Put Petrol in a Diesel Car in Winnersh? Don't Start It
With your tank still carrying the petrol and your engine not yet started, almost every job requires only a drain, so leave the motor off. That outcome is settled in the minutes right after filling up, rather than by the amount that went in. Throughout Winnersh and the remainder of Berkshire, Petrol in Diesel drains your car and cleans it where it stands, whether by a roadside, on a private drive or at a forecourt. Our technicians will show you what your next step will be. Phone — that goes ahead of everything else.
What next? Petrol in a diesel, step by step
- Never crank it — and do not trust it when it runs. That is the part motorists have wrong about petrol in a diesel specifically. A petrol engine filled with diesel typically just can't run, so the motorist stops and the wear halts with them. A diesel given petrol normally starts, ticks over and drives away perfectly well for a couple of miles. It's not okay. It's wearing your fuel system while you drive.
- Turning your ignition on commonly primes your system, and priming is what pulls petrol out of the tank and into your pump and injectors. Those are the parts diesel keeps lubricated on its way through, before it burns. Petrol manages the burning and none of the protecting. Leave your ignition be.
- That advice presumes a diesel fuel system handles petrol by percentage. It won't. Pour diesel on top and nothing at all is removed; what you have is a fuller tank of the same mixture. And no, the octane makes no difference — super unleaded is just petrol.
- Wait where you are if you safely can. A vehicle that has never shifted is the simplest one to sort out, and we would sooner come to an awkward place than have it started. If you're stopped on the verge on Danywern Drive, put the hazards on and leave it there.
- Check where you are before ringing. A postcode starting RG41 5, and the name of whatever is nearest to you. Otherwise the technician circles rather than arriving.
- Three answers determine your whole job: the stuff you tipped in, the approximate volume of it, plus if anything has been turning since. Our number is 0333 366 0103.
Removing petrol from the diesel at the forecourt
Most of the job begins at a pump, which means a good chunk of it gets done there. We work on station forecourts routinely, with the owner's consent, and so if you're still at BP that is generally where this drain takes place.
Before the engine has started — a garage is the one place the mistake ends up spotted. Anywhere else — a car park, a private drive, a lay-by — your car was started and driven to get there, which means fuel was sucked from the tank, through the filter then into the high-pressure fuel pump. That is not a calamity, and we can still sort it out where it is. It does mean the lines and the filter need flushing as well as your tank, and that's decided by the few seconds between checking the receipt and reaching for the keys.
Staff will usually help out pushing it clear of the petrol pump, which lets the next driver get past. Accept the help. Four vehicle lengths isn't worth a restart.
Car parks like the one at Sainsbury's are a spot our engineers attend regularly, and the fuel is rarely the tricky part. The bay is: motors either side, a trolley shelter behind, occasionally a height limit on the way in that settles if our van can reach you at all. So tell us how penned in you are when you call, and which way the car is facing. If we cannot work beside the diesel Volkswagen Tiguan we'll roll the car without firing it — and that isn't pedantry about a few seconds of running. Any start primes the fuel system and pulls more of that mixture out of your tank and towards your pump, and so a car moved twice into a roomier bay has gradually turned into a worse job than one left precisely where it stopped.
Shift it out of that gateway and deal with it later — that is what someone will say, and it is wrong. Stopped on the zig-zags at Winnersh Primary School, a misfilled diesel Skoda Octavia is a nuisance and nothing worse. Restarted three more times for courtesy, it is no longer a tank problem but a fuel system one, as priming occurs with every start and more petrol goes past the filter toward the pump. Let everyone complain. Phone us.
Simple job, this one — till somebody takes it home. A diesel BMW 3 Series sitting by The Wheelwright's Arms with petrol in the tank loses nothing by standing there overnight, and so park it and phone once it's light. Expect a query about that run there, though. Brief and chilly is precisely where petrol struggles to burn, and what won't burn can work past the rings then into the engine oil.
A car you picked up two days ago gets driven further before anyone notices anything, which is the hire and courtesy fault in one sentence — and how far it went is what determines the amount of petrol getting to the injectors. Nothing careless about the mistake itself: a modern diesel filler neck takes the narrower petrol nozzle with almost no resistance, so new locations see most of these. Call us from wherever you are, close to Winnersh Library or not, and we'll get to the Peugeot 208.
By this point that tank isn't where most of the damage is. Once a diesel has run, that mixture is in the fuel filter, the lines, your pump and its rail — and it doesn't come back out with that tank contents. A diesel Citroen C3 that got near Gymnasium needs the circuit purged, not drained.
Places we cover in Winnersh
Winnersh is a small village, and our team get out to it and to anywhere around it on the same journeys: Merryhill Green, Sindlesham, Emmbrook, Woosehill and Matthewsgreen.
Our engineers do come. Those names above are only the immediate neighbours, and a page exists for most towns in Berkshire, and so an absence from the list is not an absence from our coverage. Ring us and check instead of presuming — county lines especially, and anywhere the satnav might get wrong.
