--- title: St Pauls Cray: AdBlue in a Diesel Tank, Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/st-pauls-cray-greater-london/ location: St Pauls Cray county: Greater London latitude: 51.404600 longitude: 0.103930 service: AdBlue in a Diesel Tank updated: 2026-10-04 --- # AdBlue in a Diesel Tank in St Pauls Cray: How It Happens and How to Stop It Pause here for a moment if the diesel tank already has AdBlue in it: ignition off, engine off, and ring 0333 366 0103. Around St Pauls Cray, finding it before your motor runs normally leaves a drain and a thorough flush on the spot. If you're reading before it has happened, the remainder of this page is about why it happens and how to make sure it does not. ## AdBlue in a diesel car, and its separate tank Diesel goes to your motor — yet plenty of newer diesels driven round St Pauls Cray and St Mary Cray hold a second liquid as well. Stored in a tank of its own, AdBlue is fed into your exhaust stream to clean it. There's a filler for every tank. Under one flap, next to each other: that is the arrangement on a lot of cars. On others, AdBlue's filler is beneath the bonnet or in the boot instead. At the pump, the diesel side is topped up all the time. The AdBlue side is fuelled far less often, normally from a bottle, and normally by a person who has to stop and think where it goes. It is in the gap that the error lives. ## AdBlue in your diesel tank around St Pauls Cray: how it takes place Three things tend to come together, and carelessness is rarely one of them. The warning comes first. As AdBlue runs low the car tells you, and if it runs out completely, the car goes into limp mode. So the top-up is done in a hurry: on a driveway off Cotmandene Crescent before work, or in the car park at The Bull Inn on the way home. Next, the hand reaches for the cap it would have used on the old motor — since a hire car, a new vehicle or a company car places the fillers where your last one didn't. And the bottle fits. A bottle with a spout goes into a diesel filler as easily as an AdBlue one, and so nothing stops the pour after it has started. It's seconds, be it in Poverest or right in the heart of St Pauls Cray. ## The AdBlue filler and your diesel filler: telling them apart Before you pour anything, whether on a driveway in Albany Park or a forecourt around St Pauls Cray, check these. They take a couple of seconds. - The cap. The AdBlue cap is regularly blue, or marked "AdBlue". The diesel cap normally is not. Read it rather than going by where it sits. - The size. On many cars the AdBlue filler neck is the smaller of the two. - Check inside the fuel flap: plenty of motors have a label there saying which fuel goes where. - In the boot or under the bonnet: that is where the filler sits 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 — when you pick up a hire or company car from somewhere like the car park at St Mary Cray. ## Keeping AdBlue out of the diesel tank when you top up Anywhere in Greater London the light comes on, this is a routine for the day. - Switch off after you park — level ground, engine stopped, and not rushed beside Chipperfield Road on the verge. - Silly as it sounds, saying "AdBlue" aloud while you unscrew the cap works — once you have located the filler and read the cap. - Both under a single flap? Then confirm the cap on the diesel side is still shut ahead of lifting the bottle. - Tip slowly, using the bottle's own spout. Stop when it is full or when the bottle is empty. - Only after that, start the car: close the cap, check a second time, and make sure the diesel cap was never opened. Discover at the second or third stage that the bottle went into the wrong tank? That is where you stop. Leave out step five altogether. ## St Pauls Cray: already put AdBlue in your diesel tank? Do not start your engine: that is how the short order of things starts. On plenty of diesels your ignition alone runs the fuel pump, and so do not switch it on. Topping up with diesel won't dilute it: instead, AdBlue sinks to the bottom of your tank, right where the fuel is drawn from. If you are on a forecourt, whether it is the JET or the Tesco Express, ask the staff to help push the car clear of the petrol pump. On your own drive around St Pauls Cray? Then the vehicle remains put. Already started? Pull over when it's safe, then turn off. On the M20, under 5 miles from St Pauls Cray, that means the next exit. Mileage counts — a quick hop across St Pauls Cray is a smaller job than driving under 15 miles to London — so say roughly how far it went. ## When our engineers arrive around St Pauls Cray, what happens? Our engineers come to your car wherever it has stopped, whether that's outside Gray's Farm Primary Academy, near St Paul’s Cray Community Support Centre or on your own driveway. Those answers decide the work and the price, and so our technicians ask what was put in, roughly how much, and whether it has run. No one heads out until you have had the quote over the phone. Then that tank is emptied and your system cleaned thoroughly. Much more than with petrol, it counts with AdBlue: crystals form, some metals are attacked, and none of that washes out unaided, no matter how long it is left. Filter flushed or, if it must be, swapped; clean diesel in; and then a test of the vehicle. The motor is started next and tested to make sure it runs correctly, all before we head off. Using pumps safe on a working forecourt and quiet enough to use outside a house at night, most jobs where your motor hasn't run need roughly half an hour once our engineers arrive. No money in advance; you settle up on the day. At the end, the VAT invoice and a report from the engineer go to you for your insurer. Wrong-fuel cover is part of many insurance policies — so make use of the wait to look at yours. ## About St Pauls Cray and where it is St Pauls Cray is a suburban area in south-east London, situated approximately 12 miles from central London. St Pauls Cray has a mix of semi-detached housing and other residential properties, and is located near the suburbs of Poverest, Ruxley, and Foots Cray. St Pauls Cray sits at an elevation of around 56 metres, in a gently sloping area of the London Basin. ## AdBlue drains across Greater London, St Pauls Cray included Throughout BR postcodes, the vans that cover St Pauls Cray — a residential suburb — work the nearby spots too, Foots Cray and Ruxley among them. Our van reaches you fastest with a postcode starting BR5 2. Shifting the car isn't necessary. We drain it where it is — a side street close to St Paul's Cray Library, a lay-by on the way to Hoblingwell Wood Recreational Ground, a drive. Guessing doesn't help at the back of Cotmandene Community Resouce Centre, close to a boundary, or anywhere hard to pin down; ring and ask. ## St Pauls Cray people: the short version Read the cap before you tip. Petrol in Diesel drains it on the spot, anywhere across Greater London, if AdBlue has gone in your diesel tank regardless — so leave it off then ring 0333 366 0103.