Wawcott: Put Petrol in a Diesel Car?
With that tank still holding the petrol and your engine not yet turned over, almost every job requires only a drain, so keep your engine off. That result is determined in the minutes straight after the fill-up, and not by the amount that went in. Across Wawcott and the remainder of Berkshire, Petrol in Diesel drains the vehicle and cleans it where it is, whether by a roadside, on a driveway or at a forecourt. Call us and our engineers will show you what happens after that before you attempt any more.
What to do now about petrol in a diesel
- Do not crank it — and never trust it if it fires up. That is the thing motorists have wrong about petrol in a diesel specifically. A petrol motor fed diesel typically just won't run, and so the driver stops and the wear stops with them. A diesel filled with petrol generally starts, ticks over and drives off quite happily for a couple of miles. It's not fine. It's eating into that fuel system whenever you drive.
- Two jobs, diesel: it ignites, and on the way through it keeps the high-pressure fuel pump and injectors oiled. Petrol only manages the one. That is why the ignition remains off also — switch it on and you often prime that system, and that's petrol exiting the tank for just those components.
- That guidance supposes a diesel fuel system accepts petrol by percentage. It will not. Pour diesel on top and nothing at all is cleared; what you end with is a bigger tank of the same mix. And no, the octane makes no difference — super unleaded is still petrol.
- We'd rather travel to an awkward location than have it started — so if you sensibly can, stay put. Nothing is simpler to sort out than a car that has never moved. On the verge on A4, that means hazards on then keep it.
- Before you call, work out your position. Anything nearest to you with a name on it, plus a postcode starting RG20 8 — that's what settles whether the van shows up or circles.
- Dial 0333 366 0103. Tell us what was put in, about how much, and if your car has started. Those three replies shape the full job.
Forecourt drains for petrol in a diesel
The job kicks off at a pump, usually. Quite often the job wraps up there as well. If you are still on the forecourt at Shell, that is usually where this drain takes place — we work on garage forecourts all the time, with the station's consent.
A filling station is the only spot this gets caught before the engine has fired. The few seconds between checking the receipt and reaching for the keys settle how much needs cleaning. Anywhere other than the forecourt — a car park, a private drive, a lay-by — your car was started and moved to get there, so fuel was drawn from your tank, through the fuel filter and into the high-pressure fuel pump. That means your lines and the filter require flushing as well as your tank. It's not a catastrophe, and we can still sort it out where your car stands.
Away from the petrol pump, the next motorist can get through — so yes, let the attendants help you roll the car. Well worth doing. Shifting it four lengths does not warrant cranking the engine.
Wawcott and the areas beside it
Being a small village, Wawcott sees a routine visit, while the areas close by come with it on the same round: Elcot and Halfway, Hoe Benham and Kintbury, Clapton.
Not on that list? That says nothing. The names above are only the closest few, and the majority of towns across Berkshire have a page of their own somewhere on the site. Close to the border, or somewhere the satnav can't find? Call us and ask instead of assuming.
Check the map for the ground shown on this page. Roadside, forecourt, driveway, car park: all of that is ground our engineers cover, and none of it asks the car to move to us.
How far, and how hard? The second of those counts more than the first, so have both prepared. Your Audi A4 will have seemed completely ordinary on the way back from Kintbury St Mary's C.E. Primary School — they all do, and that is the catch. Diesel into a petrol vehicle usually won't run at all: the driver stops, and so does the harm. Petrol into a diesel fires up, idles, moves off like nothing happened, whilst the high-pressure fuel pump gets on with its work minus the protection your fuel should be giving it. No warning appears, because behind the wheel nothing appears wrong.
It will start. It will drive off perfectly well. That is the problem, as a diesel on a thinned tank runs generally while wearing the parts its fuel should be protecting. So no, never chance the drive home from The Halfway Inn — leave the Mercedes C-Class and call us.
Don't drive it home to buy yourself time. You already have it: nothing gets worse while your car waits, since a diesel BMW 5 Series left outside Kennet Valley Alderwoods is doing none of what it did on the way there. Your pump has stopped turning.
Leave the Kia Sportage near Kintbury then phone us. We are blunt about not driving on as a worn-out pump sheds, and what it sheds moves onward with your fuel to your injectors downstream.
Hire car? Company car? Ring them before us. Some contracts want the firm to approve the work, and that is much faster dealt with up front than later. Then call us about the Vauxhall Insignia, the diesel one, close to Parish church of Saint Mary the Virgin, Kintbury. Do not worry that you can't say how full the tank was — almost no one can two days into a motor, and it is something our engineers establish there. The reason for asking: damage from petrol in a diesel is a matter of ratio. A couple of litres in a nearly empty tank make a far stronger blend than in a full one, and petrol is built to resist the very thing a diesel needs of it, which is igniting when compressed. Stronger mix, more knocking, more smoke, flatter throttle.
