Put Petrol in a Diesel Car in Roborough? Don't Start It
If you have not fired up your engine yet, don't. A fuel drain and nothing more is almost always what a car requires while the fuel is still sitting in the tank and the motor has not yet been started, which is why it is the coming few minutes that matter, not how much got in. Petrol in Diesel comes to your car wherever it has ended up in Roborough or the rest of Devon, on the forecourt, by the roadside or on a driveway, and drains and cleans it there. Ring us so our team will show you what happens next before you attempt any more.
Petrol in a diesel: what to do next
- Feed a petrol motor diesel and it will normally fail to run at all, and so the motorist stops there and so does the harm. Feed a diesel petrol and the engine starts, it idles, it moves off — all right for a few miles. Motorists have that muddled, which is the part they get wrong about petrol in a diesel in particular. So never start the vehicle. And if started, do not trust it: the fuel system is wearing down whenever you drive.
- Two jobs, diesel: it burns, and on the way through it keeps your injection pump and injectors protected. Petrol only handles the one. That is why your ignition is left off also — turn it on and you frequently prime the system, and that is petrol leaving your tank for precisely those components.
- That guidance supposes a diesel fuel system handles petrol by percentage. It doesn't. Pour diesel on top and nothing at all is cleared; what you end with is a fuller tank of the same mixture. And no, the grade makes no difference — super unleaded is still petrol.
- We'd rather drive to a difficult place than have it started — so if you safely can, sit tight. Nothing is simpler to sort than a motor that has never moved. On the verge on Broadley Park Road, that means hazards on and keep it.
- Know where you are before phoning. A postcode that starts PL6 7, and the name of whatever is nearest to you. Otherwise the van circles instead of turning up.
- Three answers determine the entire visit: the liquid you put in, the approximate measure involved, and if anything has been going since. Our number is 0333 366 0103.
Pump-side drains for petrol in a diesel
A good share of the job gets finished at the pump, since that is where it mostly begins. Our technicians work on petrol station forecourts all the time, with the owner's consent, and so if you're still at Tesco that is usually where this drain happens.
At the forecourt, it is stopped with the engine never fired, and no place else does it. The few seconds between reading the receipt and reaching for the keys determine how much needs rinsing. Anywhere other than a forecourt — a car park, a private drive, a lay-by — the car was started and driven to get there, so fuel was pulled from your tank, through your filter then into the high-pressure fuel pump. That means the lines and the filter require rinsing as well as your tank. It's not a calamity, and we can still sort it out where the car sits.
Staff will usually chip in pushing it away from the pump, which lets the next motorist get past. Take the offer. Four vehicle lengths is not worth a start.
Roborough and the places beside it
As a rural hamlet, Roborough has a frequent visit, while the areas round about go along on the same journey: Belliver and Widewell, Woolwell and Bickleigh Down, Southway.
We still come. Those places above are only the nearest neighbours, and a page exists for most locations in Devon, so an absence from the list isn't an absence from the coverage. Call us and ask rather than assuming — boundaries especially, and anywhere the satnav may misread.
This map is the ground this page includes. Our technicians work at the roadside, at forecourts, on driveways and at car parks over all of that, and the vehicle doesn't need to travel to us.
Nothing warns you, since from the driver's seat there's nothing to be warned about. Your diesel Skoda Octavia will have seemed entirely usual on the way back from Widewell Primary Academy, and they all do — which is the trap with petrol in a diesel instead of the reverse. Diesel in a petrol motor generally refuses to run, stopping the motorist and stopping the wear with them. Petrol in a diesel fires up, idles, drives off as though nothing had happened, and all the while the pump works without the protection its fuel is supposed to supply. Tell us about how far, and how hard. The harder matters more.
The parts that should be getting oiled are grinding instead, and the vehicle gives no sign of that: a diesel on a weakened tank fires up and moves off quite happily. Risk the trip home from Lopes Arms? Not a chance. Phone us then leave the Peugeot 308 where it is.
Diesel has to be heavy enough to seal the close-fitting parts it passes through, and petrol dilutes it. That's the whole mechanism, and it accounts for the ordinary Roborough Playing Fields call: a diesel Nissan Qashqai that drove out there without a murmur and came back down on power, lumpy at idle, maybe smoking a little. A diesel injection system works hydraulically as well as chemically — it requires your fuel to hold pressure, not merely to burn — so when your fuel dilutes, pressure that should build and stay built starts leaking past clearances instead, and the engine gets a poorer, later, less even delivery than it was built about. None of that is the engine failing, which is the part worth hearing: it's your fuel no longer acting like diesel, and it stops when the fuel is sorted.
Three things help when you ring from close to Roborough Village Hall: which side the filler is on, whether our van can pull up beside without blocking the road, and whether the engine has run since you filled up. On-street is the usual place we work, and so the spot itself is hardly ever the issue — we would far rather deal with a tight parking bay than with a vehicle that has been driven to somewhere more handy. We'll drain the Audi A4, change the fuel filter where there is a serviceable one, flush the lines then put fresh fuel through the whole system, as by this point the worst of that is waiting in the fuel lines rather than in the tank.
