--- title: AdBlue in a Diesel Tank Keyham: Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/keyham-devon/ location: Keyham county: Devon latitude: 50.388670 longitude: -4.176120 service: AdBlue in a Diesel Tank updated: 2026-10-13 --- # AdBlue in a Diesel Tank in Keyham: Why It Happens and How to Stop It Leave the engine and ignition off then call 0333 366 0103 first — reading can wait if AdBlue is already in the diesel tank. Around Keyham, catching it before your motor turns usually means a drain and a thorough flush where it stands. Not happened yet? Further down, the page explains the why it takes place and the ways to prevent it altogether. ## AdBlue in a diesel motor: two tanks, two fillers Plenty of newer diesels around Devonport, like those in Keyham, carry on two liquids; the motor gets just the diesel. AdBlue's own tank keeps it, and from there it goes to the exhaust, and there a spray cleans the fumes. There is a filler for every tank. Plenty of cars share a single flap for the two, whereas others put the AdBlue filler to the boot or under the bonnet. At the petrol pump, the diesel side gets filled all the time. Seldom filled, AdBlue normally goes in from a bottle, tipped by a driver who must stop and think what filler it needs. Mistakes happen in that gap between the two. ## AdBlue in the diesel tank in Keyham: how it occurs Seldom is it carelessness: normally three things coincide. The warning comes first. As AdBlue runs low the vehicle tells you, and if it runs out altogether, the car drops into limp mode. So the top-up is done in a hurry: on a drive off Renown Street before work, or in the car park at Keyham Barton Consevative Club on the way home. Then your car is unfamiliar. A hire car, a new vehicle or a company car puts the fillers where your last one didn't, and the hand reaches for the cap it would have used on the old one. No part halts the pour after it has started, because a bottle with a spout goes into a diesel filler as easily as an AdBlue one. The bottle fits. The same few seconds decide it, in the middle of Keyham or out in Camels Head. ## Telling the AdBlue filler from the diesel filler Look at these first, on a forecourt around Keyham or a drive out in Weston Mill. Seconds, that's all. - Position misleads; the cap does not. AdBlue ones tend to be blue or carry the name "AdBlue" — diesel caps normally do not. - On many cars, the size gives it away: AdBlue has the smaller filler neck. - The flap. Look inside the fuel flap for a label. Many motors say there which fuel goes where. - The handbook says where it lives if the filler isn't next to your diesel cap: your boot, or under the bonnet. - Whoever had it before will know. Ask as you pick up a rental or company car — at the nearest station's car park, perhaps — not when the light appears. ## AdBlue top-ups that never reach your diesel tank On the day the light appears — anywhere it is around Devon — a routine to follow. - Stop somewhere level, motor off, with time in hand — never hurried on the side of Barton Avenue. - Silly as it sounds, saying "AdBlue" aloud while you unscrew the cap works — after you've found the filler and read the cap. - Leave the diesel cap on. If both sit under one flap, check the diesel cap is still closed before you lift the bottle. - Slowly does it, through the bottle's own spout, until it is full or the bottle runs out. - Before starting the vehicle, close the cap and look a second time that your diesel cap never came off. Find during the second or third step that the bottle went into the wrong tank? That is where you stop. Step five is off limits. ## Keyham: already put AdBlue in the diesel tank? Then the order of things is short. Do not start your engine. Leave your ignition off as well, since on plenty of diesels switching it on alone starts the pump. Don't top up with diesel to thin it: AdBlue doesn't mix with diesel, it sinks to the bottom of the tank, where the fuel is sucked from. On a forecourt — Gulf, Esso or any other — the staff will usually help roll the vehicle away, if you ask. Leave it where it is if you are on your own drive around Keyham. Already started? Pull over once it's sensible, then turn off. Keyham lies under 50 miles from the M5; there, use the next junction. A short hop across Keyham is a smaller job than a run towards Plymouth, under 3 miles away, so tell us about how far it went. ## What occurs when our technicians arrive around Keyham Wherever the vehicle came to rest, be it outside Keyham Barton Catholic Primary School, beside St Thomas the Apostle or on your own drive, the van travels to it. We ask what got in, about how much, and if it has run, because those answers decide the work and our price. During the phone call itself, you are told our price — ahead of anything else. Then that tank is cleared and the fuel system rinsed thoroughly. Unlike petrol, AdBlue leaves crystals and eats at certain fuel-system metals, and none of it clears away by itself. Hence it matters more. Your filter is flushed, or replaced where it needs to be; fresh diesel goes in; and your car is tested. Then our technicians fire it up and confirm it runs correctly before we leave. Most jobs are done in about half an hour once our engineers get there, as long as your engine has not run — and the pumps our technicians use are safe on a live forecourt yet quiet at night beside a house. The insurer usually wants an engineer's report and the VAT invoice, and you get both at the end. Payment comes on the day, with no deposit. Plenty of insurance policies include misfuelling cover, so it's worth checking yours whilst we're on the way. ## About Keyham itself Keyham is a suburban area located on the coast of Devon, approximately 2 miles from Plymouth, and sits at an elevation of 36 metres. Keyham is characterized by its predominantly terraced housing and is close to nearby places such as Camels Head and Ford. Keyham forms part of the larger Plymouth urban area, with the city centre and its amenities within easy reach. Keyham is also situated near North Prospect, another suburban area in the region. ## AdBlue drains around Keyham and across Devon As a residential suburb, Keyham shares its vans nearby areas — Ford, North Prospect — all the way across PL postcodes and the surrounding area beyond. Quote a postcode beginning PL2 2, and the van arrives fastest. No need to shift the car. The drain happens on the spot, whether a drive, a road by St Nicholas Church, or a layby towards Tennis Courts. Ring and ask instead of assuming if you are close to a border, or somewhere hard to explain, like the back of Help for Heroes. ## For Keyham drivers, the short version Before you tip, read the cap. Even so AdBlue in the diesel tank? Petrol in Diesel will drain it where it is, anywhere in Devon: switch it off then ring 0333 366 0103.