Put Petrol in a Diesel Car in Biscombe? Don't Start It
Do not turn on the motor. If the petrol is still in the tank and your engine has not yet been started, a tank drain is almost always all it takes — and that gets determined in the next few minutes, not by how much went in. Petrol in Diesel drains and flushes misfuelled cars where they are, all over Biscombe and the remainder of Somerset, on the forecourt, by the roadside or on a driveway. Ring us before all else happens, so you'll know what happens from there.
Now what? Petrol in a diesel, in turn
- Do not start it. Turned on all the same? Then never trust it. Diesel in a petrol vehicle generally will not run, so the driver stops and the damage halts with them. Petrol in a diesel? It starts. It idles. It drives off happily, for a couple of miles. Drivers get that reversed. It isn't all right — that fuel system is wearing down every mile you drive.
- Diesel burns, and before it burns it greases — your injection pump, its injectors. Petrol does only the burning. So leave the ignition alone also: flicking it on is usually all it takes to prime that system, and priming moves petrol from your tank into just those parts.
- Don't pour diesel on top to thin it. A diesel fuel system does not handle petrol by percentage as that guidance assumes, and topping up clears nothing — it only gives you a bigger tank of the same mixture. The octane makes no difference either: super unleaded is just petrol.
- Stay where you are if you reasonably can. A car that has not shifted is the simplest one to sort out, and we'd much rather get to an odd spot than have it started. If you're parked on the verge on Lillycombe Lane, put those hazards on then leave the car there.
- Before you ring, have your position. Anything nearest to you with a label on it, plus a postcode starting TA3 7 — that's what determines whether the technician turns up or circles.
- Dial 0333 366 0103. Let us know what was put in, about how many litres, and also whether the car has fired. Those three replies determine the entire call-out.
On the forecourt: clearing petrol from the diesel
Much of the work starts at a forecourt, so a good share of it gets finished on site. Still at Shell? Then that is generally where it gets done. Petrol station forecourts are normal for us, with the agreement of the station.
A forecourt is the one place the mistake gets spotted before the engine has run. Our engineers can still deal with it where it is, even away from the pumps. In a car park, on a driveway or in a lay-by, the vehicle has been switched on and driven there, and that pulled fuel through your filter then into the high-pressure pump, all the way from the tank. None of that is a disaster, though the flush then has to go past that tank to your lines and your filter, and the few seconds between reading the receipt and going for the key are what determine that.
Move the vehicle out of the way if the attendants offer, and they generally will. The next motorist gets past the petrol pump, and that's worth doing. Cranking it for four vehicle lengths? No.
Petrol in the Dacia Duster, and it takes diesel? Shopping in your boot, you at Waitrose, somewhere in Biscombe? Then ring us, and leave your engine out of that — not even to exit the bay. Somebody comes out to you. Tank cleared, fuel lines flushed, clean diesel in, and home you go. Light throttle over a mile pulls little, so these are usually the easy cases.
Twenty to nine outside Churchstanton Primary School, running late, and your receipt in your hand reads unleaded. Hazards on, ignition off, phone us. Three miles in the Peugeot 3008 feels like nothing, but a diesel pump supplies fuel to demand — while a frantic morning run needs plenty.
What we will want to know is whether the drive there was brief and cold, because that's where petrol is least likely to burn correctly — and anything that doesn't burn can slip past the rings and into the engine oil. Right up to the moment somebody takes it home, a diesel Audi A3 sitting in the parking area by the pub in the village holding a tank full of petrol in it is a straightforward job. Nothing worsens as it stands, and so leave the vehicle overnight and call us next morning.
Knocking? Uneven idle? White smoke, throttle gone dead? That's your wrongly fuelled Ford Kuga, a diesel, saying what's wrong with it. Stop wherever you happen to be, possibly near Saint Peter and Saint Paul, then leave the restarting alone.
What happens next is the problem. The motor at once sucks the petrol left sitting in your filter and the feed lines back round through the pump a second time, as draining a tank does nothing about fuel that has already left it. Drain it and put fresh diesel in, a person confident will tell you — and that tip is only half right, as do it to a diesel Mercedes A-Class parked up, St Andrew's say, and the thing starts, which is what makes it sound plausible. Ring us instead. We flush the circuit and take the filter off where the car has a serviceable one, and that is the difference between your car being repaired and the car just starting.
Biscombe plus the towns next to it
Being a small village, Biscombe gets a frequent visit, while the areas close by come with it on that same trip: Carlingwark and Stapley, Bolham Water and Willand, Rosemary Lane.
There are pages for most locations around Somerset, and the ones listed above are merely the nearest neighbours — so yours being absent from the list means nothing whatsoever about whether we come. Guessing is the thing to skip, particularly on a boundary or somewhere your phone gets lost. Contact us to ask.
The patch this page covers sits on the map. Your car never needs to move to us. We operate across the lot — roadside, forecourts, driveways, car parks.
