Readers Corner: Put Petrol in a Diesel Car?
If you have not fired up the motor as yet, don't. A fuel drain and nothing more is almost always what a vehicle needs while the fuel is still sitting in that tank and the motor has not been started, which is why it's the following few minutes that matter, not how much got in. Petrol in Diesel travels to the vehicle wherever it has stopped in Readers Corner or the rest of Essex, on the forecourt, by the roadside or on a private drive, and drains and flushes it there. Our engineers will explain what the following stage is. Phone — it comes ahead of everything else.
Petrol in a diesel: what to try next
- Do not crank it. Turned on anyway? Then don't depend on it. Diesel in a petrol motor typically can't run, and so the driver stops and the harm halts with them. Petrol in a diesel? It starts. It idles. It moves off fine, for a few miles. People get that reversed. It is not all right — the fuel system is grinding every mile you do.
- Flicking the ignition on frequently primes the system, and priming is what moves petrol out of your tank then into your pump and injectors. Those are the components diesel keeps oiled on its way through, before it ignites. Petrol does the burning and none of the oiling. Leave the car's ignition alone.
- Never weaken it. Diesel put on top takes out nothing, and so all you have is more of what was already there, because percentage is not how a diesel fuel system tolerates petrol. Super unleaded? Simply petrol. The type makes no difference.
- A vehicle that has never shifted is the simplest one to sort, so remain where you are if you safely can. Parked on the verge on Pitt Chase? Hazards on, and leave the car there. A difficult location suits us better than a started motor.
- A van showing up rather than circling depends on two things: a postcode that starts CM2 8, and whatever is next to you with a name on it. Have both ready before you call.
- Call 0333 366 0103. Say what got in, approximately how many litres, plus if your car has run. These three details determine the whole call-out.
Can petrol be pumped from a diesel at a forecourt?
Most of the work begins at a pump, so a big share of that gets finished at one. Still at Texaco? Then that's usually where it gets done. Station forecourts are routine for us, with the permission of the owner.
A forecourt is the one setting this is spotted before the motor has run. We can still deal with it where it stands, even away from the pumps. In a car park, on a driveway or in a lay-by, your car has been fired up and driven there, and that pulled fuel through the filter then into the high-pressure pump, right from the tank. None of that is a disaster, though the flush then has to go past the tank to the lines and the fuel filter, and the few seconds between seeing the receipt and going for your key are what settle that.
Roll the car out of the way if the staff volunteer, and they usually will. The next customer gets by the pump, and that's worth doing. Four car lengths isn't worth a start.
The complicated part is the bay, not your fuel. Motors either side of you, a trolley shelter behind, and from time to time a height barrier on the way in that decides if our van can get to you at all — so when you call from a car park like the one at Co-op Food, tell us how much space there is around you and which way round the vehicle is. Those we cover regularly. Should there be no space to work alongside the diesel BMW 3 Series, it gets rolled with the engine off, and not out of fuss over a handful of seconds of running: priming occurs at every start, more of the blend departs your tank for your pump, and two shunts into a nicer spot have gradually made a worse job of what was just a motor sitting still.
A diesel pump meters fuel to demand, and a rushed morning run demands plenty — so three miles in your Audi A4 sounds like nothing and isn't. Twenty to nine outside Larkrise Primary School, already late, the receipt in your hand showing unleaded: hazards on, engine off, phone.
A diesel injection system works hydraulically as well as chemically: the fuel has to hold pressure, not merely burn. Thin that fuel and pressure which should build and stay built escapes past gaps instead, leaving the motor a weaker, later, less even delivery than it was designed around. Petrol thins diesel, and diesel has to be viscous enough to seal the precision parts it passes through — that is the full process. It explains the normal The Donkey Fields call too: a diesel Mercedes C-Class that travelled out without complaint and came back down on power, rough at idle, possibly smoking a little. None of which is the engine failing, and that's the bit worth hearing. The fuel has stopped acting like diesel. Put your fuel right and it stops.
About as well as this goes, once the motor has turned: away from the pumps, receipt read, and your diesel Peugeot 3008 left near Baddow Village sign hardly two streets on. Call us, and leave it off. A short distance does genuinely help. It was still a start and still a drive, though, and so the filter and your pump have had weakened fuel through them — hence flushing the fuel lines rather than only clearing your tank.
A throttle gone dead, white smoke, an uneven idle, clattering: that's a misfilled diesel Volvo XC60 telling you what is wrong. Do not restart the vehicle to find a better place — turn off where you have stopped, by St Mary the Virgin, Great Baddow or anywhere else.
Do we cover your part of Readers Corner?
Those same rounds carry us to Great Baddow, Galleyend, Sandon, Baddow Park and Galleywood besides Readers Corner, which is a neighbourhood.
Not on the list? That means nothing. The names above are just the closest few, and nearly all towns in Essex have a page of their own elsewhere on the site. Phone to ask rather than presuming, especially if you are on a border or somewhere a satnav struggles with.
