--- title: AdBlue in a Diesel Tank Waterside: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/waterside-cambridgeshire/ location: Waterside county: Cambridgeshire latitude: 52.349530 longitude: 0.419030 service: AdBlue in a Diesel Tank updated: 2026-10-05 --- # Why It Happens and How to Avoid It: AdBlue in a Diesel Tank in Waterside AdBlue already in the diesel tank? In that case set this page down for now, leave the ignition and engine off, then call 0333 366 0103. A drain and a full flush, carried out right where your car sits in Waterside, is normally all it needs if found before the motor runs. If you are reading before it has happened, the rest of this page is about why it occurs and how to make sure it doesn't. ## AdBlue in a diesel vehicle: two tanks, two fillers Many modern diesels on the roads round Waterside and West Row carry two liquids, not one. Diesel goes to the engine. Its own tank keeps it, and from there it goes to your exhaust, where a spray treats the gas. Each tank has its own filler. On a lot of motors the two sit side by side under the same flap; on others the AdBlue filler is in your boot or under the bonnet. The diesel side is topped up at the pump all the time. A driver who has to stop and work out where it goes usually fills the AdBlue side, from a bottle, and much less frequently. The mistake lives in that gap. ## How does AdBlue in the diesel tank occur in Waterside? Carelessness seldom explains it. What does is three things coming up at once. The warning comes first. As AdBlue runs low your car tells you, and if it runs out altogether, the car drops into limp mode. So the top-up is done in a hurry: on a drive off Waterside before work, or in the car park at Rising Sun on the way home. Then, your hand goes for the cap it would have used on the old motor — since a rental car, a new car or a company car puts the fillers somewhere 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 tip once it has started. The same few seconds decide it, in the middle of Waterside or out in East End. ## How to tell the AdBlue filler from the diesel one Before you tip anything, whether on a driveway in Thistley Green or a forecourt in Waterside, check these. They take a few seconds. - Check the cap rather than going by where it sits: AdBlue ones are regularly blue or marked "AdBlue", and diesel ones usually aren't. - On many vehicles, size tells: AdBlue has the smaller filler neck. - Check inside your fuel flap: many vehicles carry a label there showing which fuel goes where. - Cannot see it next to the diesel inlet? In that case check beneath the bonnet or in the boot — the handbook says where. - Whoever had it before will know. Ask as you pick up a hire car or company car — from Soham's car park, say — not once the light appears. ## AdBlue top-ups that never reach your diesel tank A routine for the day the light comes on, wherever around Cambridgeshire that is. - Not in a rush on the side of Sandpiper, not on a slope, not with the motor running: park then switch off first. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds silly and it does the trick. - The two behind one flap? Then make sure the lid on the diesel filler is still shut ahead of lifting the bottle. - Slowly does it, through the bottle's own spout, till it is full or the bottle runs out. - Only after that, start your car: close the cap, check once more, and make sure the diesel cap was never opened. If at stage two or three you find you have already poured into your diesel side, stop there. Stage five stays off limits. ## AdBlue in the diesel tank already, in Waterside? What follows is a short order of things, beginning with no starting your engine. Do not switch your ignition on; on plenty of diesels that alone runs the fuel pump. AdBlue does not mix with diesel — it sinks to the bottom of your tank, where the fuel is pulled from — so don't top up with diesel to dilute it. On a forecourt — Express with Gas, Pace or any other — the staff will normally help push your car away, if you ask. Your own driveway around Waterside is where it should stay. When the engine has run already, stop somewhere safe then switch it off. The next junction means the place to come off if you are on the M11, under 25 miles from Waterside. Tell us about how far it went: a run towards Ely, under 10 miles away, is a bigger job than a short hop across Waterside. ## Waterside: what takes place when our engineers arrive Outside Isleham Church of England Primary School, near High Street Baptist Church or on your own driveway: wherever the car has stopped, our technicians come to it. Our technicians ask what went in, roughly how much, and if it's run, since the answers decide this work and our quote. No one heads out before you've had our quote over the phone. After that: a drain, then a thorough flush of the entire system. AdBlue crystallises and is corrosive to some of the metals in a fuel system, so it does not wash out on its own — which is why the flush counts more with AdBlue than with petrol. The filter is flushed, or replaced where it needs to be; fresh diesel goes in; and the car is tested. Before we leave, we start the car and check that it is running smoothly. Unstarted vehicles mostly need a half-hour job after arrival. The equipment is fine on a busy filling station, and hushed enough for a residential street late at night. You pay on the day, with nothing upfront, and get a VAT invoice and an engineer report for your insurer. Misfuelling cover is part of many insurance policies — and so use the wait to check yours. ## About Waterside itself Waterside is a small suburban area in Cambridgeshire, situated on the riverside with an elevation of around 6 metres. Waterside lies near the city of Ely, approximately 7.5 miles away, and is also close to other nearby places such as East End, Isleham, and Little London. Waterside has a population of around 670 people and is characterised by predominantly detached housing. ## AdBlue drains across Cambridgeshire, Waterside included Isleham and Little London are among the towns around Waterside, a residential suburb, that the same teams cover, over CB postcodes. Our van reaches you fastest with a postcode starting CB7 5. The vehicle doesn't need to shift. Anywhere it stands — near Pound Lane Free Church, on a lay-by heading to Isleham Recreation Ground, at home — that's where it gets emptied. Tricky to explain, like the back of Saint Andrew, (Isleham Parish Church)? Close to a border? Asking beats assuming, so ring. ## Waterside motorists: the short version Tip nothing till you have read the cap. If AdBlue has gone in your diesel tank anyway, leave the vehicle off then phone 0333 366 0103. Petrol in Diesel clears it where it stands, anywhere around Cambridgeshire.