The patch the page includes appears on this map. The vehicle never needs to come to us. Our technicians work throughout every bit of it — roadside, forecourts, driveways, car parks.
Broken down by the roadside in Winnersh
Not everyone has the chance to pull in somewhere suitable. If you realised after setting off and ended up on the verge beside Garth Close, or at a lay-by somewhere with the hazard lights flashing, that's a normal call for us rather than an unusual one.
Clear of the car while it is not wise to wait in it, beside it when it is. Never fire it up to reach a nicer place. It will go — a diesel on petrol usually obliges — and each mile of obliging drags the mix deeper into the system. However inconvenient the spot, it's no trouble for us to come to it, and that's far better for the vehicle than driving on.
Petrol in a diesel, and the car has rolled
The M4 is the road which matters here, and runs under a mile from Winnersh. A wrongly fuelled diesel will usually take you onto it and some way along before anything seems wrong, and the symptoms when they arrive are usually a drop in power, a lumpy idle and smoke instead of a neat stop.
Never start it to reposition. Come off at the first sensible junction and turn off. On a longer run — anything close to the under 50 miles to the nearest city — assume the contamination has been through your filter, your pump and your injectors, and mention it when you phone. It changes what our technicians bring.
A little about Winnersh
Winnersh is a locality in Berkshire, situated on the banks of the River Loddon at an elevation of around 51 metres. Winnersh lies within the commuter belt, approximately 32.6 miles from London and 27.6 miles from Oxford, with nearby places including Merryhill Green, Sindlesham, and Emmbrook. Winnersh has a population of around 3115 people, predominantly living in detached housing.
Our call-out in Winnersh, step by step
- The answers shape the work, which is why our engineers ask before giving a price: what got in, how much of it, and if the motor has run.
- Your tank is drained of it.
- We purge the fuel lines and clean the filter, so what is remaining in the system is not what started the problem.
- We put new diesel in and bleed the system.
- Our technicians fire it up and confirm it runs smoothly on clean diesel.
The vehicle is then ready for you to pull away. We do all of this wherever the vehicle has ended up, which means it never needs to be taken to a workshop, and when it has been caught soon, it is very uncommon for there to be long-term damage.
AdBlue in your diesel tank by mistake, around Winnersh?
The problem is not the same, though the opening step is — don't crank it — if what went in was AdBlue rather than petrol. The lubrication a fuel system relies on is stripped away by petrol, which thins the diesel. Urea dissolved in water, AdBlue, and in a diesel tank that leads to corrosion and residue.
AdBlue removal in Winnersh has a page of its own with the detail on it, including why it's usually the more serious of the two. Our engineers deal with both.
What a petrol-in-diesel drain costs in Winnersh
Truthfully, no single number fits on a page like this. This job differs. Here's what moves it:
- This is the key one: whether your motor has been run, or driven.
- How much of the wrong fuel got in, compared with how much that tank can hold.
- The type of liquid in the tank, petrol or AdBlue.
- Where is it? And can our van reach it and work there safely?
The vehicle, the amount, whether it has run — give us those and the answer comes back straight instead of as a range. Not urgent, with your car at home and going nowhere? Then is fine.
Things our engineers hear about petrol in diesel in Winnersh
I am on a forecourt around Winnersh. Can you drain the car on the spot?
A large part of this work takes place there, so yes. Consent from the site is the condition. Given that, a forecourt like Shell is somewhere we're frequently, along with the rest of them locally — so name yours on the phone and you will hear if working there is possible.
Is there a safe quantity of petrol in a diesel?
It depends on the proportion instead of the litres, and a lot more on whether your engine has run. Five litres into an almost dry tank isn't five into a full one, no. But both land on the same query in the end: has that mixture been pulled right through, or has it not?
I put petrol in my diesel and drove the vehicle. Now what?
Stop somewhere safe, turn off, and keep the vehicle off. It is recoverable far more often than people fear, even though driving is what moves the issue from the tank into your pump and injectors — and the single most useful thing you can do now is not restart it.
My warranty — does a fuel drain void it?
It's not an alteration, so a drain and flush carried out correctly does not invalidate a manufacturer's warranty. A dispute over a warranty is likelier to come from running a diesel on petrol — so leave it turned off.
Can I just add two-stroke oil and drive home?
Two-stroke oil solves a different problem, and an old one at that. Nothing it does puts back what petrol diluted. No. The pump still has to put up with it, because your tank still has petrol in it later on.
Main dealers and petrol in a diesel
You don't need one. The vehicle is drained and cleaned wherever it is, with no need to take it to a dealership.
Still with the vehicle?
Do not switch the car back on.
Turn it off somewhere sensible and leave it off, if you have already driven it. This is recoverable from much more frequently than drivers assume, and a stationary, cold vehicle is the best position to be in.
Emptying misfilled vehicles, Winnersh and the rest of Berkshire, wherever they are. Roadside. Forecourt. Home.