Grovehill: 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 a moment, leave your ignition and motor off, and phone 0333 366 0103. Caught before your motor runs, it is usually a drain and a thorough flush, done where the car is in Grovehill. Not happened yet? Further down, the page covers the reasons it occurs and the ways to avoid it for good.
Two fillers, two tanks: AdBlue in a diesel motor
Not one fluid but two: that is what many modern diesels around Grovehill and Holtsmere End carry, with diesel feeding your engine. AdBlue's own tank holds it, and from there it goes to your exhaust, and there a spray cleans the gas.
Each tank has its own filler. Other vehicles put the AdBlue filler in your boot or under the bonnet; plenty more have the two side by side under one flap. At the petrol pump, your diesel side is topped up constantly. Rarely filled, AdBlue usually comes from a bottle, poured by someone who has to stop and think what filler to use. That gap is where the slip lives.
Grovehill: how AdBlue in your diesel tank occurs
It's seldom carelessness. Three things tend to line up.
To start with, the warning. Low AdBlue brings a message from the car, and letting it run dry leads to limp mode — hence a hurried top-up, perhaps before work off Washington Avenue, or at Marchmont Arms on the way home that evening.
Then the car is unfamiliar. A hire car, a new car or a company car puts the fillers where your last one didn't, and your hand hits for the cap it would have used on the old one.
Third, the bottle fits: a diesel filler or AdBlue filler, it goes in just as easily, and once the pour starts, no part stops it. It takes a few seconds, whether in Cupid Green or bang in the centre of Grovehill.
How to tell the AdBlue filler from the diesel one
Whether a Grovehill forecourt or a drive out in Adeyfield, take a few seconds on these before any goes in.
- Where it sits misleads; the cap doesn't. AdBlue caps are often blue or bear the name "AdBlue" — diesel caps normally don't.
- On plenty of cars, size tells: AdBlue gets the smaller filler neck.
- Lift the flap and check for a label — plenty of motors mark what belongs in which inlet just there.
- The handbook. If your filler isn't by your diesel cap, it's in your boot or under the bonnet, and the handbook says which.
- The person who drove the vehicle last. On a hire or company car collected from somewhere like the car park at Hemel Hempstead, ask before you leave, not when the light comes on.
AdBlue top-ups that never reach your diesel tank
For the day the light comes on — anywhere it is in Hertfordshire — a routine to use.
- Park then switch off. Not on a slope, not with your engine running, and not in a rush on the side of Aycliffe Drive.
- Silly as it sounds, saying "AdBlue" aloud while you unscrew the cap does the trick — once you have found your filler and read it.
- Leave your diesel cap on. If both sit under one flap, check the diesel cap is still closed before you lift the bottle.
- Gently does it, through the bottle's own spout, till it is full or the bottle runs out.
- Close the cap, and check once more — confirm the diesel cap stayed shut throughout. Only then, start the vehicle.
Find at the second or third stage that AdBlue went into the diesel tank? That's where you stop. Leave out stage five entirely.
AdBlue in your diesel tank already, in Grovehill?
What follows is a short order of things, beginning with no starting your engine. The fuel pump runs on plenty of diesels as soon as the ignition goes on — and so leave it off. Thinning it with extra diesel fails, since AdBlue sinks to the base rather than blending — and that's where the fuel is drawn from.
Ask the attendants to help roll the vehicle clear of the pump if you're on a forecourt — the Asda Express, the Shell or anywhere else. If you're on your own driveway in Grovehill, leave the car where it stands.
Where your engine has been run by now, pull over somewhere safe and turn it off. On the M1, under 3 miles from Grovehill, that means the next junction. Distance matters — a short hop across Grovehill makes a smaller job than driving under 10 miles towards St Albans — so tell us about how far it went.
Our arrival around Grovehill, and what takes place next
Anywhere the vehicle has stopped, be it outside Aycliffe Drive Primary School, near Grovehill Community Centre or at home, our van comes to it. Which fluid was put in, the quantity, and whether it ran: our technicians ask since those answers decide both work and quote. You get that quote on the phone, before anyone heads out.
The system is then purged thoroughly, after your tank is emptied. Much more than with petrol, it matters with AdBlue: crystals form, certain metals are attacked, and none of that washes away unaided, no matter how long it sits. The filter is cleaned, or replaced where it needs to be; clean diesel goes in; and the vehicle is tested. Before we go, we start the engine and confirm that it is running properly.
If your engine hasn't run, the majority of jobs take about half an hour once we're there, using pumps that are fine on a busy forecourt and quiet enough to use outside a house after dark. You pay on the day, with nothing upfront, and get a VAT invoice and an engineer report for your insurer. It is worth looking at your insurance while we travel to you: misfuelling cover comes with many policies.
About Grovehill
Grovehill is a suburban area in Hertfordshire, situated approximately 5 miles northwest of St Albans and 23 miles north of London. Grovehill sits at an elevation of around 145 metres, amidst the rolling countryside of the Chiltern Hills. Grovehill is characterized by its predominantly terraced housing stock, with nearby neighbourhoods including Cupid Green, Highfield, and Piccotts End.
AdBlue drains around Grovehill and across Hertfordshire
Highfield and Piccotts End are among the towns near Grovehill, a residential suburb, that the same teams cover, throughout HP postcodes. Quote a postcode that starts HP2 6, and the van gets there fastest.
Your car does not need to move. Our engineers drain it where it is — a side street near Church of the Resurrection, a lay-by on the way to Grovehill Playing Fields, a driveway. Guessing doesn't help at the back of The Dacorum Hub, close to a boundary, or somewhere awkward to pin down; phone and ask.
For Grovehill drivers, the short version
Always, the cap; then, the tip. AdBlue in the diesel tank after all? Leave the car off then call 0333 366 0103; Petrol in Diesel drains it where it stands, across Hertfordshire.