Guisborough: Petrol in a Diesel Car? How Worried to Be
Less than you likely are, provided it has not been started. "Have I wrecked it?" is the first thing anyone around Guisborough asks, and the honest answer is normally no, because petrol left in a diesel tank hurts nothing till it's drawn through your fuel system — by ignition priming, by the starter, or by driving. Leave the engine off and ring Petrol in Diesel — that keeps it that way. The remainder of this page explains what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you a second time.
Your engine and petrol in a diesel: what goes on
Passing through a motor, diesel is doing two things at once. Before it burns, it lubricates — and then it combusts. What stops the surfaces inside the high-pressure pump and your injectors from wearing down against one another is your diesel flowing through them — they are built to extremely fine clearances.
Petrol does the first task poorly and the second not at all. A pump running on a petrol blend is wearing itself out, because petrol is runnier than diesel and strips out the protection the fuel system relies on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that's where the rattling starts.
Taken together, they show the shape the problem takes. Not contact but circulation is what does the damage. Petrol in a tank is a fuel fault. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with the fuel to the fuel injectors downstream.
How serious is petrol in a diesel? Four situations our engineers see in Guisborough
Fuelled, and not started: no case is better. At a forecourt, and really only there, that petrol is still limited to your tank — because anywhere else the car was driven to get to it. The task is emptying and purging on the spot.
Ignition on, or started for a moment. With the fuel system primed, the lines and filter already hold petrol that came from your tank. Usually nothing more than emptying, flushing and seeing to the fuel filter, so still easy.
Those few miles on the road were your pump running on fuel diluted by petrol throughout. How hard your car was driven counts as much as how far, and this work takes in your tank, your lines, the fuel filter and clean fuel through the whole system. On the school run to Chaloner Primary School, the distance is short. A run as far as Durham, under 50 miles away, is a very different job. So is any miles on the A1(M), under 25 miles from Guisborough, where the engine has been labouring hard throughout.
Clattering, a lumpy idle, smoke, a throttle gone soft: driven until it complained. What you are hearing is the engine signalling fuel that no longer acts like diesel. Stop where you are — on the verge on Church Street, at the kerb, down a side road — and do not move it. A vehicle pulled over early very rarely has permanent damage, as the fuel drain and the flush, which still come first, take care of it.
Myths Guisborough drivers hear about petrol in a diesel
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 bigger tank of the same mixture. A diesel fuel system does not accept petrol by percentage in the way that advice assumes.
Not so: a newer diesel copes with a bit of petrol. If anything, the reverse. A current diesel runs its fuel through smaller parts at higher pressure, which makes the protection count more, not less.
This is the one that fools drivers. Myth: "If it starts and drives, there is no damage done." Diesel in a petrol motor generally leaves a motor that won't run: the driver stops, and so does the harm. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile the pump grinds. Being able to run is not proof of being fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a different issue. What petrol has weakened stays thinned, and that petrol stays inside the tank regardless.
Myth: "Drain that tank yourself and you're sorted." After your engine has been run, some of the petrol is no longer inside your tank: it is in the fuel filter and the fuel lines, and it goes straight back through your pump on your next start. Draining petrol into a can by the roadside is also truly dangerous.
How does petrol in a diesel happen?
On purpose? Never. Through carelessness? Seldom, if ever. A diesel nozzle mostly won't fit a petrol car, yet the smaller petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error easy, and just in that direction.
Routine and the car getting out of step is how it takes place. A vehicle that is new to you — a hire car, on loan as a courtesy car, or brand new. One petrol and one diesel on the driveway of the same household. The pumps in a different order on a familiar forecourt. Racing for a train at Marske and fuelling up en route. Years of petrol motors behind you, a diesel Volkswagen Tiguan in front of you at the forecourt for its first tank — that's when. Add a back seat full of kids, a phone call or rain, and the hand wins.
Guisborough people: how to avoid petrol in a diesel next time
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most generally do. Read the pump's label; the colour is just a clue.
- Plenty of cars state the fuel inside the filler flap or on the cap, so check it on the first fill in a car you don't know.
- A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, in a household with one of each.
- It seems silly and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump.
- Thinking about something else is when this becomes an easy mistake to make, so tuck your phone away then keep your mind on the pump.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to block a petrol nozzle, and add-on devices are available for vehicles without one. They are a backstop, not a reason to stop reading the pump.
- Noticing it halfway? Stop there and then. A thinner mix results from less petrol inside the tank, yet your next stage stays the same: do not start the vehicle.
Guisborough: already put petrol in a diesel?
Then the order of things is short. Leave it unstarted, with the ignition off too. If you are still on the forecourt — Esso or anywhere else — ask the attendants to help you roll the car away from the pump. Then phone 0333 366 0103 and tell us what was put in, roughly how much, and if it's run.
If it was AdBlue rather than petrol, say so. That's a different problem — corrosion and deposits instead of lost lubrication — and it has its own page for Guisborough.
What makes one Guisborough petrol in a diesel job cost more than the next
Four different tasks lie behind the four scenarios above — which is why there's no honest single price. The situation itself does most of the work of moving the cost. After that it's the share — how much petrol was put in against how much that tank takes — and after that where your car is and whether a technician can get to it safely.
That is why our engineers ask three questions before costing instead of after: what was put in, how much, and if it has run. The answers turn a range into a straight figure.
About Guisborough and its setting
Guisborough is a town situated on the banks of the River Tees in North Yorkshire, with a population of around 13431 people. Guisborough sits at an elevation of 96 metres, surrounded by nearby places such as Hutton Gate, Hutton Village, and Dunsdale. Guisborough has a mix of housing types, but semi-detached homes are the most predominant. Guisborough is located approximately 27 miles from the city of Durham and 212.7 miles from London.
Across North Yorkshire and around Guisborough: fuel drain cover
Guisborough rests in the TS postcode area, and our vans that answer petrol in diesel calls there work the locations around it as well — Hutton Gate, Hutton Village and Dunsdale among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all places our engineers drain, and the car does not need to move to us.
In Guisborough and still at the pump?
In that case, you couldn't be in a better place. Keep it off. Ring.