# I started the engine before i realised. what now | answered > I started the engine before i realised. what now: Say so on the phone. If it ran only briefly the job is usually still a drain, a flush and a filter, with a… - URL: https://adblueinfuel.co.uk/answers/i-started-the-engine-before-i-realised-what-now/ - Focus: i started the engine before i realised. what now - Updated: 2026-11-02 - Phone: 01293 248666 (Call-out from £89) - Publisher: AdBlue in Fuel — a service by Forecourt Assistance — Forecourt Assistance is a trading name of Fuel Fixer Ltd, company no 08520551, registered at Fairway House, Portland Road, East Grinstead, RH19 4ET, a company of Fuel Fixer International. --- ## I started the engine before i realised. what now Short answerI started the engine before i realised. what now — say so on the phone. If it ran only briefly the job is usually still a drain, a flush and a filter, with a fuel-system pressure check. If it ran long enough to run rough or cut out, injectors and the high-pressure pump may need testing, and that is quoted separately. Call 01293 248666 Call-out from £89 Tap for soundTap to callAnswered by Rambo S, Wrong Fuel Expert at Fuel Fixer International. ## I started the engine before i realised. what now — the context AdBlue is AUS 32 — 32.5% urea in demineralised water — with a density around 1.09 g/cm³ against diesel's roughly 0.83. It does not dissolve into diesel. It sinks, and it settles exactly where the fuel pickup sits. The moment the engine turns over, the lift pump draws urea solution through the filter and into the high-pressure pump and injectors, which are lubricated by diesel and are not designed to see water or urea. Urea also crystallises as it dries and attacks copper, brass, aluminium, zinc and mild steel. If you have put AdBlue in diesel, do not start the engine — call 01293 248666. AdBlue is water-based and sinks to the bottom of the tank, so a drain and flush before the engine runs almost always fixes it. **The problem behind this question** | Topic | AdBlue in diesel | Severity | Recoverable Normally put right by a drain and flush, provided the engine has not been run. | Typical cost | Call-out £89 to £199 · drain £199 to £1,999 | Time on site | About 60 minutes | Helpline | 01293 248666 Most bad advice on this subject comes from treating the SCR system as if it were part of the engine. It is not. It sits in the exhaust, downstream of combustion, and nothing poured into the AdBlue tank ever reaches a piston. The call-out is £89 to £199. 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. ### Related reading ### Start here AdBlue in dieselWhat AdBlue actually isDriver inducementSCR vs DPF ### More answers How much did you add, and did the gauge move at all?How do I tell which filler I used?Does freezing ruin it?Does freezing ruin AdBlue?How long does an opened container last?Will this be covered by a warranty?How do I know if fluid is certified?Can you flush it with water alone?Does AdBlue go in the engine?Will the fuel pump need replacing? ## 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 Call-out from £89, 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. ## 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 Assistance and part of Fuel Fixer International, which is owned by Stockbridge Capital Holdings. Reference: Selective catalytic reduction (Wikipedia). ## Across the Fuel Fixer network Forecourt AssistanceFuel FixerFuel Fixer AberdeenFuel Fixer DundeeFuel Fixer EdinburghFuel Fixer GlasgowFuel Fixer InvernessFuel Fixer PerthFuel Fixer ScotlandFuel Fixer StirlingMisfuel DoctorMotor ServicingWrong FuelWrong Fuel CarlisleWrong Fuel CumbriaWrong Fuel DarlingtonWrong Fuel DrainWrong Fuel DumfriesWrong Fuel DurhamWrong Fuel GatesheadWrong Fuel KendalWrong Fuel KeswickWrong Fuel MaryportWrong Fuel MiddlesbroughWrong Fuel NewcastleWrong Fuel PenrithWrong Fuel SunderlandWrong Fuel TeessideWrong Fuel WhitehavenWrong Fuel WorkingtondataStockbridge Capital HoldingsAdBlue in Fuel is a service by Forecourt Assistance, a brand of Fuel Fixer International, owned by Stockbridge Capital Holdings. The full group directory is at forecourtassist.co.uk/network.