By this point the tank isn't where most of the damage is. Once a diesel has run, that mix is in the fuel filter, the lines, the pump and the rail — and it doesn't come back out with your tank contents. A diesel Mercedes C-Class that got near St Anne needs the system cleared, not drained.
Stuck by the kerbside in Roborough
Not everybody finds a decent spot to pull in. Set off, then noticed? Landed on the verge beside Tamerton Road, or stuck in some lay-by with your hazards going? That's a common call here. Not a rare one.
Wait by the car when it's safe to wait there, but clear of it if it isn't. Never start up your engine to nurse the vehicle somewhere better — a diesel running on petrol will usually oblige, and every mile it obliges for is pulling the mixture further into the system. We will bring our van to an awkward place without any fuss, and for the vehicle that's far better than carrying on.
So you've run it? Petrol in a diesel over a few miles
This is where your M5 comes into it — under 50 miles away from Roborough. Some distance along, and onto it in the first place: a wrongly fuelled diesel will frequently manage both before anything seems wrong. What you get then is rarely a clean stop. Power drains away, the idle turns rough, and there may be smoke.
The first sensible junction is the one to take. Switch off there, then leave the restarting alone. On a longer drive — anything near the under 10 miles to the nearest city — take it the petrol has been through your filter, the pump and the injectors, and say so when you phone. It changes what our technicians bring.
Where is Roborough?
Roborough is a small hamlet situated near the coast in Devon, with a population of around 560 people and predominantly detached housing. Roborough sits at an elevation of 144 metres, close to the city of Plymouth, which is approximately 5.4 miles away. Roborough is surrounded by other nearby places, including Belliver, Widewell, and Woolwell, and is located within the South West region of England. Roborough is also relatively distant from London, at around 188.4 miles away.
Our call-out in Roborough, step by step
- Three things get asked before any price — your fuel that was put in, the amount, and if anything has been run since. Each answer shapes the work.
- The tainted mixture comes from your tank.
- Fuel lines are purged through and the fuel filter cleaned, leaving nothing in the fuel system that started any of this.
- New diesel goes in, and then the system gets primed.
- Our technicians start the engine and check it runs smoothly on fresh diesel.
The vehicle is then ready for you to drive away. All of it is done where your car is, so it never has to go to a garage, and when it has been caught early, permanent damage is very unusual.
AdBlue in your diesel tank instead, around Roborough?
AdBlue rather than petrol? Then the opening instruction is unchanged — the engine remains off — whereas the problem beneath it is a distinct one altogether. Diluted diesel, and no protection left for the system that depends on it. That's petrol. AdBlue is urea in water, and in a diesel tank it brings corrosion and residue in its place.
Our engineers handle both, and AdBlue removal in Roborough has its own page with the full story — including why it's frequently the more serious of the two.
Roborough prices for a petrol-in-diesel drain
Honestly, no single figure belongs on a page like this. The job varies. Here's what moves it:
- Started? Driven? Either answer matters more than anything else on this list.
- How much of the wrong fuel went in, against how much the tank holds.
- Which was put in: unleaded or AdBlue.
- Access: the car's position, and whether working on it there is safe for our van.
Tell us the car, the amount and whether it has run, and you'll get a clear answer rather than a range. Vehicle at home, going nowhere, nothing time-critical about it — is ideal for that.
Questions we hear about petrol in diesel around Roborough
I am on a forecourt around Roborough. Can you drain the vehicle here?
A large portion of this work takes place there, so yes. Regularly, provided the site consents: Texaco, plus every other forecourt nearby. Say on the phone where precisely you have stopped. Whether our engineers can work in that spot is something our engineers answer straight away.
A few litres of petrol in a diesel — too much?
Whether the engine has run counts much more, though the ratio matters too, instead of the litres. What settles how much work is required is if that mixture has been drawn through the fuel system — since even though five litres in a nearly empty tank is a distinct matter from five in a full one, either way that's the query.
Already driven it with petrol in your diesel? What now?
Switch off somewhere safe, and keep it that way after you stop. It is salvageable a lot more often than people expect, even though driving is what takes the issue from the tank into your pump and injectors — and the single most valuable thing you can do now isn't restart it.
Fuel drains and manufacturer warranties
It is not a modification, and so a drain then flush carried out correctly does not void a manufacturer's warranty. What's likelier to start a dispute is a diesel that has been run on petrol. One more good reason for your engine to stay off.
Can I just add two-stroke oil and drive home?
What petrol has thinned is not put back by two-stroke oil, which is an old remedy for a different fault. So no. Your pump still has to cope with it, as the tank still has petrol in it later on.
Do I need a main dealer for petrol in a diesel?
Wherever the car is, we drain and clean it there, so a trip to the main dealer does not come into it.
Standing next to it?
Turned off is the way the car remains.
If you have already driven it, pull over somewhere safe, turn it off then leave it off. Cold, stationary, going nowhere: that is the best place to be in. Drivers fear this a lot more than they need to.
Across Devon and around Roborough: call-out fuel draining, at home or on the forecourt or at the roadside.