How Worried Should You Be? Petrol in a Diesel Car in Bakestone Moor
Not started? Then less worried than you likely are. "Have I ruined it?" is the first question everyone in Bakestone Moor asks, and the honest answer is generally no, since petrol left in a diesel tank hurts nothing until it's dragged through the fuel system — by ignition priming, by the starter, or by driving. Petrol in Diesel is who to ring, with your engine kept off, so it stays that way. Further down, this page sets out what petrol really does inside a diesel, how far it may have got, and how to stop it happening to you again.
The motor and petrol in a diesel: what happens
Two tasks fall to diesel on its route round a motor. Oiling comes before burning; it does both. Very fine tolerances are built into the fuel injectors and your high-pressure pump, and just the diesel running through stops those surfaces grinding together.
The second task petrol does not do at all, and the first it does poorly. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, leaving a pump running on that mixture wearing itself. It's equally made to resist igniting under compression — the reverse of what a diesel needs — which is why you get the clattering.
Taken together, they make clear what shape the issue has. It's movement that does the harm, not contact. Petrol in a tank is a fuel issue. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with your fuel to the injectors further on.
How bad is petrol in a diesel? Four situations our engineers see in Bakestone Moor
Fuelled, and never started: nothing beats it. That petrol is in that tank and only your tank, and the job is a drain and a flush where your car stands. This is the one situation that can only truly occur at a forecourt, since anywhere else the car has been driven to get there.
Started for a moment, or just the ignition on. Petrol has come out of your tank and reached the filter and the fuel lines, since the fuel system has been primed. Normally nothing more than clearing, rinsing and seeing to the filter, so still easy.
Those few miles on the road were your pump running on fuel diluted by petrol throughout. Miles is only half of it; how hard it was driven matters equally. Either way this work includes your tank, your lines, your filter and fresh fuel through the entire system. Short trips, like the school run to Whitwell Primary School, are one matter. A run as far as Sheffield, under 15 miles away, is a very different task. So is any distance on the M1, under 5 miles from Bakestone Moor, where the motor has been running hard throughout.
Driven on until it protested — clattering, smoke, a lumpy idle, a soft throttle. The fuel isn't acting like diesel any more, and your engine is saying so. Leave it wherever it has stopped: a lay-by, a side street, the verge on Hillside Close. Long-term damage is very rare if a vehicle is stopped soon, and the drain and flush-through that still come first take care of it.
Petrol in a diesel stories Bakestone Moor people hear
False: topping up to full with diesel makes it fine. It does not. Nothing is removed by topping up — you are left with a bigger tank, still the same mixture. Percentage is not how a diesel fuel system tolerates petrol, however much that guidance supposes.
Myth: "A current diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through finer components: that's how a newer diesel handles its fuel, so the protection counts more, not less.
Myth: "If it starts and drives, there is no harm done." This is the one that fools people. Any petrol motor fed diesel usually will not run, and so the driver stops and the harm stops with them. Feed petrol to a diesel and it generally fires up, idles and drives away like nothing happened — all the while its pump is wearing. Running is not the same as fine.
Not so: a two-stroke additive makes it safe to drive home. It was an old workaround, supposed for another fault. None of what petrol thinned gets put back by it — and later, your tank still contains the petrol.
The next start draws petrol back round your pump out of your lines and your filter, where some of it sits after the motor has been run. That is why a DIY tank drain doesn't leave you sorted — a myth. On top of that, petrol emptied into a can by the road is truly dangerous.
How does petrol in a diesel occur?
Nobody does it on purpose, and it is rarely carelessness. The forecourt makes it simple: the petrol nozzle is the slimmer of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle generally will not go into a petrol car at all. So the mistake runs one way.
When routine and your car stop matching, it happens. A new motor, a hire car or a courtesy car. One petrol and one diesel on the driveway of the same household. A familiar forecourt with the pumps in a different order. Racing for a train outside Whitwell and filling up en route. Years of petrol motors behind you, a diesel Volkswagen Passat in front of you at the forecourt for its first tank — that is when. The hand does what it has always done when you add rain, a phone call or a back seat full of children.
Next time you fill up around Bakestone Moor: avoiding petrol in a diesel
- Green for unleaded and black for diesel is normal in the UK — yet not on every forecourt. Trust the label on the petrol pump, not the colour.
- The first fill in an unfamiliar vehicle is the time to check your filler flap — on it, or on the cap, many cars state which fuel they take.
- Good intentions do less than a sticker or a fob in a vivid colour on your diesel's key when 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" aloud before you lift the nozzle off the pump. It seems silly and it does the trick.
- Mistakes like this are straightforward to make while your mind is on something else, and so the phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to refuse a petrol nozzle, and aftermarket devices exist for the rest. Count it as a safety net, and keep checking the petrol pump.
- As soon as you realise, stop: less petrol inside your tank means a thinner mixture. What to do next doesn't change, though — still do not start it.
Bakestone Moor: already put petrol in a diesel?
The order of things is short, then. Do not turn the ignition on, and do not fire it up. Ask the attendants to help you push it away from the petrol pump if you are still at the forecourt, whether that's Tesco or somewhere else. What was put in, about how much, and if it has run: tell us that when you ring 0333 366 0103.
Say so if it was AdBlue instead of petrol: it's a different issue, with its own page for Bakestone Moor, because AdBlue brings corrosion and deposits rather than lost protection.
One petrol in a diesel task around Bakestone Moor costs more than another. Why?
Four different jobs sit behind the four scenarios above — which is why there is no fair single quote. The scenario itself does most of the work of moving the cost. Next it's the proportion — how much petrol was put in against how much your tank holds — and after that where your car is and whether a technician can reach it safely.
Ahead of any quote, not after, come three questions: your fuel that was put in, the amount, and if it's run. That is why. Those replies change a range into a straight figure.
About Bakestone Moor itself
Bakestone Moor is a locality in Derbyshire, situated inland at an elevation of 116 metres, approximately 12.6 miles from Sheffield. Bakestone Moor is characterized by its semi-detached housing and is located near other local places such as Whitwell and Hodthorpe. Bakestone Moor has a population of around 1444 residents and is about 130.9 miles from London.
Across Derbyshire and around Bakestone Moor: fuel drain cover
Petrol in diesel call-outs around Bakestone Moor — part of the S postcode area — go to vans that likewise cover the spots around it, Whitwell, Whitwell Common and Hodthorpe included. A forecourt, a supermarket car park, a lay-by or your own driveway are all places our engineers drain, and your car does not need to come to us.
Bakestone Moor: still at the pump?
No position is better: that's where you now are. Ring, and keep it turned off.