Stranded by the kerbside in Biscombe
Not everyone has a chance to pull over anywhere sensible. Hazards flashing at a lay-by somewhere, or pulled onto the verge of Broad Street since you worked it out after setting off — our technicians take that call regularly enough that it is the normal kind.
Fine right there? Stay beside it. Not safe? Move out and away from it. Don't restart it to reach a safer spot. It'll go — a diesel on petrol generally obliges — and each mile of obliging draws the mixture deeper into your fuel system. However awkward the location, it is no bother for us to come to it, and that is far better for your car than pressing on.
So you've driven it? Petrol in a diesel after a couple of miles
The local M5 is the road that matters here, and it runs under 5 miles from Biscombe. Some way along, and onto it in the first place: a wrongly fuelled diesel will often do both before anything feels wrong. What you get then is seldom a neat stop. Power falls away, the idle gets rough, and there may be smoke.
Take the first junction that's safe, stop there, and do not restart the vehicle to move it. Long trip? Anything approaching the under 25 miles to the closest city and you should assume the lot — filter, pump, injectors, all of it arrived at by the mixture. Say that on the call, because it changes what goes in the van.
Biscombe itself
Biscombe is a small locality in inland Somerset, situated at an elevation of 178 metres, with detached housing being the predominant type of accommodation. Biscombe lies near the villages of Carlingwark and Stapley, and is close to Bolham Water, in a rural area of the South West region. Biscombe is approximately 20.5 miles from Exeter and 138.1 miles from London, making it a relatively remote community. Biscombe has a population of around 508 people, living in a scattered pattern of homes and farms.
What happens when our technicians get to you around Biscombe
- Our technicians ask first, quote after. What got in? How much? Has your motor run? Those responses change what the work really is.
- We drain that tank of all the tainted mixture.
- Lines cleaned, filter cleared. Whatever is left later on isn't the thing that created the trouble.
- New diesel goes in, and then the fuel system gets primed.
- After it is started, our engineers confirm it runs smoothly on new diesel.
That has the car ready to pull away. There is no need for a garage at any point, as the work is all done where the car is, and when it is caught soon, permanent damage is very uncommon.
AdBlue in the diesel tank by mistake, around Biscombe?
Never crank it: that first instruction applies whether what went in was AdBlue or petrol. What changes is the issue itself. Diluted diesel, and no lubrication left for your fuel system that relies on it. That is petrol. AdBlue is urea in water, and in a diesel tank it leads to rust and deposits instead.
We handle both, and AdBlue removal around Biscombe has its own page with the full story — including why it is usually the more significant of the two.
How much is a petrol-in-diesel fuel drain in Biscombe?
One figure wouldn't be fair here, because this is not one job. These are the things that change it:
- Started? Driven? Either answer matters more than anything else on this list.
- The tank's capacity, set against how much of the wrong fuel went into it.
- Which was put in: petrol or AdBlue.
- Where your vehicle is, and if a van can sensibly get to and work on it.
Tell us what your vehicle is, how much went in, and whether the engine has run. A straight answer comes back, not a range. Not time-critical, with the car at home and going nowhere? Then does the job.
Questions our technicians get about petrol in diesel around Biscombe
At a petrol station around Biscombe, can you do a fuel drain there?
A fair portion of this work takes place there, so yes. Tell us which one you're at when you phone and we will tell you if we can work there. With the site's consent we attend Monument Fuels and the other forecourts around town all the time.
A few litres of petrol in a diesel — too much?
Proportion decides it rather than litres — and more than either, whether the motor has run. What determines how much work is required is whether that mixture has been pulled through the fuel system — because though five litres in a nearly empty tank is a different case from five in a full one, either way that's the question.
I put petrol in my diesel and drove it. Now what?
Stop sensibly. Off. Nothing after that. Not restarting it is the single most helpful thing available to you now. Driving does shift the problem out of that tank and into the pump and injectors, yes, and it remains salvageable much more often than drivers fear.
Will a fuel drain void my warranty?
No. Carried out correctly, clearing and flushing is no modification at all, and the warranty from your manufacturer is untouched by it. A dispute over a warranty is likelier to come from running a diesel on petrol — so leave it switched off.
Can I just add two-stroke oil and drive home?
No. It belongs to a distinct fault from a different era, and petrol has diluted something no oil of that kind restores. Later on? Still petrol in your tank, and a pump that has to cope with the stuff.
Do I need a main dealer for petrol in a diesel?
No. Our engineers drain and flush the car wherever it is, so there's no need to take it to a dealership.
Is your car still with you?
Leave the engine switched off.
Already driven it? Then pull over somewhere sensible, switch off, then let the vehicle remain that way. Cold and stationary, a vehicle is in the best place available — and people fear this much more than the recovery rate warrants.
At the roadside, on the forecourt or at home — on-site fuel draining around Biscombe and throughout Somerset.