--- title: Highfield: AdBlue in a Diesel Tank, Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/highfield-hampshire/ location: Highfield county: Hampshire latitude: 50.932070 longitude: -1.395190 service: AdBlue in a Diesel Tank updated: 2026-10-03 --- # Avoiding AdBlue in a Diesel Tank in Highfield: Why It Occurs Leave the engine and ignition off and phone 0333 366 0103 first — reading can wait when AdBlue is already in the diesel tank. In Highfield, catching it before the engine turns normally means a drain and a full flush on the spot. Here in advance? Then what follows covers how it comes about and how to prevent it happening at all. ## Two fillers, two tanks: AdBlue in a diesel motor Diesel feeds your motor — but many newer diesels seen around Highfield and St Denys hold another fluid as well. AdBlue goes to the exhaust, where it is sprayed into the gas to fresh it, and it lives in a tank of its own. Each tank has one filler of its own. Many of cars have a single flap for the two, while some put the AdBlue filler to your boot or under the bonnet. Topping up the diesel side at the pump goes on all the time. Seldom topped up, AdBlue normally comes out of a bottle, tipped by someone who must stop and think what filler to use. It's in that gap that the slip happens. ## AdBlue in the diesel tank around Highfield: how it occurs Rarely is it carelessness: normally three things line up. Haste comes from the warning. Your car tells you as AdBlue runs low, and a dry tank sends the vehicle into limp mode — so the top-up happens quickly, before work on a drive off Welbeck Avenue, or heading home in the car park outside Brewhouse & Kitchen (Southampton). Then your car is strange. A hire car, a new motor or a company car puts the fillers where your last one did not, and your hand reaches for the cap it would have used on the old one. 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 after it has started. It's seconds, be it in Portswood or bang in the heart of Highfield. ## How to tell the AdBlue filler from the diesel one Before you pour anything, whether on a driveway in Bevois Valley or a forecourt in Highfield, check these. They take a couple of seconds. - Position can mislead; the cap doesn't. AdBlue ones tend to be blue or bear the word "AdBlue" — diesel caps normally don't. - On many motors, the size gives it away: AdBlue has the smaller filler neck. - A label inside your fuel flap frequently says which fuel goes where, on plenty of cars. Check for it. - In your boot or under the bonnet: that's where your filler sits if it's not by your diesel cap, and the handbook says which. - Collecting a hire or company car, say at the car park outside St Denys? Ask whoever drove the car last before leaving, not once the light comes on. ## Keeping AdBlue out of your diesel tank when you top up When the light goes on, wherever in Hampshire, follow this routine. - Not in a rush on the side of University Road, not on a slope, not with your motor running: park then switch off first. - Silly as it sounds, saying "AdBlue" aloud while you unscrew the cap does the trick — after you have found the filler and read the cap. - The two behind a single flap? So confirm the lid on the diesel filler is still shut before lifting the bottle. - Slowly does it, through the bottle's own spout, till it's full or the bottle is empty. - Before you start your car, shut the cap and look a second time that the diesel cap was never opened off. Stop there if you find, at step two or three, that you've already poured into the diesel side. Stage five stays off limits. ## Already put AdBlue in your diesel tank in Highfield? Then the order of things is short. Do not start your engine. On plenty of diesels your ignition alone runs the fuel pump, so don't switch it on. Thinning it with extra diesel fails, since AdBlue sinks to the bottom rather than blending — and that's where the fuel is drawn from. If you are at a forecourt, whether it's the Esso or the Shell, ask the attendants to help push the car clear of the pump. Your own driveway around Highfield is where it stays. Stop as soon as it is safe then switch off, if your engine has already run. The next exit is where to leave when you're on the M27, under 3 miles from Highfield. Mileage counts — a quick hop across Highfield makes a smaller job than heading under 3 miles towards Southampton — so tell us about how far it went. ## What takes place when we turn up in Highfield Our engineers come to the vehicle wherever it has stopped, whether that's outside Highfield Church of England Primary School, near Zebraversity or on your own driveway. Both the work and the quote rest on three replies — what liquid, which amount, and whether it's run — so we ask. You get that quote by phone, before anybody heads out. Draining that tank comes next, followed by a thorough flush of the fuel system. AdBlue crystallises and is corrosive to some of the metals in a fuel system, and so it does not wash out on its own — which is why the flush matters more with AdBlue than with petrol. After the filter has been flushed — or renewed, where needed — fresh diesel is added, and then your car gets tested. After that we start the car and make sure it runs correctly before we go. Using pumps safe on a working forecourt and quiet enough for use outside a house at night, most jobs where the engine hasn't run take about half an hour after our technicians arrive. No money in advance; you settle up that day. At the end, a VAT invoice and a report from the engineer are handed to you for your insurer. Misfuelling cover is included in many insurance policies — and so use the wait to look at yours. ## About Highfield and where it is Highfield is a suburban area located near the coast in Hampshire, sitting at an elevation of around 35 metres and approximately 1.9 miles from Southampton. Highfield is characterized by its predominantly semi-detached housing stock and is situated near other residential areas such as Portswood and Westwood Park. Highfield forms part of the larger Southampton urban area, with the city centre and its amenities within easy reach. Highfield is also relatively close to other local parks and green spaces, including Hampton Park. ## AdBlue drains across Hampshire, Highfield included As a residential suburb, Highfield has the same vans as surrounding places — Westwood Park, Hampton Park — right through SO postcodes and the wider area beyond. Our van reaches you fastest with a postcode starting SO17 1. The car does not need to move. The drain happens on the spot, whether a driveway, a road by Jubilee Sports Complex, or a lay-by towards Glebe Copse. If you are near a border, or somewhere hard to describe like the back of Nth, ring and ask rather than assuming. ## For Highfield drivers, the short version Before you pour, read the cap. Even so AdBlue in the diesel tank? Petrol in Diesel will empty it wherever it stands, anywhere in Hampshire: keep it off and call 0333 366 0103.