--- title: Explained: AdBlue in a Diesel Tank Farleigh canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/farleigh-somerset/ location: Farleigh county: Somerset latitude: 51.417630 longitude: -2.726830 service: AdBlue in a Diesel Tank updated: 2026-10-21 --- # AdBlue in a Diesel Tank in Farleigh: How It Occurs and How to Prevent It Pause here for a moment when your diesel tank already has AdBlue in it: ignition off, engine off, and ring 0333 366 0103. Normally, when your engine hasn't run, it's drained and thoroughly purged where the vehicle sits in Farleigh. Not happened yet? Below, the page covers the why it occurs and the ways to avoid it altogether. ## Why does AdBlue in a diesel motor need its own filler? Many current diesels on the roads round Farleigh and Backwell Common carry two liquids, not one. Diesel goes to your motor. Your exhaust, not the motor, is where AdBlue ends up: dosed into the gas to clean them, from its own tank. There is a filler on each tank. Under one flap, side by side: that is the arrangement on many motors. On others, AdBlue's filler is beneath the bonnet or in the boot instead. The diesel side is topped up at the pump all the time. Seldom filled, AdBlue normally goes in out of a bottle, poured by someone who must stop and think which cap to use. Mistakes happen in the gap between the two. ## How AdBlue in the diesel tank happens around Farleigh Seldom is it carelessness: usually three things coincide. On a driveway off Uncombe Close before work, or in the car park outside The George heading home: that's where the hurried top-up takes place. Why the rush? As AdBlue gets low the vehicle warns you, and if it is gone, limp mode follows. New-to-you motors come second, too. Hire cars, new cars and company motors place their fillers differently, and the hand goes for the cap used on the old one. Nothing halts the tip once it has started, because a bottle with a spout goes into a diesel filler as easily as an AdBlue one. The bottle fits. Backwell Green or the heart of Farleigh: it is the same few seconds either way. ## Which filler is for AdBlue, and which for diesel? Before you tip anything, whether on a driveway in Flax Bourton or a forecourt in Farleigh, check these. They take a few seconds. - Read the cap rather than going by position: AdBlue caps are regularly blue or marked "AdBlue", and diesel caps usually are not. - Plenty of motors give AdBlue the smaller neck of the two. - The flap. Look inside the fuel flap for a label. Plenty of motors say there which fuel goes where. - The handbook. If the filler is not by the diesel cap, it's in your boot or under the bonnet, and the handbook says which. - Ask the person who drove it last — before you leave, not when the light comes on — when you collect a hire or company car from somewhere like the car park at Nailsea & Backwell. ## Keeping AdBlue out of the diesel tank when you top up The day the light goes on, wherever in Somerset, use this routine. - Switch off after you park — flat ground, motor stopped, and not in a rush beside Farleigh Road at the roadside. - Daft as it sounds, speaking "AdBlue" aloud while you unscrew the cap does the trick — after you've found your filler and read it. - The diesel cap remains on. When the two sit under a flap, make sure it's shut before the bottle comes up. - Stop when the tank is topped up or the bottle runs dry; until then, pour slowly through the own spout. - Close the cap and check a second time. Make sure your diesel cap was never opened. Only then start your car. Stop there if you find, at step two or three, that you've already poured into the diesel side. Stage five stays off limits. ## Put AdBlue in your diesel tank in Farleigh already? Short list, then. Top of it: the motor remains unstarted. The fuel pump runs on plenty of diesels as soon as the ignition goes on — so leave it off. AdBlue does not mix with diesel — it sinks to the bottom of that tank, where the fuel is pulled from — so don't top up with diesel to thin it. If you are at a forecourt, whether it is the Backwell Motors or the Tesco, ask the attendants to help roll the car clear of the pump. Your own drive around Farleigh is where it stays. If your engine has already run, stop as soon as it is safe then switch off. Come off the M5 — under 5 miles out of Farleigh — at the next exit. Tell us about how far it went: a run towards Bristol, under 10 miles away, is a bigger job than a short hop across Farleigh. ## What happens when our technicians turn up in Farleigh Our van reaches your car anywhere it has come to rest — your own driveway, near Backwell House, or outside Backwell Church of England Junior School. The answers decide the work and our quote, so we ask what was put in, roughly how much, and whether it has run. That price is given over the phone, ahead of any van leaving. Draining that tank comes next, then a thorough flush of your system. Much more than with petrol, it matters here: crystals form, certain metals are attacked, and none of that clears away unaided, no matter how long it sits. After the fuel filter has been cleaned — or replaced, if needed — clean diesel goes in, and finally the car gets tested. Before we go, we start the car and confirm that it is running correctly. With pumps safe on a busy forecourt and quiet enough to use outside a house at night, most jobs in which your engine hasn't run need roughly half an hour after we arrive. You pay on the day, with nothing upfront, and get a VAT invoice and an engineer report for your insurer. It's worth checking your insurance as the van travels to you: misfuelling cover is included with plenty of policies. ## About Farleigh and where it is Farleigh is a small village in Somerset, situated inland at an elevation of 43 metres, approximately 5.9 miles from Bristol. Farleigh has a population of around 574 residents, with predominantly detached housing. Farleigh is close to nearby places such as Backwell Green, Church Town, and Backwell, and is about 112 miles west of London. ## AdBlue drains in Farleigh and across Somerset Over BS postcodes, the teams that cover Farleigh — a rural village — work the nearby locations too, Backwell and Church Town included. Our van reaches you fastest with a postcode starting BS48 3. Your car remains where it is. Our engineers drain it where it is — a side street close to St. Andrew's Church, a lay-by on the way to Cherry Wood, a drive. Assuming won't help behind Backwell Leisure Centre, close to a border, or anywhere awkward to describe; ring and ask. ## Farleigh people: the short version Tip no AdBlue until you have 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 clears it where it waits, anywhere in Somerset.