Hill Top: Petrol in a Diesel Car? How Worried to Be
Less than you probably are, provided it has not been started. "Have I ruined it?" is the first thing everyone in Hill Top asks, and the honest answer is usually no, since petrol resting in a diesel tank hurts nothing till it's dragged through the system — by ignition priming, by your starter, or by being driven. To keep the vehicle that way, phone Petrol in Diesel then leave your motor switched off. The rest of this page covers what petrol really does to a diesel, how to judge how far it has got, and how to make sure it does not happen to you a second time.
Petrol in a diesel: what does it do to the motor?
Passing through an engine, diesel does two things at once. It combusts, and before it burns it protects. The high-pressure pump and your injectors are built to extremely fine gaps, and your diesel passing through them is what stops those surfaces from grinding against one another.
Of these two tasks, petrol handles the first poorly and the second never. The knocking comes from petrol being made not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips away the protection the system hinges on, and any pump working on such a mix is wearing itself.
Put those together and the shape of the issue is plain. Contact does not do the damage — circulation does. Petrol in a tank is a fuel fault. After the pump has been running on that petrol, a mechanical problem has started: whatever is shed by a pump that is wearing down travels onward to your injectors with the fuel.
Petrol in a diesel in Hill Top: how serious is it? Four cases
Filled but never started — as good as it gets. That petrol is inside your tank and just that tank, and the task is a drain and a flush where the vehicle sits. This is the one scenario that can only really take place on a forecourt, as anywhere else your car has been driven to get there.
Started for a second, or only the ignition on. With the system primed, your lines and filter now contain petrol that has come from your tank. That's generally still an easy job — a drain, a flush, and the filter seen to.
A few miles driven, and your pump has spent each of them working on thinned fuel. Mileage is only half of it; how hard it was driven matters equally. Either way this work includes that tank, your lines, your filter and fresh fuel through the whole circuit. On the school run to Ley Top Primary School, the distance is short. Getting as far as Bradford, under 5 miles away, makes a very different job — as does any mileage on the M606, under 5 miles from Hill Top, with your engine running hard all the way.
Driven till it protested. Rattling, a ragged idle, smoke, a throttle that has gone soft. That's your motor telling you its fuel has stopped acting like diesel. Leave it wherever it stops: a lay-by, a quiet street, the verge on Cote Lane. What goes first is still the fuel drain and flush, and that deals with it, with permanent damage very uncommon when a car is stopped soon.
Hill Top drivers and the petrol in a diesel stories they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing is removed when you top up — the tank simply holds more of the same blend. The assumption behind the guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: a newer diesel copes with a bit of petrol. Rather, the opposite. A modern diesel sends its fuel through smaller components at higher pressure, which makes the lubrication count more, not less.
One myth that catches people out: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it usually will not run, and so the motorist stops — and the damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile your pump wears. Being able to run isn't the same as being fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a distinct issue. It doesn't put back what petrol has weakened, and the petrol is still inside your tank later.
If the motor has been run, part of that petrol is in the filter and the lines, not that tank — and your next start pulls it straight back through the pump. So the myth "drain the tank yourself and you are sorted" does not stand up. It is also really hazardous to drain petrol into a can at the kerbside.
Why petrol in a diesel happens at all
No one does it on purpose, and it's seldom carelessness. A diesel nozzle mostly won't go into a petrol motor, yet the slimmer petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake simple, and only in one direction.
Routine and the vehicle getting out of step is when it occurs. Hire cars, courtesy cars, and motors that are new to you. Two vehicles on one drive, one petrol, one diesel. The pumps in a different order on a well-known forecourt. Filling up in a hurry en route to Frizinghall, with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist used to petrol: precisely when it happens. Throw in rain, a phone call or a back seat full of children, and your hand repeats what it has always done.
Hill Top people: how to prevent petrol in a diesel next time
- A green handle for unleaded and black for diesel is usual in the UK — but not on every forecourt. Trust the label on the pump, not the colour.
- Check your filler flap. Many vehicles state the fuel type inside the flap or on the cap. Look at it on your first fill in any motor you do not know.
- Good intentions count for less than a sticker or a fob in a bright colour on the diesel's key when a house has one of each. So mark it.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump. It sounds daft and it does the trick.
- Whilst you're thinking about something else, this is an easy mistake to make — so put the phone away.
- Add-on devices exist for vehicles without one, and some diesels come with a filler that will not take a petrol nozzle. Helpful — but a backstop only, never a reason to stop checking the label.
- As soon as you notice, stop: less petrol inside your tank makes a weaker blend. What to do next doesn't change, though — still don't crank it.
Put petrol in a diesel in Hill Top already?
Then, there's only a short order of things. Don't switch the ignition on, and do not crank it. Ask the staff to help you push it clear of the petrol pump if you are still at the forecourt, whether that's Esso or anywhere else. Call 0333 366 0103 next, with three facts — your fuel, the rough quantity, and if it's run.
If it was AdBlue instead of petrol, say so. That is a separate issue — corrosion and deposits rather than lost protection — and it has its own page for Hill Top.
Why one petrol in a diesel job around Hill Top costs more than another
There's no honest single price for this, since the four situations above are four separate tasks. What moves the cost is chiefly which of them you are in. Where your car is matters too, and whether our van can safely reach it, after the ratio of petrol to what the tank takes.
Three queries come first, before quoting, rather than after — what was put in, how much, has it run — and that is the reason. A range turns into a straight figure when those answers are in.
About Hill Top
Hill Top is a suburban area situated on the outskirts of Bradford in West Yorkshire, with a riverside setting and an elevation of 259 metres. Hill Top is characterized by its semi-detached housing stock, which is typical of many suburban areas in the region. Hill Top is located near several other local places, including Stony Lane, Allerton, and Leaventhorpe, and is approximately 3.2 miles from the city centre of Bradford.
Fuel drain cover in Hill Top and across West Yorkshire
Stony Lane, Allerton and Leaventhorpe are among the spots around Hill Top that the same vans work, answering petrol in diesel call-outs across Hill Top's BD postcode area. The vehicle doesn't need to move to us: we drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Hill Top: still at the petrol pump?
In that case, you couldn't be in a better place. Call, and keep it turned off.