Put Petrol in a Diesel Car in Prestonfield? Don't Start It
Petrol in Diesel drains and flushes wrongly fuelled vehicles where they stand, on the forecourt, by the roadside or on a drive, across Prestonfield and the rest of City of Edinburgh. The very first thing to do is not to start the motor. When your engine has not turned over and the petrol is still sitting in your tank, a drain is nearly always all it needs, and the next few minutes settle that, not how much got in. Call us before anything else starts, so you will hear what happens next.
What to do next about petrol in a diesel
- Don't start it. Started anyway? Then don't depend on it. Diesel in a petrol car generally will not run, and so the driver stops and the harm ends with them. Petrol in a diesel? It starts. It ticks over. It pulls away happily, for several miles. People get that confused. It isn't all right — your fuel system is wearing down every mile you cover.
- Diesel burns, and before it ignites it protects — your high-pressure pump, its injectors. Petrol handles only the burning. So leave the car's ignition off also: switching it on is commonly enough to prime that system, and priming draws petrol from the tank into just those components.
- Do not add diesel on top to weaken it. A diesel fuel system won't tolerate petrol by percentage in the way that guidance presumes, and topping up gets rid of nothing — it just gives you a bigger tank of the same mixture. The grade makes no difference either: super unleaded is just petrol.
- Wait where you are if you safely can. A motor that has not shifted is the simplest one to handle, and we would sooner get to a tricky location than have it started. If you are parked on the verge on Clearburn Road, put your hazards on and keep the car there.
- Have your whereabouts ready before you call. A postcode that starts EH16 5 and whatever is nearest to you with a sign on it is the difference between our van arriving and our van circling.
- What was put in, approximately how much, and whether the engine has fired — those three facts settle your whole job. Phone 0333 366 0103 then tell us.
Quarter past eight, a rushed fill-up on the trip in, and the penny drops at about eleven — by that point the diesel Volkswagen Passat has been standing at Edinburgh Waverley for three hours. Call us then leave it exactly where it stands. The drive in is the part that is key now, because diesel has two roles on its way through the engine: it burns, and before it ignites it greases the injection pump and its injectors. Petrol does the first and not the second. So those couple of miles were driven with your pump running on a fuel that had shed most of the protection it is built around — which is why the thing our engineers ask is how far you drove, not how long the vehicle has been sitting.
Diesel Renault Clio. A few litres of unleaded. Driven a couple of miles. Shut off now, at Sainsbury's. That's the call we want, since the real question under it's about amount through your pump instead of hours on the clock.
Three replies settle most of the work: what was put in, about how much, and whether your engine has run since. We ask for them as soon as we arrive at the vehicle in the car park by Grey Horse. Next the polluted blend comes out of your tank, the fuel lines are rinsed, and where your BMW 3 Series has a serviceable filter, it comes off. When clean diesel is in and the system primed, our engineers start the car and make sure it runs smoothly before you drive away.
Injection pressure is the part being lost. Petrol weakens diesel, and runnier fuel seeps past the tightly fitted components that are meant to build that pressure, so the further a diesel Vauxhall Astra travelled, the less well it held. Fine on the way out and gutless on the way back is how the drive to Prestonfield Park went, then, and your tank is the place to look. Stop somewhere safe, switch off and ring us.
Three things help when you ring from close to Prestonfield Neighbourhood Centre: which side the filler is on, whether a technician can stand beside without blocking the road, and whether your engine has run since you filled up. On-street is the most common location we work, so the place itself is hardly ever the problem — we'd much rather deal with a cramped parking spot than with a vehicle that has been driven to somewhere more convenient. We will drain the Audi A6, change your filter where there is a workable one, flush the lines then put fresh fuel through the whole circuit, as by this point the worst of that is resting in the fuel lines instead of in the tank.
Pump-side draining for petrol in a diesel
Forecourts are where this job mostly begins, and where a good chunk of it ends. We operate on petrol station forecourts all the time, with the station's permission, and so if you're still at Sainsbury's that's typically where this drain takes place.
A filling station is the single spot the mistake gets stopped before the motor has run. Fuel pulled out of the tank and through the fuel filter, right to the high-pressure pump, is what happens when your engine is switched on and the vehicle is driven to where it is now: the car park, the private drive or the lay-by, anywhere other than the forecourt. So the flush takes in your filter and the lines together with your tank. That is still not a disaster, and we put it right where the car is. What settles it is whether the ignition was reached for in the seconds after your receipt was read.
Move the car out of the way if the staff offer, and they generally will. The next motorist gets by the petrol pump, and that's worth doing. Four car lengths isn't worth a restart.
Parts we cover around Prestonfield
Prestonfield is a residential suburb, and so our technicians head out to it and to the places around it on those same rounds: Nether Liberton, Craigmillar, Newington, St Leonards and The Inch.
There are pages for most places around City of Edinburgh, and the ones mentioned above are just the closest neighbours — so yours being absent from that list means nothing at all about if we come. Call us to check rather than assuming — borders above all, and wherever a satnav can misread.
