Skip to content

Petrol in Diesel

0333 366 0103

Should You Worry? Petrol in a Diesel Car in Broadfield

Likely less than you are now — provided nobody has started the vehicle. Petrol resting in a diesel tank does nothing to your motor until something pulls it through the system — your ignition priming the pump, the starter, or driving on its own. So the honest answer to the first query everyone in Broadfield asks, "have I ruined it?", is usually no. To leave it like that, phone Petrol in Diesel then leave your motor switched off. Keep reading for three things: the effect petrol has inside a diesel engine, the signs of how far it has got, and ways to make sure you don't do it again.

Call 0333 366 0103

What petrol in a diesel does to the motor

Diesel has two jobs on its way through an engine. It protects first, and only then does it burn. Extremely fine clearances are built into the fuel injectors and the high-pressure fuel pump, and just your diesel running through stops their surfaces grinding together.

The second job petrol does not do at all, and the first it does poorly. It is thinner than diesel and strips away the protection your fuel system hinges on, and so a pump running on a petrol mixture is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That is where the clattering comes from.

Together, those make the shape of the issue plain. Not contact but circulation is what does the harm. All a tank with petrol in it amounts to is a fuel problem. The beginning of a mechanical problem is a pump that has been labouring on that petrol — and whatever a worn pump sheds travels on with your fuel to the fuel injectors downstream.

Petrol in a diesel around Broadfield: how bad is it? Four situations

Filled but never started — the best it gets. Being on a forecourt is what makes this the case: elsewhere, the vehicle has been driven there to begin with. With that petrol kept inside your tank alone, it is cleared and flushed on the spot, and nothing more is needed.

Ignition on, or started for a second. Once primed, the system has pulled petrol from your tank as far as your filter and the lines. That is generally still a straightforward job — a drain, a flush, and your filter dealt with.

Those few miles driven meant the pump running on fuel thinned by petrol the whole way. Mileage is only half of it; how hard it was driven counts just as much. Either way this work runs to your tank, the fuel lines, your filter and fresh fuel through the entire circuit. Short trips, like the school run to St Peter's CofE Primary School, are one thing. Very different once more: a run to Preston, under 15 miles away, or some distance on the M65, under 3 miles from Broadfield, where the motor kept labouring hard.

Driven on till it complained — rattling, smoke, a ragged idle, a soft throttle. That's your engine telling you its fuel has stopped behaving like diesel. Stop where you are — on the verge on Broadfield, at the kerb, down a side road — and do not move it. A car pulled over soon very rarely has permanent damage, since the drain and the flush-through, which still go first, sort it out.

Diesel fuel system after petrol in the tank, Broadfield

Petrol in a diesel myths Broadfield drivers hear

Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing is removed by topping up — you are left with a bigger tank, still the same mixture. The idea behind the guidance — that diesel fuel systems accept petrol by percentage — is wrong.

"Newer diesels can handle a little petrol" — a myth, and nearer the opposite. Lubrication counts more on newer diesels, not less, since their fuel passes through smaller parts at higher pressure.

One myth that catches motorists out: if it starts and drives, it must be unharmed. A petrol motor fed diesel normally won't run, and so the driver stops and the harm stops with them. A diesel fed petrol generally starts, idles and drives away as if nothing has happened, whilst the pump wears. A running engine does not mean fine.

"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a distinct problem. What petrol has diluted stays thinned, and the petrol stays in that tank anyway.

"Drain it yourself and you're sorted" — a myth, because after it has been running some petrol sits in your filter and lines, ready to go right back through the pump on your next start. Also, a can of petrol filled at the roadside is truly hazardous.

Petrol in a diesel: how does it happen?

Nobody does it on purpose, and it is rarely carelessness. One way only, since of the nozzles: the smaller petrol one slips inside a diesel filler with almost no resistance, while the diesel one mostly will not fit a petrol vehicle. That's how the forecourt makes it straightforward.

It occurs when routine and the car stop matching. Hire cars, courtesy cars, and vehicles that are new to you. One petrol and one diesel on the drive of the same household. A well-known forecourt with the pumps in a different order. A rushed fill on the way to Church & Oswaldtwistle with a train to catch. A new-to-you diesel Skoda Octavia, its first fuelling, and a motorist used to petrol: exactly when it occurs. With rain, a call coming in, or a car full of children to deal with, the hand simply does what it has always done.

Preventing petrol in a diesel next time you fill up in Broadfield

  • Read the petrol pump, not the colour. In the UK unleaded handles are normally green and diesel black, but not on each forecourt. The label is what counts.
  • In a car you don't know, look inside the flap over your filler or at the cap before your first fill: many vehicles state the fuel type there.
  • Good intentions count for less than a sticker or a fob in a vivid colour on the diesel's key if a house has one of each. So label it.
  • "Diesel", out loud, before you lift the nozzle — every time a new or hired car needs its first tank. It sounds silly. It works.
  • Mistakes like this are easy to make while your mind is on something else, so the phone goes away.
  • Some diesels come with a filler designed to refuse a petrol nozzle, and devices you can add exist for motors without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop checking the pump.
  • Noticing it halfway? Stop at once. A weaker blend results from less petrol inside the tank, but your next step stays the same: do not start the car.

Already put petrol in a diesel around Broadfield?

The order of things is brief, then. Starting it is out, and so is turning on the ignition. If you're still on the forecourt — Esso or anywhere else — ask the staff to help you roll the vehicle away from the pump. What went in, roughly how much, and if it's run: tell us that when you phone 0333 366 0103.

Corrosion and deposits form the trouble with AdBlue, whereas petrol means lost protection. So if it was AdBlue, say so — and see its own Broadfield page.

Why one petrol in a diesel job around Broadfield costs more than another

There is no fair single price for this, because the four situations above are four different tasks. What shifts the cost is chiefly which of them you are in. Two things come after that: the petrol that went in as a share of what the tank holds, then the spot the car is in and whether a van can reach it safely.

What got in, how much, and if it has run — three questions our engineers ask before quoting, not after, for exactly that reason. Given the replies, there is a straight figure rather than a range.

About Broadfield itself

Broadfield is a suburban area in Lancashire, situated near the River Ribble and characterised by semi-detached housing. Broadfield sits at an elevation of 207 metres, overlooking the surrounding countryside. Broadfield is located near several smaller communities, including Hoyle Bottom and Miller Fold, and is approximately 13 miles from Preston. Broadfield is a relatively small suburban area, with a population of around 1723 residents.

Fuel drain cover around Broadfield and across Lancashire

Hoyle Bottom, Dunnyshop and Miller Fold are among the locations around Broadfield that the same teams work, answering petrol in diesel call-outs across Broadfield's BB postcode area. A forecourt, a supermarket car park, a lay-by or your own driveway are all locations our engineers drain, and your vehicle does not need to come to us.

Broadfield: still at the pump?

No position is better: that is where you now are. Leave the vehicle turned off, then ring.

Call 0333 366 0103