--- title: Explained: AdBlue in a Diesel Tank Rivermead canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/rivermead-wiltshire/ location: Rivermead county: Wiltshire latitude: 51.566600 longitude: -1.825530 service: AdBlue in a Diesel Tank updated: 2026-10-18 --- # AdBlue in a Diesel Tank in Rivermead: How It Occurs and How to Stop It Keep your motor and ignition off and phone 0333 366 0103 now — reading can wait if AdBlue is already in the diesel tank. Around Rivermead, finding it before your engine runs normally means a drain and a thorough flush where it stands. Reading before the event? In that case what follows covers how it happens and what to prevent it ever happening. ## AdBlue in a diesel motor: two tanks, two fillers Many modern diesels on the roads about Rivermead and Hillmead carry two liquids, not one. Diesel goes to the motor. Kept in a tank of its own, AdBlue is sprayed into your exhaust stream and cleans it. Separate tanks, separate fillers. Plenty of motors have a single flap for the two, while some move the AdBlue filler to your boot or under the bonnet. The diesel side is filled at the petrol pump all the time. Seldom topped up, AdBlue normally comes from a bottle, tipped by a driver who must stop and think what filler it needs. It is in that gap that the mistake happens. ## How does AdBlue in the diesel tank occur around Rivermead? It is hardly ever carelessness. Three things tend to line up. Hurry follows from the warning. The car tells you as AdBlue runs low, and a dry tank puts the vehicle into limp mode — so the top-up happens quickly, before work on a drive off Mead Way, or heading home in the car park outside The Village Inn. The old car's cap is where your hand reaches — but a rental car, a new vehicle or a company car puts the fillers elsewhere. That's a second factor: a new vehicle. A spouted bottle finds no resistance at a diesel filler any more than at an AdBlue one. And so the tip, once begun, keeps on. Westlea or the heart of Rivermead: it is the same few seconds either way. ## The AdBlue filler and the diesel filler: telling them apart Look at these before pouring, at a forecourt in Rivermead or a driveway out in Wild Duck Mead. A few seconds, no more. - Position can mislead; the cap doesn't. AdBlue caps tend to be blue or carry the name "AdBlue" — diesel caps normally don't. - The size. On plenty of vehicles the AdBlue filler neck is the smaller of the two. - A label inside your fuel flap often shows which fuel goes where, on plenty of vehicles. Check for it. - In the boot or under the bonnet: that's where your filler is if it is not by your diesel cap, and the handbook tells you which. - Picking up a hire or company car, perhaps at the car park outside Swindon? Check with whoever drove the vehicle last before leaving, rather than once the light goes on. ## Keeping AdBlue out of your diesel tank when you top up Wherever across Wiltshire the light comes on, here is a routine for that day. - Pull in on level, motor off, with time in hand — never rushing on the side of Shaw Road. - Find the AdBlue filler, read the cap, and say the word "AdBlue" aloud as unscrewing it. It sounds daft. It works. - The diesel cap remains on. When both share a flap, confirm it's closed before the bottle comes up. - Using the bottle's own spout, tip slowly — and stop when it is full or the bottle is empty. - Only then, start the car: close the cap, check once more, and make sure your diesel cap was never opened. Find at the second or third stage that AdBlue went in the diesel tank? That is where you stop. Leave out stage five altogether. ## Rivermead: already put AdBlue in your diesel tank? Then the order of things is short. Do not start the motor. The fuel pump starts on many diesels the moment the ignition is switched on — and 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 your fuel is pulled from. If you're on a forecourt, whether it is the Shell or the Asda, ask the attendants to help push the car away from the pump. Leave it where it is if you are on your own drive in Rivermead. Already run? Stop when it's sensible, then switch off. On the M4, under 3 miles from Rivermead, that means the next exit. A short hop across Rivermead is a smaller job than a run towards Bath, under 50 miles away, and so tell us roughly how far it went. ## Rivermead: what takes place when our engineers get there Our technicians come to your car wherever it has stopped, whether that is outside Shaw Ridge Primary School, near Swindon Lagoons or on your own driveway. Our technicians ask what was put in, about how much, and if it has run, since those answers settle this work and the quote. Nobody heads out before you've had the quote by phone. Then that tank is emptied and the fuel system flushed thoroughly. Unlike petrol, AdBlue leaves crystals and attacks certain fuel-system metals, and none of that clears away unaided. Hence it counts more. The filter cleaned or, if needed, swapped; fresh diesel in; then a test of your car. The motor is fired up next and checked to make sure it runs correctly, all before we leave. If the engine has not run, most jobs take about half an hour once we are there, using pumps that are fine on a working forecourt and quiet enough to use outside a house after dark. Your insurer usually wants the engineer's report and the VAT invoice, and both are yours once the job is done. Payment is on the day, with no deposit. Plenty of insurance policies include misfuelling cover, and so it is worth checking yours while we're on the way. ## About Rivermead, for a moment Rivermead is a suburban area in Wiltshire, situated on the riverside at an elevation of around 100 metres. Rivermead lies within the wider area of residential development near the city of Bath, and is part of a network of similar suburban areas including Westlea, Eastleaze, and Westmead. Rivermead is characterized by its predominantly detached housing stock, reflecting its relatively affluent demographic. Rivermead is also relatively close to major urban centres, with London approximately 73 miles to the east. ## AdBlue drains in Rivermead and across Wiltshire As a residential suburb, Rivermead has the same vans as surrounding places — Eastleaze, Westmead — right through SN postcodes and the wider area around them. A postcode starting SN5 7 gets the van to you fastest. Shifting the car is not necessary. A drive, a lay-by on the way to Willow Carr, a side street close to How the Mighty Fall: we drain the car where it sits. Tricky to explain, like the back of St. Peter's Catholic Church? By a border? Checking beats guessing, so phone. ## The short version for Rivermead motorists Before you pour, read the cap. If AdBlue has gone in your diesel tank all the same, leave the vehicle off and ring 0333 366 0103. Petrol in Diesel drains it where it stands, anywhere in Wiltshire.