Why It Occurs and How to Avoid It: AdBlue in a Diesel Tank in Forth
AdBlue already in your diesel tank? Then set this page aside for now, leave your ignition and motor off, then call 0333 366 0103. Caught before your engine runs, it is normally a drain and a thorough flush, done where your car is in Forth. The remainder of this page explains why it occurs and how to ensure it doesn't — handy if you're reading before it has happened.
AdBlue in a diesel vehicle, and its separate tank
Diesel feeds your motor — yet many modern diesels seen round Forth and Stobwood carry a second fluid too. AdBlue's own tank holds it, and from there it is sent to the exhaust, and there spraying treats the fumes.
Different tanks, different fillers. Plenty of cars share a single flap for both, whereas others put the AdBlue filler to your boot or under the bonnet. The diesel side is filled at the petrol pump all the time. The AdBlue side is fuelled far less commonly, usually from a bottle, and normally by someone who has to stop and think where it goes. It's in the gap that the mistake lives.
AdBlue in the diesel tank around Forth: how it happens
It is hardly ever carelessness. Three things tend to line up.
To start with, the warning. Low AdBlue brings a warning from your car, and letting it run out leads to limp mode — hence a rushed top-up, maybe before work off Kirk Green, or at the pub in the village on the way home after work.
Next, the hand reaches for the cap it knew on the old vehicle — because a hire car, a new car or a company car puts the fillers where your last one did not.
And the bottle fits. A bottle with a spout goes into a diesel filler as easily as an AdBlue one, so nothing stops the pour after it has started. Whether it happens in Wilsontown or the middle of Forth, it is the same few seconds.
Telling the AdBlue filler from your diesel filler
Before you tip anything, whether on a driveway in Climpy or a forecourt in Forth, check these. They take a few seconds.
- Check the cap instead of going by where it sits: AdBlue caps are regularly blue or marked "AdBlue", and diesel ones usually are not.
- The size. On many vehicles the AdBlue filler neck is the smaller of the two.
- Check inside your fuel flap: many cars carry a label there showing which fuel goes where.
- The handbook. If the filler isn't by your diesel cap, it is in the 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 outside Fauldhouse, ask before you leave, not when the light comes on.
AdBlue top-ups that never reach your diesel tank
For the day the warning appears — wherever it is around South Lanarkshire — a routine to follow.
- Park then switch off. Not on a slope, not with your engine running, and not in a rush on the side of Reid Street.
- Locate the AdBlue filler, read the cap, and speak the word "AdBlue" aloud as unscrewing it. It seems daft. It does the trick.
- The diesel cap remains on. When both sit under a flap, confirm it is shut before the bottle comes up.
- Tip slowly, using the bottle's own spout. Stop when it is full or when the bottle is empty.
- Close the cap and check once more. Make sure your diesel cap was never opened. Only then start your car.
Find at the second or third step that AdBlue went into the wrong tank? That's where you stop. Skip stage five altogether.
Forth: already put AdBlue in your diesel tank?
Then the order of things is short. Don't start your engine. Keep the ignition off too, since on plenty of diesels it alone starts your fuel pump. Do not top up with diesel to dilute it: AdBlue does not mix with diesel, it sinks to the bottom of the tank, where your fuel is pulled from.
Ask the staff to help roll the vehicle away from the petrol pump if you're at a forecourt — the Esso, the another forecourt nearby or somewhere else. Your own drive around Forth is where it stays.
When your motor has been run already, pull over somewhere safe then switch the vehicle off. On the M8, under 10 miles from Forth, that means the next junction. A short hop across Forth is a smaller job than a run towards Glasgow, under 25 miles away, so tell us roughly how far it went.
Forth: what occurs when our engineers get there
By the local primary school, near St Paul’s or on your own drive: wherever the car has stopped, we come to it. Both the work and our quote depend on three replies — what liquid, what quantity, and whether it has run — so we ask. The price is given over the phone, ahead of any van leaving.
Then your tank is drained and your system flushed thoroughly. Not like petrol, AdBlue forms crystals and eats at some fuel-system metals, and none of it washes away by itself. That is why it matters more. A test comes last: before that, fresh diesel goes in, and the filter is cleaned or replaced as needed. Your engine is fired up next and checked to make sure it runs properly, all before our technicians leave.
With pumps safe on a working forecourt and quiet enough for use outside a house at night, most jobs in which the engine has not run take roughly half an hour after we are there. Nothing in advance; you settle up on the day. Afterwards, a VAT invoice and a report from the engineer are handed to you for your insurer. It's worth looking at your insurance as the van travels to you: misfuelling cover is included with plenty of policies.
About Forth itself
Forth is a small village in South Lanarkshire, situated inland at an elevation of 285 metres. Forth lies approximately 22 miles southeast of Glasgow, and is surrounded by nearby places such as Wilsontown, Rootpark, and Greenwall. Forth has a population of around 1354 people, and its predominant housing stock consists of terraced homes. Forth is located relatively far from London, at a distance of around 328 miles.
Forth and South Lanarkshire: AdBlue drains across the area
Over ML postcodes, the vans that cover Forth — a rural village — work the nearby spots too, Greenwall and Rootpark among them. A postcode starting ML11 8 gets our van to you fastest.
The vehicle does not need to shift. Our engineers drain it where it is — a side street near War Memorial, a lay-by on the way to Wester Heathland, a drive. Guessing won't help behind Forth And District Miners Memorial, on a border, or somewhere hard to pin down; phone and ask.
For Forth motorists, the short version
Before you pour, read the cap. Petrol in Diesel drains it on the spot, anywhere around South Lanarkshire, if AdBlue has gone in your diesel tank regardless — so leave the car off then phone 0333 366 0103.