Put Petrol in a Diesel Car in Finchley? Don't Start It
Petrol in Diesel drains and cleans wrongly fuelled vehicles where they stand, on the forecourt, at the roadside or on a driveway, all over Finchley and the remainder of Greater London. The first thing to do is not to fire up the motor. While the motor has not been started and the fuel is still sitting in the tank, a fuel drain is almost always all it takes, and the following few minutes determine that, not how much was put in. Contact us so our engineers will explain what happens from here before you attempt anything else.
What to try first about petrol in a diesel
- Give a petrol engine diesel and it will normally not run at all, and so the driver stops there and so does the damage. Feed a diesel petrol and the thing starts, it ticks over, it pulls away — fine enough for a few miles. People have that muddled, which is the thing they get wrong about petrol in a diesel especially. So do not crank it. And once started, never trust it: that fuel system is grinding while you drive.
- Turning the car's ignition on often primes your system, and priming is what pulls petrol out of the tank and into the pump and injectors. Those are the parts diesel keeps lubricated on its way through, before it burns. Petrol handles the burning and none of the protecting. Leave the car's ignition be.
- Topping up removes nothing. It gives you a bigger tank of the same mixture, because a diesel fuel system does not tolerate petrol by percentage as that guidance presumes — so never put diesel on top to dilute it. Octane is beside the point too: super unleaded is petrol.
- A vehicle that has not moved is the simplest one to sort, and so wait where you are if you safely can. Parked on the verge on Regent's Park Road? Hazards on, and keep the car there. An awkward spot works for us better than a started diesel.
- Know where you are before phoning. A postcode beginning N3 2, and the name of whatever is closest to you. Otherwise our van circles instead of turning up.
- Dial 0333 366 0103. Let us know what got in, approximately how many litres, and if the motor has fired. These three replies shape the whole visit.
At a forecourt: clearing petrol from a diesel
The job starts at a pump, typically. Regularly it wraps up on site too. Still at BP? Then that is typically where it gets done. Petrol station forecourts are normal for us, with the permission of the site.
A forecourt is the one place the mistake gets spotted before the engine has fired. Everywhere else — a car park, a private drive, a lay-by — the car was fired up and driven to get there, which means fuel was drawn from your tank, through the filter and into your high-pressure pump. That is not a disaster, and we can still sort it out where it stands. It does mean your lines and your filter need cleaning as well as the tank, and that is decided by the few seconds between seeing the till receipt and going for the key.
Wheel it out of the way if the attendants offer, and they normally will. The next customer gets past the pump, and that is worth doing. Cranking it to roll four car lengths is not.
Car parks like the one at Little Waitrose are somewhere our engineers work in regularly, and the fuel is seldom the complicated part. That bay is: cars either side, a trolley shelter behind, at times a height limit on the way in that determines whether our van can access you at all. So tell us how penned in you are when you ring, and which way the vehicle is facing. Where we can't work alongside the diesel Nissan Qashqai we will shift the vehicle without running it — and that isn't pedantry about a couple of seconds of running. Any start primes that fuel system and sucks more of that mix out of that tank and on to the pump, and so a vehicle shuffled twice into a nicer bay has quietly become a bigger job than one left just where it stopped.
The components that should be getting oiled are grinding instead, and the vehicle gives no sign of it: a diesel on a weakened tank fires up and moves off perfectly well. Chance the journey home from King of Prussia? Not a chance. Call us then leave the Mercedes E-Class where it stands.
Our engineers purge the lines instead of only clearing your tank, and the reason is that thinned fuel has already arrived at the fuel filter and your pump: it was a start and a drive, however short. The hop genuinely assists — pulled off the forecourt, receipt read, a diesel BMW X1 parked up near St Mary's Court a couple of hundred yards later is about as well as this goes once the engine has turned. Call us and leave it off.
Petrol in a diesel does its harm as a share, which is the reason we ask at all: the same few litres sitting in an almost empty tank make a far stronger mix than they would in a full one. And petrol is rated on how well it withstands igniting under pressure — the opposite of what a diesel needs — so a stronger mix rattles more, smokes more, goes flatter. None of which means you need an answer ready. Almost nobody knows how full the tank was in a vehicle collected two days ago, and our engineers work that out there. Do call the hire or company firm first, though: some agreements want them to approve the work, and that is far quicker settled before than after. Then ring us about the Volkswagen Polo close to Barnet County Court.
A couple of streets, then it stopped. Throttle soft, idle lumpy, and the diesel Citroen C4 Picasso is parked up close to Church End Library. The motor isn't packing up — that sluggishness is fuel that will not build pressure. There is no light on the dash for it, and so cars like yours normally get driven again before somebody picks up the phone. Please don't. Off, and ring us.
Finchley plus the areas next to it
Those same journeys bring us to Church End, Holders Hill, North Finchley, Temple Fortune and Golders Green besides Finchley, which is a small village.
Not on the list? That says nothing. The places above are just the closest few, and nearly all towns in Greater London have a page of their own elsewhere on our site. Ring us and check rather than guessing — county lines particularly, and anywhere the satnav tends to get wrong.
