--- title: Explained: AdBlue in a Diesel Tank Gatewen canonical: https://www.petrolinadieselcar.co.uk/adblue-in-diesel/gatewen-wrexham/ location: Gatewen county: Wrexham latitude: 53.056340 longitude: -3.023470 service: AdBlue in a Diesel Tank updated: 2026-10-05 --- # Why It Happens and How to Prevent It: AdBlue in a Diesel Tank in Gatewen If AdBlue is already in your diesel tank, stop reading for a moment: leave the motor and your ignition off then ring 0333 366 0103. A drain and a full flush, done right where your car sits in Gatewen, is normally what it takes if caught before your engine runs. If you're reading before it has happened, the rest of this page is about why it occurs and how to make sure it does not. ## Why does AdBlue in a diesel motor need its own filler? Not one liquid but two: that's what plenty of newer diesels around Gatewen and Plas Coch run, with diesel for the motor. Its own tank keeps it, and from there it goes to the exhaust, and there spraying treats the fumes. Each tank has one filler of its own. On a lot of cars the two sit side by side under the same flap; on others the AdBlue filler is in the boot or under the bonnet. The diesel side is filled at the pump all the time. Much less regularly, the AdBlue side is filled — normally from a bottle, by a person working out where it goes. The slip lives in that gap. ## How does AdBlue in the diesel tank happen around Gatewen? It's hardly ever carelessness. Three things tend to line up. The warning comes first. As AdBlue runs low your car tells you, and if it runs out completely, the car drops into limp mode. So the top-up is done in a hurry: on a drive off Whitehead Drive before work, or in the car park outside The Plas Coch Pub on the way home. The old car's cap is where the hand goes — but a rental car, a new motor or a company car keeps the fillers elsewhere. That's a second thing: a strange motor. And the bottle fits. A bottle with a spout goes into a diesel filler as easily as an AdBlue one, and so nothing stops the tip once it has started. It takes seconds, be it out in New Broughton or bang in the heart of Gatewen. ## Telling the AdBlue filler from the diesel filler Look at these first, at a forecourt in Gatewen or a drive over in Little Mountain. A few seconds, that's all. - Colour and lettering: an AdBlue cap is commonly blue, or says "AdBlue", where a diesel cap usually does not. Go by the cap, not its position. - Plenty of vehicles fit AdBlue the smaller filler of the two. - A label inside the fuel flap often says which fuel goes where, on plenty of cars. Look for it. - The handbook. If your filler is not by the diesel cap, it's in your boot or under the bonnet, and the handbook says which. - Check with the person who drove it last — before you leave, not when the light comes on — when you collect a hire or company car from somewhere like the car park at Wrexham General. ## Topping up AdBlue without it reaching your diesel tank Wherever in Wrexham the light comes on, this is a routine for the day. - Turn off once parked — flat ground, motor stopped, and not rushed by Pentre Court at the roadside. - Find the AdBlue filler and read the cap. Say "AdBlue" out loud as you unscrew it. It sounds silly and it does the trick. - The two behind one flap? Then confirm the lid on the diesel filler stays shut ahead of lifting the bottle. - Tip slowly, using the bottle's own spout. Stop when it is full or when the bottle is empty. - Before starting the car, close the cap and look a second time that your diesel cap never opened off. Spot at step two or three that it's already gone into your diesel side? So stop just there. Stage five stays out. ## AdBlue in your diesel tank already, in Gatewen? The short order of things, beginning with no starting the engine. Don't switch your ignition on; on many diesels that alone runs the fuel pump. AdBlue does not mix with diesel — it sinks to the bottom of the tank, where your fuel is pulled from — so do not top up with diesel to dilute it. On a forecourt — Sainsbury's, Shell or another — the staff will usually help push the car clear, if you ask. Leave it where it is if you're on your own drive in Gatewen. Already run? Stop once it is safe, then switch off. Leave the M53 — under 15 miles out of Gatewen — at the first junction. Roughly how far did it go? Hopping across Gatewen is less work than a run of under 3 miles towards Wrexham, and so say. ## Gatewen: what happens when our technicians arrive Wherever the vehicle has stopped, be it outside the local primary school, near Lex F.C. Stansty Park or on your own drive, our van comes to it. What fluid got in, the amount, and whether it ran: our technicians ask since those answers set the work and price. On the call itself, you hear our price — before dispatch. Emptying that tank comes next, followed by a thorough flush of your system. AdBlue crystallises and is corrosive to some of the metals in a fuel system, so it doesn't wash out on its own — which is why that counts more here than with petrol. A test is last: before that, clean diesel goes in, and the filter is flushed or changed as needed. We do not leave until it has been fired up and is running properly. With pumps safe on a busy forecourt and quiet enough for use outside a house at night, most jobs where the engine has not run take roughly half an hour after our technicians arrive. Payment is on the day, not upfront, and you are given the paperwork your insurer wants: an engineer's report and a VAT invoice. Before we get there, take a look at your insurance documents; plenty carry cover for misfuelling. ## About Gatewen itself Gatewen is a locality situated on the outskirts of Wrexham, near the lakeside and at an elevation of 112 metres. Gatewen has a mix of housing types, but predominantly features terraced homes, and is close to nearby places such as New Broughton and Rhosrhedyn. Gatewen is located within a short distance of Wrexham, the nearest city, and is part of the wider Wrexham urban area. ## Gatewen and Wrexham: AdBlue drains across the area Gatewen is a neighbourhood, and our teams that cover it also work the towns around it, Rhosrhedyn and Highfield among them, across the LL postcode area. A postcode starting LL11 6 gets the van to you fastest. The car stays put. Draining takes place on the spot, be it a drive, a road near TK Maxx, or a layby on the way to Ashfield Playing Field. Awkward to pin down, like the back of William Aston Hall? Close to a border? Checking beats guessing, so phone. ## The short version for Gatewen motorists Tip nothing until you have read the cap. If AdBlue has gone in your diesel tank regardless, leave the car off then call 0333 366 0103. Petrol in Diesel clears it where it sits, anywhere in Wrexham.