The Mount: Put Petrol in a Diesel Car?
Do not start the motor. If the fuel is still in your tank and the motor has not yet been started, a drain is nearly always all it needs — and that's decided in the following few minutes, not by how much went in. Petrol in Diesel drains and cleans wrong-fuelled cars where they are, across The Mount and the remainder of Berkshire, on the forecourt, by the roadside or on a driveway. A single ring to us will be sufficient: our technicians can show you what follows after this. Make it first.
Petrol in a diesel: what to try first
- Do not crank it. Turned on all the same? Then don't believe it. Diesel in a petrol motor usually cannot run, so the motorist stops and the damage halts with them. Petrol in a diesel? It starts. It ticks over. It pulls away fine, for a couple of miles. People get that confused. It's not all right — the fuel system is wearing every mile you do.
- Diesel burns, and before it burns it lubricates — the high-pressure pump, its injectors. Petrol manages only the burning. So leave the car's ignition off too: turning it on is often all it takes to prime your system, and priming moves petrol from that tank into precisely those components.
- Topping up clears nothing. It leaves you a bigger tank of the same mixture, because a diesel fuel system does not accept petrol by percentage in the way that advice suggests — so never pour diesel on top to weaken it. Octane is beside the point too: super unleaded is petrol.
- Stay where you are if you sensibly can. A motor that has not moved is the easiest one to sort out, and our team would much rather travel to an awkward place than have it started. If you are parked on the verge on Southern Hill, put your hazards on and leave the car there.
- Check where you are before ringing. A postcode beginning RG1 5, and the name of whatever is closest to you. Otherwise the technician circles instead of arriving.
- Call 0333 366 0103. Let us know what got in, approximately how much, and if the engine has run. These three answers shape the entire job.
Quarter past eight. A hurried fill on the trip in. Close to eleven it hits you, and by then the diesel Volkswagen Golf has sat at Reading for three hours. Phone then keep the vehicle where it is. What is key is the journey in, as diesel both burns and — before that — lubricates the pump and the injectors, but petrol only ever combusts. Those few miles ran the pump on a fluid robbed of a lot of its protection, and no quantity of standing in a car park gives any of it back. Hence the thing we ask about distance rather than hours standing, and hence the advice to leave your keys be till our technicians arrive.
Someone will advise you to shift the vehicle out of that gateway and deal with it later. Do not. A misfuelled diesel BMW 3 Series on the zig-zags at Redlands Primary School is a hassle; the same vehicle restarted three more times to be helpful is a fuel system and not a tank. Every restart primes the fuel lines and pulls more petrol through the fuel filter and into your pump. Leave it there, let people complain, then phone us.
Don't chance it. The drive home from The Queen's Head is quite possible, which is exactly the trouble — a weakened tank doesn't stop a diesel starting or pulling away, it just wears the components your fuel is meant to protect. Call us, and let the Peugeot 308 stay where it stands.
Knocking? Lumpy idle? White smoke, throttle gone dead? That is your misfilled Audi A6, a diesel, saying what's wrong with it. Stop wherever you happen to be, perhaps close to 39 SportsPark, and leave the restarting alone.
A couple of streets, then it stopped. Throttle dead, idle uneven, and the diesel Kia Sportage is parked up near 253 SportsPark Pavilion. The motor isn't giving up — that softness is fuel that will not build pressure. There is no light on the dash for it, so cars like yours usually get driven again before somebody picks up the phone. Please don't. Off, then call us.
At a forecourt: removing petrol from the diesel
Plenty of this job begins at the pump, so a fair share of it gets done there. If you are still at the forecourt at BP, that is typically where the drain gets done — we operate on station forecourts all the time, with the owner's agreement.
Before the motor has started — a garage is the only place it ends up spotted. Our engineers can still deal with it where it is, even away from the forecourt. In a car park, on a driveway or in a lay-by, your car has been fired up and driven there, and that pulled fuel through your filter and into the high-pressure pump, all the way from the tank. None of that is a disaster, although the flush then has to go past the tank to your lines and the filter, and the few seconds between reading the receipt and reaching for the keys are what settle that.
The staff will generally happily push the car away from the petrol pump so the next motorist can get by. That's worth doing. Starting it to shift four vehicle lengths is not.
Can our technicians serve your side of The Mount?
Being a residential suburb, The Mount gets a routine visit, and the areas nearby go along on that same journey: Whiteknights and New Town, Whitley and Coley, Reading.
Our engineers do come. The places above are merely the closest neighbours, and a page is there for nearly all places around Berkshire, so an absence from the list isn't an absence from our coverage. Guessing is the mistake to avoid, above all on the border or anywhere your satnav fails. Call us to check.
The ground this page spans is on the map. We operate by the road, at forecourts, on driveways and in car parks across all of it, and your vehicle doesn't need to move to us.
