Wittering: Put Petrol in a Diesel Car?
Do not fire up the engine. While the petrol is still in that tank and the engine has not been started, a tank drain is almost always all it needs — and that gets decided in the next few minutes, not by how much was put in. Petrol in Diesel drains and cleans wrong-fuelled cars where they stand, across Wittering and the remainder of Cambridgeshire, on the forecourt, by the roadside or on a drive. Our engineers will explain what the next move will be. Ring us — that goes before everything else.
What now? Petrol in a diesel, in order
- While you drive, your pump and the injectors wear down. That's why you do not fire it up, and why you do not believe it once it has started. The trick about petrol in a diesel especially — the part most people get wrong — is that it drives away fine for the first mile or two. Diesel in a petrol engine typically won't run at all, which stops the motorist and stops the wear with them. This one lets you carry on.
- Flicking your ignition on commonly primes that system, and priming is what moves petrol out of your tank and into your pump and injectors. Those are the components diesel keeps lubricated on its way through, before it ignites. Petrol does the burning and none of the protecting. Leave the ignition alone.
- Topping up takes out nothing. It leaves you a larger tank of the same mix, because a diesel fuel system does not accept petrol by percentage the way that guidance suggests — so do not tip diesel on top to water down it. Type is immaterial too: super unleaded is petrol.
- Stay still if it's wise to. Hazards on, motor off, leave the vehicle. Wherever you have stopped — the verge on Church Road, anywhere — a tricky place for us is better than a started engine, and nothing is simpler for us to sort than a car that never shifted.
- The van showing up rather than circling hinges on two things: a postcode that starts PE8 6, and whatever is next to you with a sign on it. Get both ready before you phone.
- Dial 0333 366 0103. Say what got in, about how much, and if the motor has run. These three replies decide the entire job.
Petrol in a diesel Volkswagen Passat, sat outside Stamford since breakfast? The afternoon has cost you nothing — fuel in a tank is inert. It was the drive in that drew thinned diesel through the pump. Phone before you move the car.
The awkward part is the bay, not the fuel. Motors either side of you, a trolley shelter behind, and now and then a height barrier on the way in that determines whether a van can get to you at all — so when you ring from a car park like the one at M&S Foodhall, mention how much room there is around you and which way round your car is. Those our technicians visit regularly. Should there be no room to work alongside your diesel Nissan Qashqai, it gets moved with your engine off, and not out of fuss over a few seconds of running: priming happens at every start, more of that mix exits your tank for the pump, and two shunts into a nicer space have silently made a harder job of what was simply a car sitting still.
Your diesel Peugeot 3008 will have felt perfectly normal on the way back from Wittering Primary School. They do, and that is the snag with petrol in a diesel instead of the other way round. Put diesel in a petrol motor and it mostly will not run, so the driver stops and the wear stops with them. Put petrol in a diesel and it starts, idles and pulls away as though nothing has happened — all while your high-pressure pump works without the lubrication the fuel is meant to be supplying. Nothing alerts you, as from the driver's seat there is nothing to warn you about. Phone us with roughly how far you went and how hard you drove it; the second answer matters more than the first.
Happy on the way out, sluggish on the way back. If that's how that run to Little Wood went, that tank is where to look. Petrol dilutes diesel, and runnier fuel seeps past the precision parts that are meant to build injection pressure — so the further the BMW 5 Series travelled, the less well it held that pressure. Stop somewhere safe, switch off then phone us.
Emptying the Ford Kuga, changing your filter where there's a usable one, cleaning your lines, putting clean fuel through the whole circuit: that's the job, and it's shaped by the worst of it sitting in the lines rather than in that tank by this point. Three things help when you ring from near Wittering Parish Hall — which side the filler is on, whether our van can park next to without blocking the road, and if the engine has run since you filled up. On-street is the most common place we work, and so the place itself is seldom the trouble. A tight parking spot beats a car driven somewhere more convenient.
On a forecourt: draining petrol from your diesel
Plenty of this job begins at the pump, which means a good share of that gets done there. If you're still at the forecourt at BP, that's normally where the drain happens — we operate on petrol station forecourts all the time, with the owner's permission.
A forecourt is the one setting this gets caught before the engine has run. Fuel pulled out of your tank and through your filter, all the way to your high-pressure pump, is what occurs when your engine is fired up and the vehicle is driven to where it is now: the car park, the driveway or the lay-by, everywhere other than the forecourt. So the flush takes in the filter and your lines along with the tank. That's still not a calamity, and we sort it out where the vehicle sits. What settles it is whether the key was turned in the seconds after the receipt was read.
Attendants will normally chip in pushing it clear of the petrol pump, which lets the next driver get by. Welcome the help. Four vehicle lengths is not worth a restart.
Wittering plus the villages beside it
The same runs bring us to Thornhaugh, Southorpe, Pilsgate, Barnack and Wansford along with Wittering, which is a rural village.
