--- title: AdBlue in a Diesel Tank Grayswood? Read This canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/grayswood-surrey/ location: Grayswood county: Surrey latitude: 51.100900 longitude: -0.688660 service: AdBlue in a Diesel Tank updated: 2026-10-04 --- # Grayswood: How Does AdBlue End Up in a Diesel Tank, and How Do You Prevent It? AdBlue already in the diesel tank? Then put this page down for now, leave the ignition and motor off, and phone 0333 366 0103. A drain plus a full flush, done just where the car stands in Grayswood, is usually all it takes if caught before the engine runs. Not happened yet? Below, the page covers the why it occurs and the ways to avoid it altogether. ## Two fillers, two tanks: AdBlue in a diesel vehicle Not one fluid but two: that's what many modern diesels around Grayswood and Shepherds Hill carry, with diesel for the motor. Kept in a tank of its own, AdBlue is fed into the exhaust gas to clean it. There is a filler on every tank. Plenty of vehicles have a single flap for both, while others put the AdBlue filler to the boot or under the bonnet. At the petrol pump, your diesel side gets filled all the time. Someone who has to stop and work out where it goes normally fills the AdBlue side, from a bottle, and far less commonly. That gap is where the slip lives. ## How does AdBlue in your diesel tank happen around Grayswood? Rarely is it carelessness: usually three things coincide. Hurry comes from the warning. Your car tells you as AdBlue runs low, and a dry tank sends it into limp mode — so the top-up happens quickly, before work on a drive off Upper Mount, or heading home in the car park at The Wheatsheaf Inn. The old car's cap is where the hand goes — but a rental car, a new motor or a company car puts the fillers somewhere else. That's a second factor: a strange vehicle. Lastly, the bottle goes in: diesel filler or AdBlue filler, it goes in as easily, and after the tip begins, no part stops it. The same few seconds settle it, in the middle of Grayswood or out in Almshouse Common. ## Telling the AdBlue filler from your diesel filler Whether a Grayswood forecourt or a drive over in Ramsnest Common, spend a couple of seconds on these before anything is poured in. - The cap. The AdBlue cap is commonly blue, or marked "AdBlue". The diesel cap usually is not. Read it instead of going by position. - Look at the size: the smaller neck is, on many vehicles, the AdBlue one. - Lift the filler flap and check for a label — plenty of motors mark which goes in each inlet just there. - The handbook. If the filler is not by your diesel cap, it is in the boot or under the bonnet, and the handbook says which. - The person who drove the vehicle last. On a hire or company car picked up from somewhere like the car park outside Haslemere, ask before you leave, not when the light comes on. ## How to top up without AdBlue in your diesel tank A routine for the day the light comes on, wherever around Surrey that is. - Stop somewhere level, engine off, with time to spare — not hurried on the side of The Mount. - Locate the AdBlue filler, check the cap, and speak the word "AdBlue" out loud as unscrewing it. It seems daft. It does the trick. - Leave the diesel cap on. If both sit under one flap, check your diesel cap is still closed before you lift the bottle. - Gently is best, through the bottle's own spout, until it's full or the bottle is empty. - Only after that, start your car: close the cap, check once more, and make sure the diesel cap was never opened. Find at step two or three that it's already gone into the diesel side? Then stop just there. Never carry on to step five. ## Grayswood: already put AdBlue in the diesel tank? What follows is a short order of things, starting with not starting your motor. On many diesels your ignition alone runs the fuel pump, so do not 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 your tank, where the fuel is pulled from. The staff at Shell, Asda Express or any forecourt will normally lend a hand pushing the car away when you ask. On your own drive around Grayswood? Then your car stays put. When the motor has run already, stop safely and turn the car off. Grayswood sits under 15 miles from the M3; on it, use the first exit. A short hop across Grayswood is a smaller job than a run towards Chichester, under 25 miles away, so tell us about how far it went. ## Our arrival in Grayswood, and what occurs next Outside Grayswood Church of England (Aided) Primary School, near All Saints or on your own driveway: wherever the car has stopped, we come to it. The answers determine this work and our quote, so our technicians ask what went in, roughly how much, and if it's run. No one heads out before you've had our quote by phone. Then your tank is drained and the fuel system flushed thoroughly. Not like petrol, AdBlue forms crystals and eats at some fuel-system metals, and neither washes away unaided. That is why it counts more. Testing is last: before that, fresh diesel goes in, and the filter is cleaned or changed if necessary. Then our technicians fire it up and make sure it runs properly before leaving. Most jobs are done in roughly half an hour once our technicians arrive, provided your motor hasn't run — and the pumps our engineers use are fine on a busy forecourt and quiet after dark outside a house. No money upfront; you settle up that day. Afterwards, the VAT invoice and the report from the engineer are handed to you for the insurer. Before we get there, have a look at your policy; many carry cover for misfuelling. ## About Grayswood and where it is Grayswood is a small village in Surrey, situated inland at an elevation of 127 metres, and is located near Almshouse Common and Ansteadbrook. Grayswood has a population of around 552 people and is characterized by semi-detached housing. Grayswood is close to Haslemere and is approximately 18.7 miles from Chichester, while also being around 37.1 miles from London. ## Grayswood and Surrey: AdBlue drains across the area Throughout GU postcodes, our vans that cover Grayswood — a rural village — work the nearby spots too, Haslemere and Ansteadbrook included. Fastest of all: give a GU27 2 postcode for our van. Shifting the vehicle isn't necessary. Draining takes place right there, be it a driveway, a road near The Moat, or a lay-by towards Fowlshatch Copse. Ring and ask instead of assuming if you're close to a boundary, or somewhere hard to describe, like the back of Olly’s House. ## For Grayswood motorists, the short version Read the cap before you tip. If AdBlue has gone in your diesel tank anyway, leave the car off and ring 0333 366 0103. Petrol in Diesel clears it where it stands, anywhere across Surrey.