See the map for the patch shown on this page. Our technicians work by the road, on forecourts, on driveways and in car parks across all of it, and the vehicle doesn't need to move to us.
Stranded by the kerbside near Readers Corner
Not everybody gets a chance to stop anywhere safe. Hazards flashing at a lay-by somewhere, or pulled onto the verge on Galleywood Road since you noticed after setting off — our technicians take that call so often that it's the usual kind.
Whether you remain with your car or move clear of it rests on whether staying nearby looks wise. Every mile a diesel obliges you for on petrol pulls the mixture further into the system — and oblige it often will, which is why the engine doesn't get restarted to limp somewhere handier. Our van heading to a tricky place is no trouble for us, and it is far better for your car than pressing on.
Petrol in a diesel, but the vehicle has moved
This is where the M25 counts, under 15 miles away from Readers Corner. It will usually get you onto it, and some way along, before you notice a thing. Then it's smoke, an uneven idle and power draining away — not a clean stop. Wrongly fuelled diesels rarely give you one of those.
Get off at the first sensible exit, switch off, and never start it to move it. It changes what our technicians bring, and so tell us when you ring: on a longer drive — anything close to the under 3 miles to the closest city — take it the contamination has been through the fuel filter, the pump and your injectors.
Readers Corner itself
Readers Corner is a locality in Essex, situated approximately 1.9 miles from Chelmsford and 30.3 miles from London. Readers Corner lies in a relatively low-lying area, with an elevation of around 46 metres, and is surrounded by nearby places such as Great Baddow, Galleyend, and Sandon. Readers Corner has a population of approximately 3147 people, predominantly living in semi-detached housing.
The job in Readers Corner, step by step
- The responses shape the work, which is why our technicians ask before quoting: what went in, how much of it, and whether the motor has run.
- The contaminated fuel comes from that tank.
- What is left in the system should not be what created the trouble, so the lines get rinsed and the fuel filter cleared.
- Priming follows, once clean diesel is in.
- After it is fired up, our technicians make sure it runs correctly on new diesel.
From that point, you are ready to set off. Everything is done where the car is, so it never has to be taken to a garage, and when it has been noticed soon, permanent damage is very unusual.
A different matter: AdBlue in a diesel tank around Readers Corner
AdBlue rather than petrol? Then the first instruction is unchanged — the motor remains off — while this issue beneath it is a different one altogether. Weakened diesel, and no protection left for the system that relies on it. That is petrol. Corrosion and residue are what a diesel tank gets instead, since AdBlue is urea dissolved in water.
Both are ours. There is a separate Readers Corner page for AdBlue removal, with the full story on it — including the reasons it usually turns out to be the worse of the two.
Budgeting for a petrol-in-diesel drain around Readers Corner
Honestly, no single number fits on a page like this. This job changes. Here is what varies it:
- Has it been run or driven? Nothing else counts for as much.
- How much of the wrong fuel got in, set against how much the tank can hold.
- AdBlue or petrol, whichever went in.
- Whether our van can safely reach your car and work on it, which hinges on where the vehicle is.
The vehicle, the amount, whether it has run — give us those and the answer comes back straight rather than as a range. Motor at home, going nowhere, nothing time-critical about it — is good for that.
Readers Corner drivers ask us these about petrol in diesel
Can you do a fuel drain at a petrol station in Readers Corner?
A fair part of this work takes place there, so yes. Our engineers work at BP and the other forecourts around town routinely, with the station's agreement — tell us which one you are at when you call and we'll tell you if we can work there.
A few litres of petrol in a diesel — too much?
Whether the engine has run counts much more, though the ratio counts too, instead of the litres. Five litres in an almost empty tank is a separate case from five in a full one — but either way, the thing that settles how much work is needed is whether that mix has been pulled through your fuel system.
Already driven it with petrol in the diesel? Now what?
Stop somewhere safe, switch off, and leave the vehicle off. Driving is what takes the issue from that tank into your pump and injectors — but it's salvageable much more often than drivers expect, and the single most helpful thing you can do now is not restart it.
Is a fuel drain going to void my warranty?
A manufacturer's warranty survives a drain then flush done to a proper standard, which is no change at all. Running a diesel on petrol is the thing likelier to cause an argument with one, which is another good reason to leave the car turned off.
Could I put some two-stroke in and just drive?
No. It belongs to a distinct issue from a bygone era, and petrol has diluted something no oil of that kind puts back. Afterwards? Still petrol in that tank, and a pump that has to cope with the stuff.
Does petrol in a diesel have to go to a main dealer?
There is no need to take it to a franchised dealer, since our technicians drain and clean the vehicle wherever it is.
You, and the car, still together?
Don't turn the car back on.
Already driven it? Then pull in somewhere sensible, switch off, and let the car remain that way. Cold, stationary, going nowhere: that's the best place to be in. People fear this far more than they need to.
Call-out fuel draining around Readers Corner and across Essex — at the roadside, on the forecourt or at home.