St Johns: Put Petrol in a Diesel Car?
If you have not turned on the engine as yet, don't. A fuel drain and nothing more is almost always what a motor requires while the petrol is still sitting in your tank and the engine has not yet turned over, which is why it is the following few minutes that count, not how much went in. Petrol in Diesel goes to the car wherever it has ended up in St Johns or the rest of Greater London, on the forecourt, at the roadside or on a driveway, and drains and flushes it there. Contact us before everything else starts, so you will know what comes from there.
Now what? Petrol in a diesel, step by step
- Do not start the vehicle — and never believe it when it fires up. This is the bit drivers get wrong about petrol in a diesel in particular. A petrol motor filled with diesel generally just can't run, so the person stops and the wear halts with them. A diesel fed petrol typically starts, idles and drives off without complaint for a couple of miles. It is not okay. It's grinding the fuel system as you drive.
- Leave the car's ignition be as well. Diesel has two jobs: it ignites, and before it burns it greases your high-pressure pump and those injectors. Petrol does the first and not the second. Switching the car's ignition on is frequently sufficient to prime the system, which pulls that petrol out of that tank then into exactly those parts.
- Never add diesel on top to weaken it. A diesel fuel system does not accept petrol by percentage as that guidance suggests, and topping up gets rid of nothing — it merely leaves you a fuller tank of the same mixture. The octane makes no difference either: super unleaded is still petrol.
- Stay still if it is safe to. Hazards on, engine off, keep the vehicle. Wherever you have stopped — the verge on Cranbrook Road, anywhere — an awkward location for us is better than a started motor, and nothing is simpler for us to deal with than a vehicle that never moved.
- The van showing up rather than circling hinges on two things: a postcode starting SE8 4, and whatever is next to you with a sign on it. Get both ready before you call.
- Three details settle the entire job: the liquid you tipped in, the rough volume of it, and if it has been going since. The number is 0333 366 0103.
Can petrol be pumped out of your diesel at the forecourt?
It kicks off at a forecourt, typically. Quite often it ends at one as well. If you are still on the forecourt at Esso, that's normally where the drain takes place — we operate on garage forecourts routinely, with the station's permission.
Before your engine has started — the forecourt is the single setting the mistake ends up halted. Our technicians can still put it right where it sits, even away from the pumps. In a car park, on a drive or in a lay-by, the vehicle has been started and moved there, and that drew fuel through the filter then into the high-pressure fuel pump, all the way from that tank. None of that is a catastrophe, although the flush then has to reach past the tank to the lines and the filter, and the few seconds between checking your receipt and reaching for your key are what decide that.
Away from the pump, the next motorist can get through — so yes, let the staff help you wheel the car. Very much worth doing. Starting the car just for four car lengths? Don't.
Diesel Skoda Octavia. A couple of litres of unleaded. Driven a couple of miles. Shut off now, at Co-op Food. That is the enquiry our engineers want, because the point under it is about quantity through the pump instead of hours on the clock.
You'll be urged to shift the car clear of the gateway and deal with it later. Please don't. On the zig-zags by St Stephen's CofE Primary School, a misfilled Audi A4 running on diesel is in the way, and that is all it is. Crank it three more times being courteous and you have turned a tank into a fuel system: every start primes the fuel lines, every prime pulls more petrol past the fuel filter on to your pump. Let them complain. Ring us.
It will start. It will pull away quite happily. That's the trouble, since a diesel on a thinned tank behaves generally while grinding the parts its fuel should be lubricating. So no, do not chance the journey home from The Brookmill Pub — leave the Ford Focus then phone.
The pump is not turning, and so whatever your diesel Mercedes C-Class did on the way to Broadway Fields, none of it is going on now. Nothing gets worse whilst it sits. Take your time over this — but do not drive the vehicle home to buy any.
That sluggishness is the fuel failing to build pressure correctly, not your engine packing up — and with no warning light for it, vehicles in that position generally get driven a second time before somebody phones. Do not. A few streets is all it got: throttle gone soft, idle turned lumpy, and a diesel Volkswagen Polo now resting close to Brockley Farmers' Market. Switch the vehicle off and phone us.
Do our technicians cover your part of St Johns?
As a residential suburb, St Johns gets a frequent call, and the areas nearby go with it on the same run: Deptford and Greenwich, New Cross and Blackheath, Ladywell.
We do come. Those names above are merely the closest neighbours, and a page is there for most places across Greater London, so an absence from the list is not an absence from our coverage. Presuming is the habit to avoid, particularly on the boundary or anywhere your satnav fails. Call us and ask.
Use this map for the ground covered here. Kerbside, forecourt, drive, car park: every bit of it is territory we work on, and none of it requires the car to travel to us.
