Baydon: Put Petrol in a Diesel Car?
With that tank still holding the petrol and the motor not yet turned over, almost every job needs only a drain, so keep the motor off. That outcome is decided in the minutes right after filling up, rather than by the amount that went in. Throughout Baydon and the remainder of Wiltshire, Petrol in Diesel drains the car and flushes it where it sits, whether at a roadside, on a drive or at a forecourt. Our technicians will tell you what the next step is. Contact us — this comes ahead of all else.
What now? Petrol in a diesel, in turn
- Feed a petrol engine diesel and it will generally fail to run at all, and so the motorist stops there and so does the wear. Give a diesel petrol and the car starts, it ticks over, it pulls away — fine enough for a couple of miles. Most people have that muddled, which is the bit they get wrong about petrol in a diesel in particular. So never fire it up. And having started, don't rely on it: the fuel system is grinding as you drive.
- Diesel ignites, and before it burns it greases — the high-pressure fuel pump, its injectors. Petrol handles only the burning. So leave your ignition alone also: turning it on is often sufficient to prime the system, and priming draws petrol from that tank into precisely those components.
- Don't pour diesel on top to thin it. A diesel fuel system doesn't cope with petrol by percentage as that advice implies, and topping up gets rid of nothing — it only gives you a bigger tank of the same blend. The octane makes no difference either: super unleaded is still petrol.
- We would much rather drive to a tricky place than have it started — so if you safely can, stay put. Nothing is simpler to sort than a car that has not shifted. On the verge on Finches Lane, that means hazards on and keep it.
- A van arriving instead of circling turns on two things: a postcode starting SN8 2, and whatever is closest to you with a label on it. Have both prepared before you dial.
- What got in, about how many litres, and also whether your car has run — those three facts shape your whole job. Call 0333 366 0103 then tell us.
Draining petrol from your diesel at a forecourt
It begins at a forecourt, usually. Frequently it ends on site as well. If you're still on the forecourt at Shell, that is typically where this drain takes place — we operate on station forecourts regularly, with the station's consent.
At a garage, it gets caught with your motor never fired, and no place else manages that. Anywhere else — a car park, a drive, a lay-by — the vehicle was started and moved to get there, which means fuel was pulled from the tank, through the filter then into the high-pressure pump. That's not a calamity, and we can still sort it out where it sits. It does mean your lines and the fuel filter need flushing as well as the tank, and that is decided by the few seconds between checking the till receipt and going for the keys.
The attendants will usually happily roll the car out from the pump so the next customer can get by. That is worth doing. Shifting the car four spaces does not warrant firing the motor.
Baydon and the villages next to it
Being a rural village, Baydon sees a routine call, whilst its neighbours round about come along on the same run: Aldbourne and Marridge Hill, Lambourn Woodlands and Preston, Upper Lambourn.
Our engineers do come. Those places above are merely the closest neighbours, and a page exists for the majority of places around Wiltshire, so an absence from the list is not an absence from the coverage. Near the border, or somewhere your satnav can't find? Phone to check instead of guessing.
The ground the page covers is on this map. Every bit of that is territory we cover: a roadside, a forecourt, a driveway, a car park. You don't drive your car anywhere.
Twenty to nine by Baydon St Nicholas Church of England Primary School, running late, and the receipt in your hand reads unleaded. Hazards on, motor off, phone us. Three miles in your Dacia Duster sounds like nothing, but a diesel pump supplies fuel to demand — and a rushed morning dash demands plenty.
Leave it overnight. Phone us first thing. Nothing about a diesel Vauxhall Astra standing in the parking area outside the pub in the village degrades as it waits, tank of petrol or not, and this job remains a straightforward one right up till the moment it gets taken home. The query our technicians bring is about that run there: a cold motor over a short distance is where petrol ignites least well, and whatever fails to burn can work its way past the piston rings into the oil.
Injection pressure is the thing being lost. Petrol weakens diesel, and thinner fuel leaks past the close-fitting parts that are supposed to build that pressure, and so the farther a diesel Audi A6 drove, the less well it held. Normal on the way out and gutless on the way back is how the drive to St Nicholas School Playing Fields went, then, and the tank is the place to look. Pull over somewhere sensible, switch off then call us.
About as well as this goes, once the engine has turned: away from the pumps, receipt read, and your diesel Ford Kuga left close to St Nicholas hardly two streets on. Call us, then leave it off. A short distance does truly help. It was still a start and still a drive, though, and so the filter and your pump have had diluted fuel through them — hence rinsing your lines rather than only clearing your tank.
Fixed and starting are not the same thing, and the difference is the system: our technicians flush it, and take the filter off where there is a serviceable one. Compare that with the sure of themselves advice you'll get — drain it, refill with new diesel. Half right. Do precisely that to a diesel Kia Sportage near Methodist Church and it'll start, which is exactly why the advice sounds sensible. Then the engine sucks the petrol left behind in your filter, and in the feed lines, straight back through the pump, because draining a tank does nothing whatever about fuel that has already left it. Call us instead.
