Upperton: Petrol in a Diesel Car? How Worried to Be
Unstarted? Then less anxious than you likely are. Everyone in Upperton begins with "have I ruined it?", and the honest answer is usually no: petrol left in the tank of any diesel remains harmless until priming, cranking or driving pulls it into the system. Leave your engine off then call Petrol in Diesel — that keeps it like that. Further down, this page sets out what petrol actually does inside a diesel, how far it may have gone, and how to stop it happening to you a second time.
Petrol in a diesel: what does it do to the motor?
Passing through an engine, diesel is doing two jobs at once. It combusts, and before it combusts it protects. Your high-pressure pump and the injectors are designed to very fine tolerances, and the diesel passing through them is what keeps those surfaces from wearing against each other.
The second job petrol doesn't do at all, and the first it does badly. The rattling comes from petrol being designed not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips out the lubrication the system rests on, and any pump running on such a mixture is wearing itself.
Put these together and the shape of the issue is clear. The damage is done by movement, not by contact. All a tank with petrol in it amounts to is a fuel problem. The start of a mechanical one is a pump that has been running on that petrol — and whatever a worn pump sheds moves on with your fuel to the injectors beyond it.
Four scenarios we see in Upperton: how bad is petrol in a diesel?
Filled up, not once started. The best case there is. At a forecourt, and really only there, the petrol is still limited to the tank — because everywhere else the car was driven to get to it. The job is emptying and cleaning on the spot.
Your ignition switched on, or a short start. Your system has been bled, and so petrol has left the tank and got to your filter and the lines. That is usually still a straightforward task — a drain, a flush, and your filter seen to.
Your pump has worked a couple of miles on weakened fuel — that's what driving the vehicle meant. How hard your car was driven matters as much as how far, and the work takes in your tank, the lines, the filter and fresh fuel through the entire circuit. Driving the children to Motcombe Infants' School is one sort of trip. Very different again: a run to Brighton and Hove, under 25 miles away, or some mileage on the M23, under 50 miles from Upperton, where your engine kept working hard.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone ragged. That's the engine telling you its fuel no longer is behaving like diesel. Whether it is the verge on Moatcroft Road, a lay-by or a side street, stop there and leave it. The fuel drain and flush-through still go first, and they take care of it: if a vehicle is stopped quickly, long-term damage is very rare.
Upperton drivers and that petrol in a diesel myths they hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Topping up removes nothing; it gives you a fuller tank of the same mixture. A diesel fuel system does not tolerate petrol by percentage in the way that guidance presumes.
Not so: a current diesel copes with a bit of petrol. If anything, the reverse. Finer parts and higher pressure are how a current diesel runs its fuel, and that makes the lubrication matter more, not less.
"It starts, it drives, so there is no harm" — the myth that trips up more drivers than any other. Feed diesel to a petrol motor and it normally will not run, and so the driver stops — and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile your pump grinds. Running is not the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a distinct problem. What petrol has weakened remains thinned, and that petrol remains in your tank anyway.
The next start sends petrol back round your pump from your lines and the fuel filter, where some of it ends up once the engine has run. That's why a DIY tank drain does not sort it — a myth. It is also truly risky to drain petrol into a can at the roadside.
How does petrol in a diesel occur?
Carelessness is seldom the cause, and no one means to do it. The forecourt makes it easy: the petrol nozzle is the narrower of the two, and it slides into a diesel filler with almost no resistance, while a diesel nozzle generally won't go into a petrol car at all. So the error runs one way.
The moment routine stops matching the vehicle is the moment it takes place. A vehicle that is new to you — hired, on loan as a courtesy car, or just bought. One petrol and one diesel on the driveway of the same household. Your usual forecourt, its pumps suddenly in a different order. A hurried fill en route to Eastbourne with a train to catch. The first fill-up in a diesel Renault Megane after years of driving petrol is precisely the moment it takes place. Your hand repeats what it has always done once you add rain, a phone call or a back seat full of children.
Next time you fill up around Upperton: preventing petrol in a diesel
- Read the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on every forecourt. The label is what counts.
- The first fill in a strange vehicle is the time to check the filler flap — inside it, or on the cap, many vehicles state the fuel to use.
- A coloured fob or a sticker on the diesel's key achieves more than any amount of intending to remember, in a home with one of each.
- It seems silly and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump.
- Thinking about something else is when this becomes an easy mistake to make, so tuck the phone away and keep your mind on the petrol pump.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to refuse a petrol nozzle, and add-on devices exist for cars without one. They are a safety net, not a reason to stop reading the petrol pump.
- Less petrol makes a thinner blend, so stop as soon as you realise — while remembering that the next step is unchanged. It is still not to fire it up.
Petrol already in a diesel in Upperton? Begin here
Then, there's only a short order of things. Never crank it, and do not turn your ignition on. If you're still on the forecourt — Power- Old Town Service Station or anywhere else — ask the attendants to help you push it away from the petrol pump. Then ring 0333 366 0103 and tell us what went in, roughly how much, and if it's run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a different fault — Upperton has a page just for it.
What makes one Upperton petrol in a diesel task cost more than the next
There's no fair single price for this, since the four situations above are four different jobs. Chiefly, the cost shifts with which situation you are in. Where your car is matters too, and whether our van can safely reach it, after the share of petrol to what that tank takes.
Before any quote, not after, come three questions: the fuel that was put in, its quantity, and if it has run. That is why. A range turns into a straight figure when the replies are in.
About Upperton
Upperton is a coastal suburban area in East Sussex, situated near the towns of Eastbourne and Brighton and Hove. Upperton lies at an elevation of 24 metres, close to the sea and within a short distance of nearby places such as Downside and Meads. Upperton has a population of approximately 9009 people, predominantly residing in flat-type housing. Upperton is also relatively close to London, being around 53.5 miles away from the capital city.
Upperton and East Sussex: where our fuel drain cover runs
Upperton sits in the BN postcode area, and the teams that answer petrol in diesel call-outs there work the locations near it as well — Eastbourne, Downside and Meads among them. Our engineers drain wherever the car is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
Still at the petrol pump around Upperton?
Then you are in the best spot there can be. Keep it off. Call.