Egerton Park: Petrol in a Diesel Car? How Worried to Be
Likely less than you already are — as long as nobody has started it. "Have I ruined it?" is the first question anyone around Egerton Park asks, and the honest answer is generally no, because petrol left in a diesel tank harms nothing until it is drawn through the system — by ignition priming, by the starter, or by driving. Leave the motor off and ring Petrol in Diesel — that is how you keep it that way. What petrol actually does to a diesel, how to gauge how far it's travelled, and how to stop it from happening again: that is the rest of this page.
Your engine and petrol in a diesel: what goes on
Passing through an engine, diesel does two things at the same time. Before it combusts, it lubricates — and then it ignites. What stops the surfaces inside the high-pressure pump and the injectors from wearing down against one another is the diesel flowing through them — they are built to very fine tolerances.
Badly at the first, not at all at the second: that's petrol. It's thinner than diesel and removes the lubrication the fuel system depends on, so a pump running on a petrol mix is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That is where the knocking comes from.
The shape of the issue is plain when you put those together. It is movement that does the damage, not contact. A tank with petrol in it is a fuel fault. Once your pump has been running on that petrol, a mechanical problem has begun: anything shed by a pump that's grinding is carried downstream to the injectors with your fuel.
Four situations our engineers see in Egerton Park: how bad is petrol in a diesel?
Fuelled but not once started — the best it gets. Being at a forecourt is what makes this the case: elsewhere, the car has been driven there to begin with. With the petrol kept inside that tank alone, it's drained and purged right where it stands, and nothing more is needed.
The ignition switched on, or a short start. Your system has been bled, and so petrol has left your tank and reached the fuel filter and the fuel lines. Normally little more than draining, cleaning and seeing to the filter, and so still easy.
Driven a few miles. Now the pump has spent these miles running on weakened fuel. The work is your tank, the fuel lines, the filter and fresh fuel through the entire circuit, and how hard the vehicle was driven matters as much as how far. The school run to Broadoak Primary School is one thing. A run as far as Salford, under 5 miles away, is a very different task. So is any miles on the M60, under a mile from Egerton Park, where the motor has been working hard the whole time.
Rattling, an uneven idle, smoke, a throttle gone soft: driven until it complained. The engine is telling you the fuel is no longer acting like diesel. Leave it where it has stopped: a lay-by, a side street, the verge on Longley Drive. Lasting damage is very uncommon if a vehicle is stopped soon, and the fuel drain and flush that still come first take care of it.
Petrol in a diesel stories Egerton Park drivers hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Topping up removes nothing; it gives you a fuller tank of the same mix. That advice presumes a diesel fuel system tolerates petrol by percentage. It does not.
Myth: a current diesel copes with a bit of petrol. Rather, the opposite. At higher pressure, through more precise components: that's how a current diesel handles its fuel, and so the protection counts more, not less.
"It starts, it drives, and so no harm done" — the myth that catches more motorists than any other. Diesel in a petrol motor generally leaves a motor that will not run: the driver stops, and so does the damage. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually will; meanwhile your pump wears. Fine and running aren't the same at all.
Myth: "Add some two-stroke oil and drive the car home." It's an outdated fix for a different problem. That petrol is still in your tank after that, and whatever it has diluted isn't put back.
Once the engine has been run, part of that petrol is in the filter and the lines, not that tank — and the next start pulls it right back through your pump. So the myth "drain the tank yourself and you are sorted" does not hold. Also, a can of petrol filled by the roadside is truly risky.
How does petrol in a diesel happen?
It's seldom carelessness, and no one does it on purpose. The petrol nozzle is the slimmer of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol motor at all. The forecourt makes it easy, and the slip runs one way.
The moment habit stops matching your car is the moment it takes place. Courtesy car, hire car, or a car that is brand new. A household with one petrol and one diesel on the drive. Your usual forecourt, its pumps suddenly in a different order. Filling up in a rush on the way to Moorside, with a train to catch. A new-to-you diesel Renault Megane, its first fuelling, and a motorist accustomed to petrol: precisely when it takes place. The hand does what it has always done when you add rain, a phone call or a back seat full of children.
Preventing petrol in a diesel next time you fill up in Egerton Park
- A green handle for unleaded and black for diesel is normal in the UK — yet not on each forecourt. Go by the label on the pump, not the colour.
- The first fill in a new motor is the time to check the filler flap — inside it, or on the cap, many motors state the fuel to use.
- Good intentions do less than a sticker or a fob in a bright colour on the diesel's key if a household has one of each. So mark it.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It sounds daft and it works.
- Whilst you are thinking about something else, this is an easy mistake to make — so put your phone away.
- Add-on devices exist for cars without one, and some diesels are built with a filler that will not take a petrol nozzle. Useful — but a safety net only, never a reason to stop checking the label.
- Less petrol means a weaker blend, so stop as soon as you notice — though remembering that your next stage is unchanged. It is still not to fire it up.
Already put petrol in a diesel in Egerton Park?
Then the order of things is short. Do not turn the ignition on, and don't crank it. Yet at the forecourt, at Shell or anywhere else? Ask the attendants to help you push the vehicle clear of the pump. Then call 0333 366 0103 and tell us what was put in, about how much, and whether it's run.
Corrosion and deposits form the issue with AdBlue, where petrol means lost protection. So if it was AdBlue, say so — and read its own Egerton Park page.
What makes one Egerton Park petrol in a diesel task cost more than the next
There is no honest single price for this, because the four scenarios above are four different tasks. Mostly, your cost moves with which one you are in. Beyond that it is the ratio — how much petrol was put in against how much that tank takes — and after that where your car is and whether a van can reach it safely.
That's why our engineers ask three questions before pricing instead of after: what was put in, how much, and whether it's run. Their replies are what change a range into one firm number.
About Egerton Park and its setting
Egerton Park is a suburban area in Greater Manchester, situated near the River Irwell and close to the city of Salford. Egerton Park has a mix of housing types, but semi-detached homes are the most common, and it is located near other residential areas such as Broad Oak and Broadoak Park. Egerton Park sits at an elevation of 53 metres, relatively low compared to other parts of the region, and it is about 3.4 miles from Salford city centre. Egerton Park is part of the larger North West England region, about 167 miles from London.
Fuel drain cover across Greater Manchester, Egerton Park included
Broad Oak, Broadoak Park and Hazelhurst are among the locations around Egerton Park that the same teams work, answering petrol in diesel calls across Egerton Park's M postcode area. Our engineers drain where your vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Egerton Park: still at the pump?
Then you are in the best position there is. Ring, and keep it turned off.