inland area, with nearby places including Hardwicke and Lower Rea. Quedgeley has a population of around 3419 people, with semi-detached housing being the predominant type of accommodation. ## AdBlue drains across Gloucestershire, Quedgeley included Throughout the GL postcode area, the teams taking AdBlue call-outs in Quedgeley reach most of Gloucestershire as well, Hardwicke, Lower Rea and Four Mile Elm among them. If you are close to a boundary, or somewhere hard to explain, ring and ask rather than assuming. Anywhere the car stands — a drive at home, a side street, a car park, a forecourt — we drain it on the spot, and there's no need to bring it to us; which suits Quedgeley, a small village, well. ## What does AdBlue in a diesel tank cost to sort out in Quedgeley? Since the jobs vary, a single figure would not be honest. Three things shift the cost: whether your engine has run and for how long, how much AdBlue got in, and where the car is. That last one turns on whether a technician can reach it safely, and an open drive is simpler than a tight space behind Quedgeley Village Hall. Which fluid went in, how much, plus if the engine ran: every Quedgeley enquiry opens by asking exactly that, ahead of a figure, not after. The replies turn a range into a straight quote. Priced on the call before the engineer heads out, the job is paid for on the day — card or phone, nothing in advance. Look at your insurance while we are on the way: plenty carry misfuelling cover. ## Quedgeley: still beside the vehicle? Then, the best thing to do with your car is to leave it. Keys out; engine and ignition off. Call 0333 366 0103: AdBlue, roughly how much, and whether it ran is all our technicians need. Petrol in Diesel handles the rest across Gloucestershire, Quedgeley included.