Petrol in the AdBlue tank
Petrol in the AdBlue tank is the most aggressive version of this contamination. Petrol is a stronger solvent than diesel and attacks the seals and diaphragms in the metering pump. Do not run the engine. Call 01295 380724.
Everything that makes diesel in the AdBlue tank serious applies here, and then some. Petrol is a lighter, more volatile solvent with a higher aromatic content, and the elastomer seals, O-rings and pump diaphragms in an SCR dosing circuit are specified for an aqueous urea solution, not for hydrocarbons. Swelling and softening of those seals is a distinct failure on top of the surface contamination, and it does not reverse when the petrol is removed.
Call 01295 380724 From just £89 call-out fee
Petrol in the AdBlue tank — the severity verdict
| Severity | Component risk Frequently needs SCR component work rather than a drain. Quoted before a technician travels. |
|---|---|
| What went where | Petrol in the AdBlue tank |
| Direction | Into the AdBlue tank |
| Typical cost | £280–£850 typical total, from a £89 call-out |
| Time on site | About 100 minutes |
| Call-out | From just £89 call-out fee |
| Helpline | 01295 380724, 24 hours |
£89 is the call-out. An AdBlue tank drain and flush is quoted on the phone before a technician travels. If the SCR system needs component replacement — dosing injector, pump, tank or catalyst — that is separate, and you will be told before any work starts. If this is a job we cannot fix at the roadside, we will tell you that on the phone rather than after we arrive.
What to do right now
- Do not start the engine and do not cycle the ignition repeatedly.
- Ventilate — petrol vapour in a vented AdBlue tank is a real consideration, especially in a garage.
- Do not add AdBlue on top.
- Call 01295 380724.
What a technician actually does
Drain and hydrocarbon capture, water and AUS 32 flushing, and a seal and diaphragm assessment on the metering pump — which is the component most likely to need replacing after petrol exposure. Any replacement is quoted before it is done.
Why this is not the same job as the other direction
This is contamination of the SCR dosing circuit — tank, metering pump, heated lines, dosing injector and potentially the catalyst. It is not the fuel system, and it is not the cheaper job. Anyone quoting a flat drain price for this has not looked at the system.
Common questions
Is petrol worse than diesel in the AdBlue tank?
Generally yes. Both contaminate the circuit; petrol is the more aggressive solvent and adds a seal and diaphragm failure mode on top.
The engine started and ran normally. Is it fine?
Running normally is expected — the SCR circuit is in the exhaust, not the engine, so the engine will not feel it. The damage happens quietly and shows up later as a dosing fault or a failed NOx conversion.
Can this be done at the roadside?
The drain and flush, yes. Metering pump replacement usually cannot. You will be told which of those you are looking at on the phone rather than after a technician arrives.
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: Diesel exhaust fluid (Wikipedia).
Across the Fuel Fixer network
Every brand above belongs to Fuel Fixer International, owned by Stockbridge Capital Holdings. The directory lives on the operator's own site: forecourtassist.co.uk/network.