The map shows the area this page covers. All of that is territory we serve: a kerbside, a forecourt, a driveway, a car park. You do not drive the vehicle anywhere.
Broken down at the roadside in Prestonfield
Not everybody has a chance to pull over somewhere suitable. A routine call for us and not an unusual one: worked out after setting off, finished up along the verge beside Priestfield Road or at a lay-by with the hazards on.
Clear of your car when it isn't sensible to wait in it, with it if it is. Every mile a diesel obliges you for on petrol draws that blend further into the fuel system — and oblige it usually will, which is why the engine does not get restarted to limp somewhere safer. We'll send the van to a tricky spot without any trouble, and for the car that is much better than driving on.
Petrol in a diesel, but the motor has moved
under 10 miles out of Prestonfield, your M8 is what matters now. A wrongly fuelled diesel will usually get you onto it and some distance along before anything seems wrong, and the symptoms when they come are normally a loss of power, an uneven idle and some smoke instead of a tidy stop.
The first sensible junction is the one to take. Turn off there, and leave the restarting alone. Suppose the worst of it on a long drive. Anything approaching the under 3 miles to the closest city, and the mixture has been through your filter, through the pump, through the fuel injectors. Say so when you phone. What we bring changes.
Where's Prestonfield?
Prestonfield is a suburban area located on the southern edge of Edinburgh, Scotland's capital city, and is situated near the coast. Prestonfield sits at an elevation of 44 metres, with its predominantly flat-type housing stock reflecting the area's relatively low-lying geography. Prestonfield is close to several nearby places, including Nether Liberton, Craigmillar, and Newington, and is approximately 1.9 miles from Edinburgh's city centre.
Once we arrive with you in Prestonfield: what follows
- We check what went in, how much, and whether your engine has run. The replies shape the work, which is why we ask before quoting.
- That tank is emptied completely.
- What is left in your system shouldn't be what caused the issue, so your fuel lines get rinsed and the fuel filter cleaned.
- The system gets primed, on new diesel.
- It is started with new diesel in it, and our engineers make sure that it's running correctly.
At that point it's ready to set off. All of this is done where your car is, so it never needs to be taken to a garage, and when it has been noticed quickly, long-term damage is very rare.
AdBlue in your diesel tank instead, in Prestonfield?
If what got in was AdBlue rather than petrol, the first rule is the same — never crank it — yet the issue isn't. The lubrication a fuel system relies on is stripped away by petrol, which weakens the diesel. AdBlue is urea dissolved in water, and in a diesel tank it brings corrosion and build-up in its place.
AdBlue removal around Prestonfield has a page of its own with the detail on it, including why it is often the more serious of the two. Our technicians handle both.
Paying for a petrol-in-diesel fuel drain in Prestonfield
One price would not be honest here, as this is not one job. These are the things that change it:
- Has it been started or driven? Nothing else counts for as much.
- Wrong fuel in, against what that tank holds — that ratio.
- Which got in: petrol or AdBlue.
- Whether a technician can sensibly get to your vehicle and work on it, which depends on where the car is.
A clear answer instead of a range is what you get for telling us three things: your car, the quantity, and if it has run. If it is not pressing — your car is at home and going nowhere — works too.
Petrol in diesel questions from Prestonfield motorists
I'm on a forecourt in Prestonfield. Can you drain the car on the spot?
Yes, and it's where a fair share of this work gets done. Regularly, provided the site consents: BP, plus every other forecourt nearby. Say on the phone where precisely you have stopped. Whether our engineers can work in that location is something our engineers answer there and then.
How much petrol is too much for a diesel?
Litres are not the measure. Ratio is, and a lot more than either, it matters whether anything has been run. Five litres into a nearly dry tank isn't five into a full one, no. But both land on the same question in the end: has that mixture been pulled right through, or has it not?
I put petrol in my diesel and drove the car. What now?
Stop safely. Off. Nothing after that. Not restarting it is the single most helpful thing available to you now. Driving does move the issue out of your tank and into the pump and injectors, yes, and it remains fixable far more frequently than motorists assume.
Will a fuel drain void my warranty?
A manufacturer's warranty survives a drain then flush done to a good standard, which is no change at all. An argument over a warranty is likelier to come from running a diesel on petrol — so leave it switched off.
Two-stroke oil in your tank, and then home?
What petrol has weakened is not put back by two-stroke oil, which is an old remedy for a distinct problem. So no. Petrol stays in that tank later on, whatever else goes in, and your pump gets no break from it.
Do I need a main dealer for petrol in a diesel?
Not at all. Our technicians drain and flush the car wherever it is, so there's no need to bring it to a dealership.
Still with the vehicle?
Keep the engine switched off.
Already driven it? Then pull in somewhere safe, turn off, then let the vehicle stay that way. This is recoverable from much more often than motorists fear, and a stationary, cold vehicle is the best place to be in.
Across City of Edinburgh and in Prestonfield: on-site fuel draining, at home or on the forecourt or at the roadside.