Petrol in a Diesel Car in Porthmadog
If you have not turned on the engine as yet, do not. A drain and nothing else is nearly always what a car requires while the petrol is still in your tank and the motor has not been started, which is why it's the following few minutes that count, not how much got in. Petrol in Diesel comes to the car wherever it has ended up in Porthmadog or the remainder of Gwynedd, on the forecourt, by the roadside or on a driveway, and drains and flushes it there. Our technicians shall explain what the next step will be. Ring us — that comes before everything else.
What to do now about petrol in a diesel
- Never crank it — and never trust it when it does start. Here is the part most people have wrong about petrol in a diesel specifically. A petrol motor given diesel typically just will not run, so the person stops and the harm ends with them. A diesel given petrol generally starts, idles and pulls away perfectly well for a few miles. It isn't all right. It's eating into your fuel system while you drive.
- Flicking the car's ignition on commonly primes the system, and priming is what moves petrol out of the tank and into the pump and injectors. Those are the parts diesel keeps oiled on its way through, before it combusts. Petrol handles the burning and none of the oiling. Leave the ignition alone.
- That guidance assumes a diesel fuel system copes with petrol by percentage. It won't. Pour diesel on top and nothing at all is taken out; what you get is a fuller tank of the same mix. And no, the octane makes no difference — super unleaded is just petrol.
- A motor that has never moved is the quickest one to handle, and so wait where you are if you reasonably can. Parked on the verge on High Street? Hazards on, and leave the car there. An odd spot works for us better than a started diesel.
- The van showing up instead of circling rests on two things: a postcode that starts LL49 9, and whatever is closest to you with a sign on it. Get both prepared before you call.
- Ring 0333 366 0103. Say what got in, about how much, and also whether the engine has run. Those three replies determine your whole call-out.
Nothing about the hours since has lost you anything. Fuel sitting in a tank is idle, and so a diesel Volkswagen Golf sitting at the nearest station this morning is no worse at five than it was at nine — what pushed weakened diesel through the pump was the journey in. Call us before you go to fetch the vehicle.
Put diesel in a petrol motor and generally it will not run, so the driver stops there and the wear stops with them. Flip it — petrol into a diesel — and the car fires up, ticks over and pulls away as though nothing had happened, whilst the high-pressure fuel pump works without the protection the fuel is meant to be giving. That's the snag, and it is why your diesel Peugeot 308 will have seemed perfectly ordinary coming back from the local primary school. They always do. From the driver's seat there's nothing to warn you about, so nothing tells you. Call us with roughly how far you travelled, and how hard; the second answer matters more than the first.
What our technicians will want to know is whether the drive there was short and cold, since that's where petrol is least able to burn properly — and anything that won't burn can work past the rings then into the oil. Right up to the moment somebody drives it home, a diesel Ford Focus parked in the car park by The Australia carrying a tank of petrol in it is a straightforward job. Nothing worsens while it sits, so leave the car overnight and ring us in the morning.
None of it is the motor failing. That's the bit worth hearing, and it's why the ordinary Parc Porthmadoc call ends better than it sounds: a diesel Mercedes C-Class drives out there without complaint, comes back with the power gone, your idle lumpy and possibly a little smoke, and the cause is the fuel no longer acting like diesel. Diesel has to be heavy enough to seal the precision components it passes through; petrol thins it; and a diesel injection system is hydraulic as much as chemical, needing your fuel to hold pressure and not only to burn. So pressure that should build then stay built escapes past clearances, delivery shows up weaker and later and less even than built, and all of that stops once your fuel is sorted.
Turn off where you have stopped, and never start it to find somewhere better — near Capel Salem or anywhere at all. Clattering, an uneven idle, white smoke and a limp throttle are a misfuelled diesel Vauxhall Astra telling you what is wrong.
Can petrol be drained from a diesel at the forecourt?
The job kicks off at the pump, usually. Often enough the job finishes at one too. Still at Shell? Then that is typically where it gets done. Petrol station forecourts are everyday for us, with the permission of the owner.
A forecourt is the one spot it is caught before your engine has fired. Fuel sucked out of the tank and through the filter, right to your high-pressure pump, is what occurs when your engine is fired up and the vehicle is moved to where it is now: the car park, the driveway or the lay-by, everywhere other than the forecourt. So the flush takes in your filter and the lines together with that tank. That is still not a disaster, and we put it right where your car sits. What determines it is whether the key was turned in the seconds after your receipt was checked.
Push the vehicle out of the way if the attendants offer, and they normally will. The next driver gets past the pump, and that's worth doing. Cranking it for four car lengths? Don't.
Parts our vans reach near Porthmadog
As a coastal town, Porthmadog has a regular call, while the villages close by go with it on that same trip: Garth and Borth-y-Gest, Tremadog and Morfa Bychan, Minffordd.
Not on this list? That means nothing. The names above are simply the closest few, and the majority of locations in Gwynedd have a page of their own elsewhere on this site. Guessing is the habit to avoid, especially on the boundary or somewhere your phone goes wrong. Phone to check.