Kerbside stops in St Johns
Not everyone has the opportunity to pull in somewhere safe. Hazards going in a lay-by somewhere, or stopped on the verge on Clandon Street as you worked it out after setting off — our technicians take that call so often that it is the usual kind.
Remain by the motor when it's wise to be inside, but clear of it if it isn't. Do not fire up the motor to limp the vehicle somewhere handier — a diesel running on petrol will often oblige, and every mile it obliges for is pulling that blend further into the fuel system. A technician coming to a difficult location is no problem for us, and it is a lot better for the vehicle than carrying on.
Already run it? Petrol in a diesel after a couple of miles
Your M11 is the road which matters now, and it runs under 10 miles from St Johns. A wrongly fuelled diesel will frequently get you onto it and some distance along before anything seems wrong, and the symptoms when they appear are normally lost power, a rough idle and some smoke rather than a tidy stop.
The first safe exit is the one to take. Turn off there, and leave the restarting alone. Assume the worst of that on a long run. Anything approaching the under 5 miles to the closest city, and the contamination has been through the fuel filter, through your pump, through the fuel injectors. Say so when you ring. What our engineers bring alters.
Where's St Johns?
St Johns is a suburban area in south-east London, situated on the banks of the River Thames. St Johns is characterized by its predominantly flat housing stock, with many residents enjoying views of the river. St Johns is located near several other notable areas, including Deptford, Greenwich, and New Cross, and is relatively close to central London, being only 4.2 miles away from the city centre.
When our engineers arrive with you around St Johns: what follows
- We check what got in, how much, and whether the engine has run. The replies alter the work, which is why our engineers ask before pricing.
- The contaminated mixture comes from your tank.
- What is remaining in the system should not be what created the issue, and so the lines get flushed and your filter cleared.
- Bleeding your system follows, once clean diesel is in.
- When it is fired up, our technicians make sure it runs properly on new diesel.
That has it ready to drive away. Long-term damage is very uncommon when it has been caught early, and because all of it is done where your car is, it never needs to go to a workshop.
AdBlue in a diesel tank in St Johns is a distinct matter
Never fire it up: that first instruction stands whether what got in was AdBlue or petrol. What changes is this fault itself. Thinned diesel, and no lubrication left for your fuel system that relies on it. That is petrol. AdBlue? Urea dissolved in water. Put that in with the diesel and you get corrosion instead, plus deposits.
Our engineers deal with both, and AdBlue removal in St Johns has its own page with the details — including why it is usually the more serious of the two.
St Johns costs for a petrol-in-diesel drain
Honestly, no single price belongs on a page like this. The job varies. Here's what varies it:
- Has it been run or driven? Nothing else matters for as much.
- How much of the wrong fuel was put in, weighed against how much that tank takes.
- Whether it is petrol or AdBlue.
- Where the car is, and if our van can safely get to and work on it.
Tell us your vehicle, the quantity and if it has run, and you will get a clear answer instead of a range. Not urgent, with the vehicle at home and going nowhere? Then is fine.
Questions our technicians hear about petrol in diesel around St Johns
Fuel drains on a St Johns petrol station forecourt
Yes — forecourts are where a large part of this takes place. Tell us which one you are at when you ring and we will tell you whether we can work there. With the station's permission we work at Tesco and the other forecourts nearby regularly.
A few litres of petrol in a diesel — too much?
It depends on the proportion rather than the litres, and far more on whether your motor has run. Five litres in an almost empty tank is a distinct matter from five in a full one — but either way, the thing that settles how much work is needed is whether that mix has been sucked through your fuel system.
Petrol in my diesel, and I have driven the car
Pull in somewhere sensible, switch off, then leave the vehicle off. Driving is what moves the issue from that tank into the pump and injectors — but it is recoverable far more frequently than motorists expect, and the single most helpful thing you can do now is not restart the car.
Fuel drains and manufacturer warranties
A drain then flush carried out correctly isn't a change and doesn't cancel a manufacturer's warranty. What's likelier to start an argument is a diesel that has been run on petrol. One more reason for the engine to remain off.
Adding two-stroke oil, then driving home
Two-stroke oil solves a different fault, and an old one at that. Nothing it does puts back what petrol diluted. No. Your tank still has petrol in it later on, and the pump still has to live with it.
A main dealer for petrol in a diesel — necessary?
You do not need one. Your car is drained and flushed wherever it is, with no need to take it to a main dealer.
Waiting next to it?
Turned off is the way the car remains.
Switch it off somewhere sensible and leave it off, if you have already driven it. A still, cold car is the best place to be in, and this is recoverable from far more frequently than people assume.
At the kerbside, on the forecourt or at home — call-out fuel draining around St Johns and across Greater London.