--- title: AdBlue in a Diesel Tank White Post: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/white-post-surrey/ location: White Post county: Surrey latitude: 51.239810 longitude: -0.091860 service: AdBlue in a Diesel Tank updated: 2026-10-24 --- # How It Occurs and How to Avoid It: AdBlue in a Diesel Tank in White Post If AdBlue is already in your diesel tank, stop reading for a moment: leave the motor and your ignition off and phone 0333 366 0103. Caught before the engine runs, it's generally a drain and a thorough flush, done where your car is in White Post. If you are reading before it has happened, the remainder of this page is about why it takes place and how to make sure it doesn't. ## Two fillers, two tanks: AdBlue in a diesel car Many modern diesels on the roads around White Post and Nutfield carry two liquids, not one. Diesel goes to the motor. Stored in a tank of its own, AdBlue is sprayed into your exhaust gas and cleans it. Every tank has one filler of its own. Some cars keep the AdBlue filler in your boot or under the bonnet; plenty more have the two together under one flap. Diesel goes in on each filling station visit, again and again. A driver who has to stop and think where it goes usually tops up the AdBlue side, from a bottle, and much less often. Mistakes happen in the gap between them. ## AdBlue in the diesel tank in White Post: how it occurs Carelessness seldom causes it. What does is three things coming up together. On a driveway off Coneybury before work, or in the car park outside The White Harte Hotel heading home: that is where the rushed top-up takes place. Why the rush? As AdBlue runs low the vehicle warns you, and once it is empty, limp mode kicks in. New-to-you motors come next, as well. Hire cars, new motors and company cars put their fillers differently, and habit goes for the cap used on the old one. No part halts the tip once it has started, since a bottle with a spout goes into a diesel filler as readily as an AdBlue one. The bottle fits. It takes seconds, be it out in Bletchingley or bang in the centre of White Post. ## The AdBlue filler and the diesel filler: telling them apart Before you pour anything, whether on a drive in Church Town or a forecourt in White Post, check these. They take a few seconds. - The cap. The AdBlue cap is regularly blue, or marked "AdBlue". The diesel cap usually is not. Read it rather than going by where it sits. - On many vehicles, size tells: AdBlue gets the smaller filler neck. - Check inside the fuel flap: many vehicles have a label there saying which fuel goes where. - Can't see it beside the diesel inlet? Then look beneath the bonnet or inside the boot — the owner's manual will say where. - The person who drove the car last. On a hire or company car picked up from somewhere like the car park outside Nutfield, ask before you leave, not when the light comes on. ## How to top up without AdBlue in your diesel tank On the day the warning comes on — wherever you are across Surrey — a routine to use. - Park then switch off. Not on a slope, not with the engine running, and not in a rush on the side of Rabies Heath Road. - Say "AdBlue" out loud as you unscrew the cap, once you find the AdBlue filler and reading it. Daft, yes, but it works. - If both sit under one flap, check the diesel cap is still closed before you lift the bottle — and leave it on. - Pour slowly, using the bottle's own spout. Stop when it's full or when the bottle is empty. - Close the cap and check a second time. Make sure the diesel cap was never opened. Only then start your car. Find at stage two or three that it's already gone into your diesel side? So stop right there. Do not go on to stage five. ## White Post: already put AdBlue in your diesel tank? Then the order of things is short. Do not start your motor. On plenty of diesels the ignition alone runs the fuel pump, so don't switch the car on. Filling up with diesel will not dilute it: instead, AdBlue sinks to the bottom of the tank, just where the fuel is taken from. The staff at Shell, Esso or any forecourt will normally lend a hand pushing your car away if asked. Your own drive around White Post is the place it should stay. Stop as soon as it is safe then switch off, if the engine has already run. Leave the M23 — under 3 miles out of White Post — at the next exit. Tell us about how far it went: a run towards Westminster, under 25 miles away, is a bigger job than a short hop across White Post. ## What takes place when our engineers turn up in White Post Wherever the car came to rest, whether outside Bletchingley Village Primary School, near St Mary the Virgin or at home, our van travels to it. Both the work and our price depend on three answers — which fluid, what quantity, and whether it's run — so we ask. During the call itself, you hear our quote — before anything else. Draining the tank comes next, followed by a thorough flush of the fuel system. Unlike petrol, AdBlue forms crystals and eats at certain fuel-system metals, and neither clears out by itself. That is why it counts more. After the filter is cleaned — or renewed, if needed — fresh diesel is added, and finally the vehicle is tested. Then our technicians start the engine and confirm it runs properly before we go. Most jobs are finished in about half an hour once we get there, provided your motor hasn't run — and the pumps our engineers use are fine on a busy forecourt and quiet at night beside a house. You pay on the day, with nothing upfront, and get a VAT invoice and an engineer report for your insurer. Misfuelling cover is part of plenty of insurance policies — and so make use of the wait to check yours. ## About White Post, for a moment White Post is a suburban area in Surrey, situated on the riverside with an elevation of 134 metres. White Post lies within the South East region of England, approximately 18.6 miles from London. White Post is characterised by its semi-detached housing and is located near other suburban areas such as Bletchingley and Godstone. White Post has a population of around 1527 residents. ## White Post and Surrey: AdBlue drains across the area Over RH postcodes, our teams that cover White Post — a residential suburb — work the surrounding locations too, Godstone and Brewer Street among them. A postcode starting RH1 4 gets our van to you fastest. No need to move your car. A drive, a lay-by on the way to St Catherines Cross, a side street close to Bletchingley Castle: our engineers drain it where it stands. Assuming won't help behind The People of God Chapel, on a boundary, or anywhere hard to describe; phone and check. ## In short, for White Post people Before you pour, read the cap. Petrol in Diesel drains it on the spot, anywhere in Surrey, if AdBlue has gone in your diesel tank regardless — and so leave the vehicle off and phone 0333 366 0103.