AdBlue in the wrong filler
If you have put AdBlue in the wrong filler, stop before you start the engine and work out which filler it was. Diesel filler means a drain and flush; screen wash means a rinse. Call 01295 380724 and describe the cap.
The two caps sit together under one flap on most modern diesels and the AdBlue cap is usually blue, sometimes marked with the standard AUS 32 or a urea symbol. Fleet vehicles, courtesy cars and unfamiliar hire vehicles are where this goes wrong most. The right response depends entirely on which filler received it, and the costs are an order of magnitude apart.
Call 01295 380724 From just £89 call-out fee
AdBlue in the wrong filler — the severity verdict
| Severity | Recoverable Normally put right by a drain and flush, provided the engine has not been run. |
|---|---|
| What went where | AdBlue in the wrong filler |
| Direction | AdBlue into somewhere else |
| Typical cost | £89–£450 typical total, from a £89 call-out |
| Time on site | About 60 minutes |
| Call-out | From just £89 call-out fee |
| Helpline | 01295 380724, 24 hours |
What to do right now
- Do not start the engine until you know which filler it was.
- Look at the cap colour and any marking, and photograph it.
- Check the level — if the AdBlue gauge has not moved, it did not go where you think it did.
- Call 01295 380724 and describe what you see.
What a technician actually does
Identification first, then the correct procedure: fuel-tank drain and flush, screen wash bottle flush, or in the rare oil or coolant case the appropriate system flush.
Why this is not the same job as the other direction
This is contamination of the fuel side. The SCR system itself is untouched, which is why this direction is the recoverable one — provided the engine has not been run. Starting it is what turns a drain into pump and injector work.
Common questions
How do I tell which filler I used?
The AdBlue cap is normally blue and sits next to the diesel cap under the same flap. Photograph the filler area and describe it on the phone — that identification is the first thing that gets done.
The AdBlue gauge has not moved. Is that meaningful?
Yes. If the level did not rise, the fluid went somewhere else, and the fuel tank is the first place to check.
Can I start the engine to check the warning lights?
No. If it went into the diesel tank, starting it is the one action that turns a straightforward drain into injector and pump work.
What customers say
4.8 out of 5 from 2,190 Trustpilot reviews. What reviewers mention most is that the technician stayed calm and professional with a driver who was embarrassed and stressed, and that somebody arrived when they said they would.
The most common criticism is price. People do not expect a wrong-fluid job to cost what it costs, and that is a fair complaint to publish rather than bury. The answer is the From just £89 call-out fee, a quote given on the phone before a technician travels, and being told when a job cannot be done at the roadside rather than after somebody has arrived and charged for the visit.
Related AdBlue problems
Start from a symptom instead
Where we cover
Who you are dealing with
Work booked through AdBlue in Fuel is carried out by Fuel Fixer Ltd, company no 08520551, registered at Fairway House, Portland Road, East Grinstead, RH19 4ET, trading as Forecourt Assist and part of Fuel Fixer International, which is owned by Stockbridge Capital Holdings.
Reference: GOV.UK — vehicle approval.
Across the Fuel Fixer network
These are sister brands of the same company, not unrelated sites. Forecourt Assist keeps the canonical list at forecourtassist.co.uk/network rather than duplicating it here.