The ground the page includes appears on the map. Roadside, forecourt, private drive, car park: every bit of that is ground our engineers serve, and none of it requires your car to travel to us.
Stuck by the roadside around Finchley
The chance to pull in somewhere suitable does not fall to everyone. Hazards flashing at a lay-by somewhere, or stopped on the verge on Lichfield Grove since you noticed after setting off — we take that call often enough that it is the normal kind.
Whether you stay by your car or keep clear of it turns on if sitting in it feels sensible. It will usually oblige. A diesel running on petrol limps along quite willingly, and that is the trouble: restart the vehicle to reach somewhere safer and the mix goes further into your fuel system with every mile covered. A van driving to a difficult place is no bother for us, and it's far better for your car than pressing on.
Petrol in a diesel, but the car has rolled
The M1 is the one which counts here, and it sits under 3 miles from Finchley. It will usually take you onto it, and some way along, before you feel a thing. Then it's some smoke, a rough idle and power falling away — not a tidy stop. Misfilled diesels seldom give you one of those.
Pull off at the first safe junction, turn off, and don't start the vehicle to move it. Long drive? Anything approaching the under 10 miles to the closest city and you should suppose the lot — filter, pump, injectors, all of that reached by the contamination. Say that on the call, because it alters what goes in the van.
A little about Finchley
Finchley is a locality in the London Borough of Barnet, situated near the River Brent and approximately 7 miles from central London. Finchley sits at an elevation of around 93 metres, with its residential areas comprising a mix of housing types, although flats are predominant. Finchley is close to other nearby places, including Church End, Holders Hill, and North Finchley, and is part of the wider north London urban landscape. Finchley has a population of around 5585 people, according to recent estimates.
What comes next when we get to you around Finchley
- We check what was put in, how much, and if the motor has run. The answers shape the work, which is why our engineers ask before giving a price.
- Out flows the tainted mixture.
- Fuel lines are flushed through and your filter cleared, leaving nothing in the fuel system that caused any of this.
- We pour clean diesel in and bleed the system.
- Our engineers turn it on and check it runs correctly on clean diesel.
Your car is then ready for you to pull away. Everything is done where the car is, so it never has to go to a workshop, and when it has been spotted quickly, long-term damage is very unusual.
Finchley AdBlue removal is a separate job
Do not crank it: that first instruction applies whether what was put in was AdBlue or petrol. What changes is this problem itself. Petrol does two things to diesel: weakens it, and removes the lubrication the fuel system relies on. Rust and build-up are what a diesel tank ends up with instead, as AdBlue is urea in water.
Frequently the more serious of the two, AdBlue — and the full story sits on its own Finchley page. Both are ours to deal with.
What a petrol-in-diesel drain will cost in Finchley
What shifts the price is set out below, as the job is not one job and our technicians can't honestly put a single figure on this page.
- Whether the motor has been started or driven. This is the key one.
- How much of the wrong fuel was put in, weighed against how much the tank holds.
- AdBlue or unleaded, whichever was put in.
- Where is it? And can a van get to it and work there sensibly?
The car, the quantity, whether it has run — give us those and the answer comes back straight instead of as a range. Vehicle at home, going nowhere, nothing urgent about it — is ideal for that.
Questions our engineers hear about petrol in diesel in Finchley
At a petrol station in Finchley, can you do a fuel drain there?
Yes — forecourts are where a good portion of this happens. Often, provided the site consents: Esso, plus every other forecourt nearby. Say on the phone where exactly you have stopped. Whether our technicians can work in that location is something we answer there and then.
A couple of litres of petrol in a diesel — too much?
Whether your engine has run counts a lot more, though the proportion matters too, rather than the litres. What determines how much work is needed is whether that blend has been sucked through the system — since though five litres in an almost empty tank is a different case from five in a full one, either way that's the question.
I drove it after putting petrol in my diesel. Now what?
Turn off somewhere safe, and keep it that way after you stop. It's recoverable much more regularly than motorists fear, even though driving is what moves the issue from that tank into the pump and injectors — and the single most valuable thing you can do now isn't restart it.
Is a fuel drain going to void my warranty?
A manufacturer's warranty withstands a drain and flush done to a proper standard, which is no alteration at all. Another reason to leave it switched off: running a diesel on petrol is the thing more likely to cause a dispute with one.
Could I put some two-stroke in and just drive?
What petrol has thinned isn't replaced by two-stroke oil, which is an old remedy for a different fault. So no. That tank still has petrol in it later on, and your pump still has to put up with it.
Main dealers and petrol in a diesel
You do not need one. The vehicle is drained and flushed wherever it is, with no need to bring it to a dealership.
Still with your car?
Do not switch the car on again.
If you have already driven the vehicle, pull in somewhere sensible, switch it off then leave it off. Cold, still, going nowhere: that is the best place to be in. Motorists fear this a lot more than they need to.
At the roadside, on the forecourt or at home — mobile fuel draining in Finchley and across Greater London.