--- title: Portslade-by-Sea: AdBlue in a Diesel Tank, Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/portslade-by-sea-east-sussex/ location: Portslade-by-Sea county: East Sussex latitude: 50.843130 longitude: -0.220120 service: AdBlue in a Diesel Tank updated: 2026-10-04 --- # Portslade-by-Sea: How Does AdBlue End Up in a Diesel Tank, and How Do You Avoid It? If AdBlue is already in your diesel tank, stop reading for a moment: leave the motor and your ignition off then call 0333 366 0103. In Portslade-by-Sea, catching it before the motor runs normally means draining and a full flush on the spot. The rest of this page covers why it takes place and how to make sure it does not — useful if you're reading ahead of time. ## Two fillers, two tanks: AdBlue in a diesel motor Plenty of modern diesels on the roads about Portslade-by-Sea and Hangleton carry two liquids, not one. Diesel goes to your engine. The exhaust, not your motor, is where AdBlue ends up: dosed into the gas to clean them, from its own tank. Separate tanks, separate fillers. Some cars keep the AdBlue filler in your boot or under the bonnet; plenty of others place both side by side behind one flap. Topping up the diesel side at the pump happens constantly. The AdBlue side is topped up far less frequently, normally from a bottle, and normally by someone who has to stop and think where it goes. It's in the gap that the slip lives. ## How does AdBlue in the diesel tank happen around Portslade-by-Sea? Rarely is it carelessness: usually three things line up. To start with, the warning. Low AdBlue triggers a warning from the car, and letting it run out means limp mode — so a hurried top-up, maybe before work off High Street, or outside The Stags Head on the way home that evening. The old car's cap is where the hand goes — yet a rental car, a new motor or a company car keeps the fillers elsewhere. That's the second factor: a strange vehicle. No part halts the pour after it has started, since a bottle with a spout goes into a diesel filler as easily as an AdBlue one. The bottle fits. It takes seconds, be it in Portslade Village or bang in the centre of Portslade-by-Sea. ## Telling the AdBlue filler from the diesel filler Check these first, on a forecourt in Portslade-by-Sea or a drive out in Southwick. Seconds, no more. - Read the cap rather than going by position: AdBlue caps are often blue or marked "AdBlue", and diesel ones usually aren't. - On many cars, the size tells: AdBlue gets the smaller filler neck. - The flap. Look inside the fuel flap for a label. Plenty of vehicles say there which fuel goes where. - The handbook says which it is if the filler is not next to your diesel cap: your boot, or under the bonnet. - The person who drove it last. On a hire or company car picked up from somewhere like the car park outside Fishersgate, ask before you leave, not when the light comes on. ## How to top up without AdBlue in your diesel tank The day the light comes on, wherever across East Sussex, use this routine. - Pull in on level, engine off, with time to spare — never hurried on the side of South Street. - Daft as it sounds, speaking "AdBlue" out loud as you unscrew the cap works — once you've found the filler and read the cap. - Both under a single flap? Then confirm the lid on the diesel side stays shut ahead of raising the bottle. - Stop when your tank fills or the bottle runs dry; before that, pour gently through the own spout. - Close the cap, and look once more — confirm the diesel filler remained closed throughout. Only then, start your car. Stop there if you find, at step two or three, that you have already poured into your diesel side. Skip stage five altogether. ## Portslade-by-Sea: already put AdBlue in your diesel tank? Brief order, then. Top of it: the motor remains off. The fuel pump starts on many diesels as soon as the ignition goes on — so keep it off. Don't top up with diesel to thin it: AdBlue does not mix with diesel, it sinks to the bottom of your tank, where the fuel is pulled from. The staff at Texaco, Sainsbury's or another forecourt will normally lend a hand to push the vehicle away when asked. Leave it where it is if you are on your own driveway in Portslade-by-Sea. If your motor has already run, stop as soon as it is safe then switch off. Portslade-by-Sea lies under 25 miles from the M23; there, use the next exit. About how far did it go? Crossing Portslade-by-Sea is smaller a job than a trip of under 5 miles towards Brighton and Hove, so say. ## What happens when our technicians turn up in Portslade-by-Sea Wherever the vehicle came to rest, whether by Peter Gladwin Primary School, near South Street Studio or at home, our van comes to it. Those replies decide this work and the quote, and so our technicians ask what got in, about how much, and whether it has run. On the call itself, you are told our quote — ahead of anything else. Emptying that tank comes next, followed by a full flush of the fuel system. Much more than with petrol, it counts with AdBlue: crystals form, some metals are attacked, and none of that clears out on its own, no matter how long it is left. Once your filter is flushed — or renewed, where needed — clean diesel is added, and finally the car gets tested. After that our engineers fire it up and confirm it runs correctly before we go. If your engine hasn't run, the majority of jobs take about half an hour once we are there, using pumps that are safe on a working forecourt and quiet enough to use outside a house after dark. No money upfront; you settle up that day. Afterwards, a VAT invoice and a report from the engineer are handed to you for the insurer. Wrong-fuel cover is part of many insurance policies — so make use of the wait to check yours. ## About Portslade-by-Sea, for a moment Portslade-by-Sea is a coastal locality in East Sussex, situated near the city of Brighton and Hove. Portslade-by-Sea has a population of around 3899 people and is characterised by semi-detached housing. Portslade-by-Sea is close to nearby places such as Portslade Village, Southern Cross, and Mile Oak, and is approximately 46 miles from London. Portslade-by-Sea sits at an elevation of 25 metres above sea level, overlooking the English Channel. ## Portslade-by-Sea and East Sussex: AdBlue drains across the area Portslade-by-Sea is a coastal area, and the teams that cover it also work the towns near it, Southern Cross and Mile Oak among them, across the BN postcode area. Our van reaches you fastest with a postcode starting BN41 2. The car does not need to shift. We drain it where it is — a side street close to St Nicholas', a lay-by on the way to Portslade Old Village Green, a driveway. Ring and ask instead of guessing if you are close to a border, or somewhere hard to explain, like the back of Portslade Baptist Church. ## For Portslade-by-Sea people, the short version Read the cap before you pour. AdBlue in your diesel tank after all? Leave the car switched off then phone 0333 366 0103; Petrol in Diesel drains it where it stands, throughout East Sussex.