The area this page covers sits on our map. The lot is territory our engineers cover: a roadside, a forecourt, a driveway, a car park. You never move your car anywhere.
Stuck on the roadside near Porthmadog
Some people have no safe place to pull in at all. If you realised after setting off and finished up by the verge of Bank Place, or at a lay-by somewhere with your hazards on, that is a routine call for us instead of an odd one.
Whether you remain beside the vehicle or stand clear of it depends on if sitting there seems sensible. It will often oblige. A diesel running on petrol limps along quite willingly, and that is the problem: restart the vehicle to get to somewhere handier and that mixture goes further into the fuel system with every mile travelled. We will send the van to an inconvenient location without any bother, and for the car that's a lot better than carrying on.
Some miles on petrol in a diesel: what next?
This is where your Moreton Spur matters, over 50 miles away from Porthmadog. A wrongly fuelled diesel will often take you onto it and some distance along before anything seems wrong, and the signs when they appear are normally a loss of power, a lumpy idle and smoke rather than a neat stop.
Do not start it to move it. Pull off at the next sensible exit then turn off. On a longer run — anything close to the under 25 miles to the closest city — assume the mixture has been through the filter, the pump and the fuel injectors, and mention it when you call. It affects what our engineers bring.
All about Porthmadog
Porthmadog is a coastal town in northwest Wales, situated near the mouth of the Glaslyn River and the Snowdonia National Park. Porthmadog has a mix of terraced housing and other buildings, reflecting its history as a major slate exporting port. Porthmadog is close to several nearby villages, including Garth, Borth-y-Gest, and Tremadog, and is about 20 miles from the city of Bangor. Porthmadog sits at a low elevation of around 9 metres above sea level, looking out over Cardigan Bay.
Once our engineers get to you around Porthmadog: what happens
- Three things get checked before any quote — your fuel that went in, the amount, and if anything has been run since. Each answer alters the work.
- The polluted mixture is drawn from your tank.
- What is remaining in the system should not be what created the problem, and so the fuel lines get rinsed and the fuel filter cleaned.
- Our engineers put new diesel in and bleed the fuel system.
- It's fired up with clean diesel in it, and we check that it's running properly.
The car is then ready for you to pull away. There is no need for a workshop at any stage, since the work is all done where the vehicle is, and when it is caught quickly, permanent damage is very rare.
Porthmadog AdBlue removal is a separate job
If what was put in was AdBlue instead of petrol, the first instruction is the same — don't fire it up — but this fault isn't. The lubrication a fuel system depends on gets stripped away by petrol, which dilutes your diesel. AdBlue is urea in water, and in a diesel tank it brings corrosion and deposits instead.
Both are ours. There is a separate Porthmadog page for AdBlue removal, with the details on it — including the reasons it frequently turns out to be the worse of the two.
What a petrol-in-diesel drain will cost around Porthmadog
We can't put one figure on this page frankly, as this job isn't one job. What shifts it:
- Started? Driven? Either answer counts more than anything else on this list.
- How much of the wrong fuel went in, measured against how much that tank takes.
- The kind of fluid in the tank, petrol or AdBlue.
- Whether our van can safely reach your car and work on it, which rests on where your vehicle is.
Tell us what your car is, how much went in, and if your motor has run. A clear answer comes back, not a range. Not time-critical, with your car at home and going nowhere? Then is fine.
Petrol in diesel: frequent queries in Porthmadog
Fuel drains on a Porthmadog petrol station forecourt
A big share of this work happens there, so yes. Tell us which one you're at when you ring and we will tell you if our technicians can work there. With the site's agreement we attend Tesco and the other forecourts locally regularly.
A few litres of petrol in a diesel — too much?
It rests on the ratio rather than the litres, and a lot more on whether your engine has run. Five litres into an almost dry tank isn't five into a full one, no. But both land on the same question in the end: has that mixture been drawn right through, or has it not?
Petrol in my diesel, and I have driven the car
Pull in somewhere safe, switch off, then keep the vehicle off. Not restarting it is the single most helpful thing available to you now. Driving does move the issue out of that tank and into your pump and injectors, yes, and it stays fixable far more regularly than motorists assume.
Fuel drains and manufacturer warranties
A manufacturer's warranty survives a drain then flush done to a proper standard, which is no alteration at all. An argument 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?
Two-stroke oil solves a distinct problem, and an old one at that. Nothing it does puts back what petrol thinned. No. Petrol stays in that tank later on, whatever else goes in, and the pump gets no break from it.
A main dealer for petrol in a diesel — needed?
Wherever the vehicle is, our engineers drain and clean it there, so a drive to the main dealer does not come into it.
You, and your car, still together?
Do not switch the engine back on.
Turn it off somewhere sensible then keep it off, if you have already driven it. A stationary, cold vehicle is the best position to be in, and this is recoverable from far more frequently than drivers assume.
Clearing misfuelled motors, Porthmadog and the rest of Gwynedd, wherever they are. Kerbside. Forecourt. Home.