The Mount: stranded where you stopped
Not everybody gets the chance to pull over somewhere suitable. Set off, then noticed? Landed along the verge of New Road, or stuck in some lay-by with the hazards on? That is a common call here. Not a rare one.
Safe where you are? Wait beside it. Not okay? Get out and clear of it. It will frequently oblige. A diesel running on petrol limps along perfectly willingly, and that's the problem: start it up to get to somewhere handier and the mix goes further into the fuel system with every mile covered. We will take the van to an awkward place without any fuss, and for the vehicle that is far better than carrying on.
Petrol in a diesel, but the vehicle has gone
The M4 is the one which matters now, and runs under 3 miles from The Mount. It will often get you onto it, and some way along, before you notice a thing. Then it is some smoke, an uneven idle and power draining away — not a neat stop. Wrongly fuelled diesels rarely give you one of those.
Come off at the next safe junction, turn off, and don't start the vehicle to move it. Long run? Anything close to the under 25 miles to the closest city and you should presume the lot — filter, pump, injectors, all of that reached by the contamination. Say that on the phone, since it changes what goes in the van.
About The Mount
The Mount is a suburban area in Berkshire, situated inland at an elevation of around 70 metres. The Mount lies within the larger urban landscape of Reading, near neighbourhoods such as Whiteknights and Whitley. The Mount is characterized by its predominantly flat-type housing, which reflects the area's relatively modern development. The Mount is also located near New Town, and is within commuting distance to Oxford and London.
What we do when our technicians reach you around The Mount
- The answers alter the work, which is why our technicians ask before giving a price: what got in, how much of that, and if your engine has run.
- The contaminated fuel is drawn out of the tank.
- Fuel lines are flushed through and the fuel filter cleared, leaving nothing in the system that caused any of this.
- Our engineers pour new diesel in and prime the system.
- Our technicians start it and confirm it runs correctly on new diesel.
The car is then ready for you to pull away. Long-term damage is very rare when it has been spotted quickly, and as all of this is done where your car is, it never has to go to a workshop.
A distinct job: AdBlue in a diesel tank in The Mount
AdBlue instead of petrol? Then the opening step is unchanged — the motor stays off — while this fault underneath it's a separate one altogether. The lubrication a fuel system depends on is stripped away by petrol, which thins the diesel. AdBlue is urea in water, and in a diesel tank it causes rust and deposits instead.
Our engineers handle both, and AdBlue removal around The Mount has its own page with the detail — including why it's usually the more significant of the two.
What a petrol-in-diesel fuel drain costs in The Mount
Our technicians can't put one number on this page frankly, since the job is not one job. What changes it:
- This is the big one: whether your engine has been started, or driven.
- The tank's capacity, set against how much of the wrong fuel went into it.
- The sort of fluid in the tank, petrol or AdBlue.
- Access: the car's position, and whether working on it there is safe for our van.
A straight answer rather than a range is what you get for telling us three things: the vehicle, the quantity, and if it has run. If it's not pressing — the car is at home and going nowhere — works too.
Petrol in diesel queries from The Mount motorists
I am on a forecourt around The Mount. Can you drain it on the spot?
A fair portion of this work takes place there, so yes. Consent from the site is the condition. Given that, a forecourt like Esso is somewhere we are frequently, along with the rest of them locally — so name yours on the call and you will hear if working there is possible.
A few litres of petrol in a diesel — too much?
Ratio settles it instead of litres — and more than either, whether the motor has run. A nearly empty tank with five litres in it, against a full one with the same five: distinct scenarios, certainly. Either way, the work needed comes down to one thing, which is whether the system has had that mixture sucked through it.
I put petrol in my diesel and drove the vehicle. Now what?
Turn off somewhere sensible, and keep it that way after you stop. Not restarting it is the single most helpful thing available to you now. Driving does move the trouble out of your tank then into your pump and injectors, yes, and it remains recoverable a lot more often than drivers fear.
My warranty — does a fuel drain void it?
A drain then flush carried out properly isn't a change and does not void 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?
No. Two-stroke oil is an old workaround for a distinct issue and it doesn't replace what petrol has diluted. Petrol remains in that tank later on, whatever else goes in, and the pump gets no reprieve from it.
Do I need a main dealer for petrol in a diesel?
You do not need one. The vehicle is drained and cleaned wherever it is, with no need to bring it to a main dealer.
You, and your car, still together?
Don't switch it back on.
Already driven it? Then stop somewhere sensible, turn off, and let the vehicle remain that way. A stationary, cold vehicle is the best position to be in, and this is recoverable from a lot more frequently than motorists expect.
Draining wrongly fuelled vehicles, The Mount and the rest of Berkshire, wherever they are. Kerbside. Forecourt. Home.