--- title: Godmanchester: AdBlue in a Diesel Tank, Explained canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/godmanchester-cambridgeshire/ location: Godmanchester county: Cambridgeshire latitude: 52.319330 longitude: -0.175000 service: AdBlue in a Diesel Tank updated: 2026-10-05 --- # AdBlue in a Diesel Tank in Godmanchester: How It Occurs and How to Prevent It AdBlue already in your diesel tank? Then set this page aside a moment, leave the ignition and engine off, then call 0333 366 0103. Caught before the motor runs, it is normally a drain and a thorough flush, done where the car is in Godmanchester. The rest of this page covers why it occurs and how to ensure it doesn't — useful if you are reading ahead of time. ## AdBlue in a diesel car, and its separate tank Many newer diesels around Hinchingbrooke, like those in Godmanchester, run on two liquids; the engine takes only your diesel. Stored in a tank of its own, AdBlue is sprayed into your exhaust stream and cleans it. Different tanks, different fillers. Other motors keep the AdBlue filler in the boot or under the bonnet; a lot more place the two together behind one flap. Topping up your diesel side at the petrol pump happens all the time. The AdBlue side is filled far less regularly, usually from a bottle, and usually by someone who has to stop and think where it goes. It's in the gap that the mistake lives. ## How does AdBlue in your diesel tank happen in Godmanchester? Rarely is it carelessness: normally three things line up. On a driveway off Cambridge Street before work, or in the car park outside The Royal Oak heading home: that is where the rushed top-up takes place. What is the reason for the rush? As AdBlue runs low the car tells you, and once it's gone, limp mode kicks in. Then your car is new. A hire car, a new motor or a company car puts the fillers where your last one did not, and your hand gets to for the cap it would have used on the old one. No part halts the pour once it has started, since a bottle with a spout goes into a diesel filler as easily as an AdBlue one. The bottle fits. Belle Isle or the middle of Godmanchester: it is the same few seconds in both. ## Which filler is for AdBlue, and which for diesel? Before you pour anything, whether on a drive in Hartford or a forecourt around Godmanchester, check these. They take a couple of seconds. - Check the cap instead of going by position: AdBlue ones are often blue or marked "AdBlue", and diesel ones usually aren't. - The size. On plenty of motors the AdBlue filler neck is the smaller of the two. - Look inside the fuel flap: many vehicles carry a label there saying which fuel goes where. - In your boot or under the bonnet: that is where your filler sits if it's not by the diesel cap, and the handbook tells you which. - The person who drove it last. On a hire or company car picked up from somewhere like the car park at Huntingdon, ask before you leave, not when the light comes on. ## AdBlue top-ups that never reach the diesel tank On the day the warning appears — wherever it is around Cambridgeshire — a simple routine to use. - Park and switch off. Not on a slope, not with the motor running, and not in a rush on the side of Causeway. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds silly and it works. - The two under one flap? Then confirm the cap on your diesel filler stays shut ahead of raising the bottle. - Using the bottle's own spout, tip slowly — and stop when it's full or the bottle is empty. - Only then, start the vehicle: close the cap, check once more, and make sure your diesel cap was never opened. Spot at stage two or three that it has already gone into the diesel side? So stop just there. Never carry on to step five. ## AdBlue in the diesel tank already, around Godmanchester? Short order, then. First: the engine stays off. On many diesels the ignition alone runs the fuel pump, so do not switch it on. Filling up with diesel will not weaken it: rather than mixing, AdBlue drops to the bottom of your tank, just where the fuel is drawn from. On a forecourt — Shell, Sainsbury's or any other — the attendants will usually help roll your car clear, when you ask. Your own drive in Godmanchester is the place it stays. Stop as soon as it is safe then switch off, if your motor has already run. On the A1(M), under 5 miles from Godmanchester, that means the next exit. Roughly how far did it go? Crossing Godmanchester is less a job than a run of under 15 miles towards Cambridge, so tell us. ## Our arrival in Godmanchester, and what happens next The van comes to the car anywhere it has come to rest — your own drive, near Old Queen Elizabeth School, or outside Godmanchester Community Academy. What liquid went in, the quantity, and whether it ran: our engineers ask because those answers decide the work and quote. Nobody sets off until you have had the price over the phone. Then your tank is emptied and your system purged thoroughly. Much more than with petrol, it counts here: crystals build up, certain metals are attacked, and nothing clears away on its own, however long it sits. Testing comes at the end: before that, clean diesel goes in, and your filter is cleaned or replaced if necessary. Your engine is fired up next and tested to make sure it runs smoothly, all before we head off. Unstarted vehicles mostly need a half-hour visit from the moment we arrive. The kit is safe on a busy filling station, and hushed enough for a driveway late at night. The insurer usually wants an engineer's report and your VAT invoice, and both are yours once the job is done. Payment comes on the day, with no money upfront. Many insurance policies include misfuelling cover, and so it's worth checking yours whilst we are on the way. ## About Godmanchester, for a moment Godmanchester is a town situated on the banks of the River Great Ouse in Cambridgeshire, with a mix of old and new buildings reflecting its long history. Godmanchester sits at a low elevation of around 12 metres, close to the larger town of Huntingdon and the city of Cambridge. Godmanchester has a population of approximately 9657 people, living in predominantly detached housing, and is located near other smaller places such as Belle Isle and Newtown. ## AdBlue drains across Cambridgeshire, Godmanchester included Godmanchester is a riverside town, and the teams that cover it also work the towns near it, Newtown and Huntingdon among them, across the PE postcode area. Our van gets to you fastest with a postcode starting PE29 2. Shifting your car is not needed. The drain takes place on the spot, be it a drive, a road by Godmanchester Town Hall, or a layby on the way to Godmanchester Recreation Ground. If you're close to a boundary, or somewhere hard to describe like the back of St Mary The Virgin (Godmanchester Parish Church), ring and ask instead of assuming. ## Godmanchester drivers: the short version Read the cap before you tip. Petrol in Diesel drains it where it stands, anywhere in Cambridgeshire, if AdBlue has gone in your diesel tank all the same — and so leave the vehicle off and phone 0333 366 0103.