Stopped at the kerbside anywhere in Baydon?
The chance to pull over somewhere sensible doesn't come to everyone. Hazards going at a lay-by somewhere, or stopped on the verge on Ermin Street as you realised after setting off — we take that call so often that it is the usual kind.
Clear of the vehicle if it isn't sensible to sit there, with it if it is. Every mile a diesel obliges you for on petrol draws that blend further into your fuel system — and oblige it usually will, which is why the motor doesn't get restarted to limp somewhere handier. However inconvenient the location, it is no trouble for us to get to it, and that is far better for the car than pressing on.
Run it already? Pull over, and check this
Here is where the M4 counts, under a mile away from Baydon. It will often take you onto it, and some way along, before you notice a thing. Then it is some smoke, a lumpy idle and power ebbing away — not a neat stop. Misfilled diesels seldom give you one of those.
The first safe exit is the one to take. Switch off there, and leave the restarting alone. It alters what our technicians bring, so mention it when you ring: on a longer trip — anything approaching the under 25 miles to the closest city — assume the contamination has been through your filter, the pump and your injectors.
A bit about Baydon
Baydon is a rural village in north Wiltshire, situated at an elevation of around 230 metres, with detached housing being the predominant type. Baydon lies near the villages of Aldbourne and Lambourn Woodlands, and is surrounded by scenic countryside. Baydon is located approximately 22 miles from Oxford and 63 miles from London, making it a relatively remote but accessible community. Baydon remains a small, quiet village with a population of around 656 residents.
What we do when our engineers get to you in Baydon
- The answers shape the work, which is why we ask before quoting: what got in, how much of that, and if the motor has run.
- Our engineers empty the tank of all the tainted fuel.
- What is left in the fuel system should not be what caused the trouble, and so the lines get cleaned and the fuel filter cleared.
- The fuel system gets bled, on clean diesel.
- Once it's started, our engineers confirm it runs smoothly on clean diesel.
Your car is then ready for you to drive away. All of this is done where your car is, so it never needs to go to a garage, and when it has been spotted early, lasting damage is very rare.
Baydon AdBlue removal is a different job
If what was put in was AdBlue instead of petrol, the opening rule is the same — don't crank it — but the issue is not. The lubrication a fuel system relies on gets taken away by petrol, which dilutes the diesel. AdBlue? Urea dissolved in water. Pour that in with your diesel and you get corrosion instead, plus residue.
We deal with both, and AdBlue removal around Baydon has its own page with the details — including why it's usually the more significant of the two.
Paying for a petrol-in-diesel drain around Baydon
Our technicians cannot put one figure on this page honestly, as this job isn't one job. What moves it:
- Has it been run or driven? Nothing else matters for as much.
- The tank's capacity, set against how much of the wrong fuel went into it.
- Whether it is petrol or AdBlue.
- Where is it? And can our van reach it and work there safely?
The vehicle, the quantity, whether it has run — give us those and the answer comes back firm and not as a range. For the vehicle at home that is going nowhere and isn't urgent, is fine too.
Baydon motorists ask us these about petrol in diesel
Can you do a fuel drain at a petrol station in Baydon?
A good part of this work happens there, so yes. Permission from the site is the condition. Given that, a forecourt like another forecourt nearby 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.
How much petrol is too much for a diesel?
Litres aren't the yardstick. Proportion is, and far more than either, it matters if anything has been run. Five litres in a nearly empty tank is a different case from five in a full one — but either way, the thing that determines how much work is required is if that mix has been sucked through the fuel system.
Petrol in my diesel, and I have driven it
Stop safely. Off. Nothing after that. It is salvageable far more frequently than drivers expect, even though driving is what takes the trouble from your tank into your pump and injectors — and the single most valuable thing you can do now is not restart it.
Will a fuel drain void my warranty?
It isn't an alteration, so a drain then flush carried out properly does not invalidate a manufacturer's warranty. Another good reason to leave it switched off: running a diesel on petrol is the thing likelier to cause an argument with one.
Two-stroke oil in the tank, and then home?
No. It belongs to a distinct problem from a different era, and petrol has thinned something no oil of that kind replaces. The pump still has to put up with it, because the tank still has petrol in it afterwards.
Main dealers and petrol in a diesel
You do not need one. The car is drained and flushed wherever it is, with no need to take it to a main dealer.
Is the car still with you?
Turned off is how the car stays.
Turn it off somewhere safe then leave it off, if you have already driven it. Cold and stationary, a vehicle is in the best position available — and people fear this a lot more than the recovery rate warrants.
Emptying misfilled vehicles, Baydon and the rest of Wiltshire, wherever they are. Kerbside. Forecourt. Home.