Not on the list? That says nothing. The names above are only the closest few, and most towns in Cambridgeshire have a page of their own elsewhere on our site. Phone to check rather than guessing — county lines particularly, and anywhere your satnav can misread.
Use our map for the area covered here. Roadside, forecourt, driveway, car park: every bit of that is ground we serve, and none of that requires the car to move to us.
Wittering: broken down wherever you parked
The opportunity to pull in somewhere suitable does not come to everybody. Hazards going at a lay-by somewhere, or pulled onto the verge on The Limes since you noticed after setting off — our engineers take that call regularly enough that it's the normal kind.
Stay by your car while it's sensible to be there, but out of the vehicle if it isn't. Never restart your motor to nurse the car somewhere better — a diesel running on petrol will frequently oblige, and every mile it obliges for is drawing that blend further into your fuel system. A van driving to a difficult location is no trouble for us, and it is a lot better for the vehicle than carrying on.
A few miles on petrol in a diesel: what now?
This is where your Great North Road matters, under 10 miles out of Wittering. A loss of power, a lumpy idle, smoke: those are the symptoms when they arrive, rather than a neat stop — and a misfuelled diesel will often take you onto it and some distance along before anything feels wrong at all.
Take the next junction that is safe, stop there, and do not restart the car to reposition. It alters what our engineers bring, so mention it when you phone: on a longer drive — anything near the under 10 miles to the closest city — take it the petrol has been through your filter, your pump and your injectors.
A little about Wittering
Wittering is a village in Cambridgeshire, situated inland at an elevation of around 66 metres, approximately 8.9 miles from Peterborough. Wittering lies near several smaller settlements, including Thornhaugh, Southorpe, and Pilsgate, and is characterized by its predominantly semi-detached housing stock. Wittering is home to a population of around 1758 residents, who are within commuting distance of Peterborough and around 77 miles from London.
The call-out in Wittering, step by step
- Our engineers check what got in, how much, and if the engine has run. The replies change the work, which is why our technicians ask before quoting.
- That tank gets emptied of everything.
- Fuel lines are rinsed through and the filter cleaned, leaving nothing in your system that caused any of this.
- New diesel goes in, and then the system gets primed.
- It is started with new diesel in it, and we make sure that it's running correctly.
From that point, you're ready to set off. Permanent damage is very unusual when it has been spotted quickly, and since all of it is done where the vehicle is, it never has to be taken to a workshop.
AdBlue in a diesel tank around Wittering is a separate job
Do not fire it up: that first step holds whether what got in was AdBlue or petrol. What differs is the issue itself. Petrol weakens the diesel and takes away the protection the system relies on. Corrosion and deposits are what a diesel tank gets instead, because AdBlue is urea dissolved in water.
Our engineers cover both, and AdBlue removal around Wittering has its own page with the details — including why it is usually the more serious of the two.
Wittering pricing for a petrol-in-diesel fuel drain
What shifts the price is set out below, because the job isn't one job and our technicians cannot honestly put a single figure on this page.
- Whether your motor has been started or driven. This is the key one.
- Wrong fuel in, against what the tank holds — that proportion.
- Whether it's petrol or AdBlue.
- Access: the car's position, and whether working on it there's safe for a technician.
Tell us your car, the amount and whether it has run, and you will get a straight answer rather than a range. If it isn't urgent — the car is at home and going nowhere — works too.
Petrol in diesel: frequent queries in Wittering
Fuel drains on a Wittering petrol station forecourt
Yes, and it's where a large part of this work takes place. Consent from the site is the condition. Given that, a forecourt like Morrisons is somewhere we are regularly, along with the rest of them locally — so name yours on the call and you'll hear whether working there is possible.
How much petrol in a diesel is too much?
Whether the motor has run matters much more, though the proportion matters too, instead of the litres. Five litres into a nearly dry tank is not five into a full one, no. But both land on the same question in the end: has that blend been sucked right through, or has it not?
Petrol in my diesel, and I have driven the vehicle
Somewhere safe, then stop, then turn off and leave it off. It is recoverable a lot more regularly than motorists expect, even though driving is what shifts the trouble from that tank into your pump and injectors — and the single most valuable thing you can do now is not restart it.
My warranty — does a fuel drain void it?
A manufacturer's warranty outlasts a drain then flush done to a correct standard, which is no modification at all. A disagreement over a warranty is likelier to come from running a diesel on petrol — so leave it switched off.
Two-stroke oil in the tank, and then home?
No. It belongs to a distinct issue from a different era, and petrol has weakened something no oil of that kind replaces. Your pump still has to cope with it, since that tank still has petrol in it later.
A main dealer for petrol in a diesel — essential?
No. We drain and flush the vehicle wherever it is, so there is no need to take it to a dealership.
You, and your car, still together?
Your engine remains off.
Turn it off somewhere sensible and keep it off, if you have already driven it. Cold, still, going nowhere: that's the best position to be in. People fear this much more than they need to.
Emptying misfuelled vehicles, Wittering and the rest of Cambridgeshire, wherever they are. Roadside. Forecourt. Home.