Roadside stops across Wawcott
The opportunity to pull in somewhere safe doesn't fall to everyone. A normal call for us and not an odd one: realised after setting off, ended up along the verge beside Station Road or at a lay-by with the hazards on.
Clear of your car while it's not safe to be in it, with it if it is. Every mile a diesel obliges you for on petrol draws that mixture further into the fuel system — and oblige it frequently will, which is why your motor does not get restarted to limp somewhere safer. We will bring our van to an awkward location without any bother, and for the vehicle that's far better than carrying on.
So you've run it? Petrol in a diesel after a couple of miles
Here is where the local M4 comes in — under 3 miles away from Wawcott. Some way along, and onto it in the first place: a misfilled diesel will frequently manage both before anything seems wrong. What you get then is rarely a neat stop. Power drains away, your idle gets uneven, and there may be smoke.
Take the first junction that is safe, stop there, and do not start the vehicle to reposition. Presume the worst of that on a long trip. Anything approaching the under 25 miles to the closest city, and the mixture has been through the filter, through your pump, through the injectors. Say so when you phone. What we bring alters.
Wawcott itself
Wawcott is a small locality in Berkshire, situated on the banks of a river at an elevation of around 100 metres. Wawcott lies near the villages of Elcot and Halfway, and is within commuting distance of Oxford, which is approximately 24 miles away. Wawcott has a population of around 549 people, predominantly living in detached houses. Wawcott is also relatively close to London, being about 56 miles west of the city.
The job around Wawcott, step by step
- The responses change the work, which is why our technicians ask before giving a price: what was put in, how much of that, and whether your engine has run.
- We drain that tank of all the polluted mixture.
- Lines purged, filter cleaned. Whatever is left afterwards is not the thing that created the issue.
- Bleeding your system follows, once fresh diesel is in.
- We turn it on and confirm it runs smoothly on clean diesel.
After that it is ready to set off. Everything is done where your car is, so it never has to be taken to a workshop, and when it has been caught early, permanent damage is very uncommon.
Wawcott AdBlue removal is a separate matter
The issue is not the same, though the first step is — don't fire it up — if what went in was AdBlue instead of petrol. Petrol dilutes the diesel and removes the protection your fuel system relies on. AdBlue is urea in water, and in a diesel tank it leads to corrosion and deposits in its place.
Frequently the more significant of the two, AdBlue — and the full story lives on its own Wawcott page. Both are ours to deal with.
What a petrol-in-diesel drain costs in Wawcott
Honestly, no single price fits on a page like this. This job differs. Here's what varies it:
- Whether your motor has been started or driven. This is the key one.
- How much of the wrong fuel got in, against how much your tank holds.
- AdBlue or petrol, whichever got in.
- Where the car is, and whether a van can sensibly get to and work on it.
The car, the quantity, whether it has run — give us those and the answer comes back firm and not as a range. For your car at home that's going nowhere and isn't time-critical, is fine too.
Wawcott motorists ask us these about petrol in diesel
Can you do a fuel drain at a petrol station around Wawcott?
Plenty of what our engineers do takes place nowhere else. So yes. Our engineers visit Asda and the other forecourts locally all the time, with the site's permission — tell us which one you are at when you ring and we will tell you whether our engineers can work there.
A couple of litres of petrol in a diesel — too much?
Litres are not the yardstick. Ratio is, and a lot more than either, it counts if anything has been run. Five litres into an almost dry tank is not five into a full one, no. But both land on the same query in the end: has that mix been pulled right through, or has it not?
I put petrol in my diesel and drove the car. What next?
Stop sensibly. Off. Nothing after that. Driving takes the issue along — out of your tank, into your pump and injectors. People fear it a good deal more than the recovery rate warrants, mind. The one genuinely valuable thing left to you is not restarting it.
Will a fuel drain void my warranty?
No. Carried out properly, draining and rinsing is no alteration at all, and the warranty from your manufacturer is unaffected by it. What is likelier to start a dispute is a diesel that has been run on petrol. One more good reason for the engine to remain off.
Two-stroke oil in that tank, and then home?
Two-stroke oil solves a separate fault, and an old one at that. Nothing it does puts back what petrol diluted. No. Afterwards? Still petrol in that tank, and a pump that has to put up with the stuff.
A main dealer for petrol in a diesel — essential?
There is no need to take it to a franchised dealer, as our technicians drain and clean the car wherever it is.
You, and your vehicle, still together?
Turned off is the way it stays.
Already driven it? Then pull over somewhere safe, turn off, then let it stay that way. Cold, still, going nowhere: that is the best position to be in. People fear this far more than they need to.
Throughout Berkshire and in Wawcott: on-site fuel draining, at home or on the forecourt or at the roadside.