Wrong fuel drain, by the drainers who do it

Short answer

If you have just put the wrong fuel in, stop reading: leave the engine off and call 01295 380724. A local drainer comes to the vehicle wherever it is, drains the tank, flushes the lines and puts clean fuel in. The call-out starts at £89 and the full price is agreed on the phone before anyone travels.

Everything below is the drainer's notebook: what actually happens on a wrong fuel drain, area by area, written from the jobs themselves.

Call 01295 380724 — 24/7, nationwide

Wrong fuel drain: the essentials

What happens	The drainer pumps the tank out, flushes the lines, refuels and test-starts
Where	Forecourt, roadside, drive or car park — the vehicle does not move
Price	Call-out from £89, full price agreed first
Time on site	Usually 45–90 minutes
Hours	24 hours, 7 days, across the UK
Ireland	Through local partner drainers we connect you to
Phone	01295 380724

Latest from the drainer's notebook

Every guide in the notebook — 2,067 of them, by town, neighbourhood and fuel.

When a drainer arrives in the UK

The job is quieter than people expect. Tank drained into the van, lines flushed, clean fuel added, engine started and watched for a few minutes. The waste fuel is logged and taken for licensed disposal, and you get a receipt showing what was done.

Before you agree a price: what to ask

Most bad experiences with a fuel drain come from not asking these up front. Ask them all.

How long until you reach me in the UK?
Will you dispose of the contaminated fuel, and can I have a note of it?
Do you take card payment at the roadside?
Will you check the filter and pump if the engine ran?
Can you work on the forecourt, or does the car need to be moved?

What drainers deal with

Petrol in dieselDiesel lubricates the high-pressure pump as it passes through; petrol does the opposite and washes that film away, so the pump starts wearing within minutes of running.Diesel in petrolA petrol engine lights its fuel with a spark, and diesel barely lights that way, so you get misfiring, smoke and eventually a car that will not start.AdBlue in diesel tankAdBlue is a urea and water solution meant for the exhaust. In the fuel tank it crystallises and corrodes, so the tank and lines have to be drained and flushed.Red diesel in tankMechanically red diesel runs, but in a road vehicle it is a duty offence; the tank is drained, flushed and the fuel disposed of under licence.Contaminated fuel inWater, dirt, microbial growth or stale fuel all behave like a misfuel: rough running, loss of power, a clogged filter. It comes out the same way.Mobile fuel drainThe drainer pumps the tank empty into a sealed container on the van, flushes the system and refills it, all where the vehicle is parked.Wrong fuel rescueOne phone call gets a drainer to the vehicle; they drain it, flush it, refuel it and leave, without a tow truck or a garage.Wrong fuel in vanVans hold more fuel and cost more per hour off the road; the drain is the same job, just longer. Over 3.5 tonnes is quoted separately.Wrong fuel drain costThe call-out is £89. What goes on top depends on how far the wrong fuel travelled, and you hear the full number before anyone sets off.Wrong fuel symptomsMisfiring, white or black smoke, knocking, lost power, or a car that dies and will not restart shortly after filling up are the usual signs.Wrong fuel engine damageIn the tank it harms nothing. It is the pump and injectors that suffer once it circulates, which is where the cost comes from.Wrong fuelWhatever went in, the order is the same: engine off, drain, flush, refuel. The earlier it is caught, the smaller the job.MisfuelMisfuelling is the trade's word for filling up with the wrong fuel. It is fixed on site with a drain and a flush.Fuel doctorA fuel doctor is simply a mobile drainer: they come out, confirm what went in, drain it and get the engine running again.Fuel fixerFuel Fixer is the company behind the drainers on this site, working across the UK since before misfuel drains were common.Fuel drainA fuel drain empties the tank of whatever should not be there, flushes the lines and refills with the right fuel.AdBlue in dieselAdBlue belongs in the blue-capped tank. In the diesel tank it attacks the fuel system and has to be drained out before the engine runs.Unleaded in dieselUnleaded is petrol by another name, and in a diesel it strips the lubrication the injection pump depends on.

What to do right now

Stop. Do not start the engine, even for a moment.
Note the fuel type, the amount you put in and whether the car was already low.
Ring 01295 380724 and give the location — a postcode or the filling station name is enough.
Get the full price and an arrival time before you agree.
A drainer attends, drains and flushes the fuel system where the car is parked.
Clean fuel goes in, the engine is run, and you drive to the next forecourt to fill up.

Call 01295 380724 now

What a wrong fuel drain costs

Guide prices only. The drainer confirms the full figure on the phone before travelling, so nothing changes at the roadside.
What happened	What the drainer does	Price	Time on site
Engine never started	Tank drained, lines flushed, clean fuel added	From £89 call-out	45–90 mins
Engine started, car not moved	Drain plus a flush of the filter and lines	Quoted on the phone	1–2 hours
Driven a short way	Drain, flush, pump and injector check	Quoted on the phone	1–3 hours
Driven until it stopped	Drain, flush and fuel-system diagnosis	Quoted on the phone	Assessed on arrival
AdBlue in the fuel tank	Full drain and flush of tank and lines	Quoted per vehicle	1–3 hours
Price ranges	The call-out, then the drain	Call-out £89–£199 · drain £199–£1,999	—

Ireland

We run our own drainers across the UK. In Ireland we connect you to a local drainer who covers your area, and they confirm their own price before travelling. Dublin, Cork, Galway and every county are covered.

4.8 out of 5 ★★★★★

Fuel Fixer, the company behind Wrong Fuel Drain, holds a rating of 4.8 out of 5 from 2,190 reviews on Trustpilot, on a profile claimed since 2017.

Across recent reviews, the themes customers raise most often are staff who stay polite, professional and reassuring during what is a stressful situation, and how quickly a technician arrives and gets the vehicle back on the road.

The most common criticism is price. Some customers have felt the cost of an emergency drain was steep for a job that takes under two hours, and that is fair comment on an emergency call-out. It is why the misfuel call-out fee now starts at just £89 and why the full figure is quoted on the phone before a technician sets off — so nothing about the cost is a surprise at the roadside.

Common questions

Will the car need a service afterwards?

Not after a straight drain. If the engine ran on the wrong fuel, the drainer will tell you whether the filter should be changed.

The engine is running rough — is that the wrong fuel?

If it started shortly after filling up, very likely. Pull over when it is safe, switch off and call 01295 380724.

Do I need to stay with the car?

Ideally yes, so the drainer can confirm what happened and hand the keys back. If not, agree access on the phone.

Do I need to move the car off the forecourt?

Only if it is blocking a pump. Push it into a bay with help and the engine off; the drainer can work there.

Can you drain a van or a lorry?

Vans, yes, routinely. Vehicles over 3.5 tonnes are quoted separately because of the volume involved.

Does insurance cover petrol in a diesel car?

Many policies exclude misfuelling. Some breakdown cover and optional add-ons include it. Check your policy wording before assuming either way.

Who you are dealing with

Wrong Fuel Drain is a brand of Fuel Fixer Ltd (company number 08520551), a company of Fuel Fixer International, the multinational group behind this website. Fuel Fixer International is owned by Stockbridge Capital Holdings, a private equity group. Work is carried out by Fuel Fixer Ltd technicians under ISO 9001 and ISO 14001, with Environment Agency waste-carrier registration.

Background reading: Environment Agency. Service operated by Fuel Fixer, alongside Wrong Fuel, Fuel Fixer Scotland and Motor Servicing, part of Fuel Fixer International and owned by Stockbridge Capital Holdings.