Clitheroe: Petrol in a Diesel Car? How Worried to Be
Less than you probably are, if it hasn't been started. Everyone around Clitheroe starts with "have I wrecked it?", and the fair answer is generally no: petrol left in that tank of a diesel remains harmless till priming, cranking or driving pulls it into your fuel system. To keep the vehicle like that, ring Petrol in Diesel then leave your motor alone. Keep reading for three things: the effect petrol has inside a diesel engine, the signs of how far it has spread, and the way to make sure you never repeat it.
Petrol in a diesel: what does it do to the motor?
On its way through a motor, diesel does two jobs. Before it ignites, it protects — then it ignites. What stops the surfaces inside the high-pressure fuel pump and the injectors from grinding against each other is the diesel flowing through them — they are made to extremely fine gaps.
Of those two tasks, petrol manages the first badly and the second not at all. It's thinner than diesel and removes the lubrication the fuel system rests 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 rattling comes from.
Together, those make the shape of the problem plain. It is movement that does the harm, not contact. Any tank with petrol in it is a fuel issue. Whatever a worn pump sheds goes on, carried by the fuel, into the fuel injectors further along, which is why a pump that has been working on that petrol is where a mechanical issue begins.
Petrol in a diesel in Clitheroe: how bad is it? Four cases
Filled up, never started. The best case there can be. Being at a forecourt is what makes this the case: elsewhere, your car has been driven there to begin with. With that petrol held in your tank alone, it's drained and rinsed on the spot, and nothing more is needed.
A moment's running, or merely your ignition on. Petrol has left the tank and reached the filter and your lines, because your system has been bled. Drain, flush, deal with the filter: still usually easy.
A few miles driven, and your pump has spent every one of them working on diluted fuel. How hard the car was driven matters as much as how far, and this work takes in that tank, the lines, the filter and clean fuel through the entire circuit. On the school run to Clitheroe Pendle Primary School, the miles is small. Very different again: a run to Preston, under 15 miles away, or some miles on the M65, under 10 miles from Clitheroe, where the motor never stopped labouring hard.
Driven on till it complained — clattering, smoke, an uneven idle, a soft throttle. The engine is telling you the fuel is no longer acting like diesel. Pull up on the spot — on the verge on A671, at the kerb, down a side road — and do not move it again. A car pulled over soon very seldom has long-term damage, because the drain and the flush-through, which still go first, deal with it.
What Clitheroe people get told about petrol in a diesel — and the stories in it
False: topping up to full with diesel makes it fine. It doesn't. Nothing comes out when you top up — that tank simply carries more of the same mixture. Percentage is not how a diesel fuel system copes with petrol, however much that guidance assumes.
If anything, the opposite is true. Myth: "A current diesel can cope with a bit of petrol." Lubrication counts more on current diesels, not less, since their fuel passes through smaller components at higher pressure.
This is the one that fools drivers. Myth: "If it starts and drives, there is no damage done." The motorist of a petrol motor fed diesel normally has no choice but to stop, because it will not run, and the harm stops there. Whilst your pump grinds, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. Fine and running aren't the same thing.
An outdated workaround for a separate problem is behind this one. Myth: "Add some two-stroke oil and drive the car home." It doesn't put back what petrol has thinned, and the petrol is still inside your tank afterwards.
Once the engine has been run, part of that petrol sits in your filter and the lines, not your tank — and the next start pulls it straight back through your pump. So the myth "drain your tank yourself and you are sorted" doesn't hold. Emptying petrol into a can at the kerbside is also truly hazardous.
Why petrol in a diesel happens at all
Carelessness is seldom the cause, and nobody means to do it. A diesel nozzle mostly will not go into a petrol motor, but the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error easy, and just in that direction.
Routine and your car getting out of step is when it happens. Courtesy car, hire car, or a car that's brand new. Two motors on one driveway, one petrol, one diesel. The pumps in a different order on a well-known forecourt. Filling up in a hurry on the way to the nearest station, with a train to catch. Exactly the moment it occurs: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. Your hand does what it has always done once you add rain, a phone call or a back seat full of kids.
How to prevent petrol in a diesel on your next fill-up in Clitheroe
- The label is what counts, so read the petrol pump rather than the colour: in the UK unleaded handles are normally green and diesel black, yet not on each forecourt.
- The first fill in an unfamiliar motor is the time to check your filler flap — on it, or on the cap, plenty of motors state the fuel they take.
- A coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember, in a household with one of each.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the petrol pump. It seems silly and it works.
- Tuck the phone away. This is an easy mistake to make whilst you're thinking about something else.
- Add-on devices exist for motors without one, and some diesels are built with a filler that won't take a petrol nozzle. Useful — but a safety net only, never a reason to stop checking the label.
- Less petrol means a thinner mix, and so stop the moment you notice — though remembering that the next step is unchanged. It's still not to crank it.
Clitheroe: already put petrol in a diesel?
Then, there is only a short order of things. Starting it is out, and so is turning on the ignition. Ask the staff to help you push it away from the pump if you are still at the forecourt, whether that's Esso or somewhere else. Next, 0333 366 0103. We'll ask what was put in, about how much, and if it's been run.
If it was AdBlue and not petrol, say so. That's a different problem — corrosion and deposits rather than lost lubrication — and it has its own page for Clitheroe.
One petrol in a diesel task around Clitheroe costs more than another. Why?
The four scenarios above are four separate tasks, so no single price for this would be honest. What moves the cost is mostly which of them you are in. Where the car is matters too, and whether our van can safely get to it, after the proportion of petrol to what the tank takes.
That's why we ask three questions before costing instead of after: what got in, how much, and whether it's run. Given the answers, there is a straight figure rather than a range.
About Clitheroe, for a moment
Clitheroe is a town situated in the Ribble Valley in Lancashire, England, with a population of around 12580 people. Clitheroe sits on the River Ribble at an elevation of 89 metres, approximately 14.9 miles north of Preston. Clitheroe has a mix of housing types, but terraced houses are predominant. Clitheroe is located near several smaller communities, including Pimlico, Horrocksford, and Primrose.
Clitheroe and Lancashire: where our fuel drain cover reaches
Our teams answering petrol in diesel jobs in Clitheroe, in the BB postcode area, equally work the spots near it, Pimlico, Horrocksford and Primrose included. You need not bring the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all places we drain.
In Clitheroe and still at the petrol pump?
Then you are in the best position there is. Ring, and keep it turned off.