--- title: AdBlue in a Diesel Tank Farncombe? Read This canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/farncombe-surrey/ location: Farncombe county: Surrey latitude: 51.196180 longitude: -0.604380 service: AdBlue in a Diesel Tank updated: 2026-10-24 --- # Why It Occurs and How to Prevent It: AdBlue in a Diesel Tank in Farncombe Leave your motor and ignition off and phone 0333 366 0103 now — reading can wait if AdBlue is already in your diesel tank. Usually, when the engine hasn't run, it's drained and fully flushed where your car is in Farncombe. Not happened yet? Below, the page explains the reasons it takes place and the how to prevent it altogether. ## Two fillers, two tanks: AdBlue in a diesel vehicle Many current diesels on the roads around Farncombe and Godalming carry two liquids, not one. Diesel goes to the engine. AdBlue's own tank holds it, and from there it goes to the exhaust, and there spraying treats the fumes. Separate tanks, separate fillers. On a lot of cars the two sit side by side under the same flap; on others the AdBlue filler is in your boot or under the bonnet. Diesel gets filled on every filling station visit, week in, week out. Much less regularly, the AdBlue side is topped up — normally from a bottle, by a person working out where it goes. That gap is where the error lives. ## How does AdBlue in your diesel tank happen around Farncombe? Three things tend to line up, and carelessness is seldom one of them. First, the warning. Low AdBlue triggers a message from the car, and letting it run out leads to limp mode — so a hurried top-up, perhaps before work off Farncombe Street, or at The Cricketers on the way home after work. Unfamiliar motors are second, as well. Hire cars, new cars and company cars put their fillers in new places, and habit goes for the cap 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, so nothing stops the tip once it has started. The same few seconds settle it, in the middle of Farncombe or out in Frith Hill. ## Which filler is for AdBlue, and which for diesel? A few seconds is all the checks take — so check them before you pour anything, on a drive in Westbrook or a forecourt in Farncombe. - The cap. The AdBlue cap is often blue, or marked "AdBlue". The diesel cap normally isn't. Read it rather than going by position. - Plenty of cars fit AdBlue the smaller neck of the two. - Look inside your fuel flap: plenty of vehicles carry a label there saying which fuel goes where. - The handbook. If the filler isn't by the diesel cap, it's in your boot or under the bonnet, and the handbook says which. - Picking up a hire or company car, say at the car park at the nearest station? Check with whoever drove it last before leaving, rather than when the light comes on. ## AdBlue top-ups that never reach your diesel tank Anywhere around Surrey the light comes on, this is a routine for the day. - Turn off once parked — level ground, engine off, and never in a rush beside Saint John's Street on the verge. - Find the AdBlue filler, check the cap, and speak the name "AdBlue" aloud as you unscrew it. It sounds silly. It does the trick. - The diesel cap stays on. Where the two share a flap, confirm it's closed before lifting the bottle. - Finish when the tank fills or the bottle runs dry; until then, tip gently using the own spout. - Only then, start your car: close the cap, check again, and make sure your diesel cap was never opened. Spot at stage two or three that it's already gone into your diesel side? So stop just there. Leave out step five altogether. ## Put AdBlue in your diesel tank in Farncombe already? Don't start your motor: that's how the short order of things starts. On many diesels your ignition alone runs the fuel pump, and so don't switch the vehicle on. Don't top up with diesel to thin it: AdBlue does not mix with diesel, it sinks to the bottom of that tank, where the fuel is drawn from. At a forecourt — Texaco, Sainsbury's or any other — the staff will normally help roll your car clear, if you ask. If you are on your own drive around Farncombe, leave it where it is. When the engine has run already, pull over somewhere safe and turn it off. Leave the M3 — under 15 miles out of Farncombe — at the next junction. Distance counts — a short hop across Farncombe is a smaller job than driving under 50 miles to Chichester — so tell us roughly how far it went. ## What occurs when our technicians turn up around Farncombe Anywhere the car has stopped, whether outside Farncombe Church of England Infant School, near St John the Evangelist Church or on your own drive, our van travels to it. Those replies determine the work and the quote, so we ask what went in, about how much, and whether it has run. You hear that price by phone, before anybody sets off. Then your tank is emptied and your system cleaned thoroughly. More than with petrol, it matters with AdBlue: crystals form, some metals corrode, and nothing clears away on its own, no matter how long it is left. The filter flushed or, if needed, swapped; clean diesel in; and then a test of the vehicle. Next our technicians start the engine and make sure it runs correctly before we leave. With pumps fine on a working forecourt and quiet enough for use outside a house at night, most jobs in which your motor hasn't run take roughly half an hour after our engineers arrive. The insurer will ask for the engineer's report and the VAT invoice, and you get both at the end. Payment is on the day, with no money upfront. Many insurance policies include misfuelling cover, and so it is worth checking yours while we are on the way. ## About Farncombe and where it is Farncombe is a village situated on the riverside in Surrey, with an elevation of 44 metres above sea level. Farncombe lies near the towns of Godalming and Guildford, and is surrounded by nearby places such as Frith Hill, Catteshall, and Binscombe. Farncombe has a population of approximately 4234 residents, who mostly reside in semi-detached housing. Farncombe is located 29.8 miles from London, making it a commuter-friendly village. ## Farncombe and Surrey: AdBlue drains across the area As a village, Farncombe shares its vans nearby areas — Catteshall, Binscombe — all the way through GU postcodes and the surrounding area around them. The van gets to you fastest with a postcode starting GU7 3. There's no need to move your car. Anywhere it sits — beside Aquarius, in a layby heading to Broadwater Park, at home — that's where it is cleared. If you're near a border, or somewhere hard to describe like the back of St John Street Hall, ring and ask rather than assuming. ## The short version for Farncombe motorists Read the cap before you pour. Still AdBlue in your diesel tank? Petrol in Diesel can empty it where it stands, anywhere in Surrey: switch it off then ring 0333 366 0103.