Petrol in a Diesel Car in Boythorpe: How Worried Should You Be?
Less than you likely are, provided it hasn't been started. Till your ignition primes the pump, your starter cranks, or the car is driven, petrol in a diesel tank simply rests there and does no harm. Which makes the honest reply to the first Boythorpe question — "have I ruined it?" — normally no. To leave the car like that, phone Petrol in Diesel then leave your motor alone. Below, you will find what petrol actually does inside a diesel, how far it may have gone, and how to stop it happening to you a second time.
Inside your engine: what petrol in a diesel does
Two tasks fall to diesel on its journey round a motor. It protects to begin with, and after that does it burn. Very fine tolerances are built into the injectors and your high-pressure pump, and only your diesel running through keeps their surfaces from grinding together.
The second task petrol doesn't do at all, and the first it does badly. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, so a pump on the blend wearing itself. It's also made to resist igniting under compression — the opposite of what a diesel needs — which is why you get the clattering.
Together, those leave the shape of the problem clear. Not contact but circulation is what does the damage. A tank with petrol in it is a fuel issue. After the pump has been running on that petrol, a mechanical fault has started: whatever is shed by a pump that is wearing travels onward to the fuel injectors with the fuel.
Boythorpe, petrol in a diesel: four situations, from mild to major
Filled but never started — the best it gets. That petrol is in the tank and only the tank, and the job is a drain and a flush where the car sits. This is the one scenario that can only truly occur at a forecourt, because anywhere else your car has been driven to get there.
Your ignition switched on, or a brief start. Your system has been bled, and so petrol has left that tank and got to the filter and the fuel lines. Still usually simple: drain, flush, and the fuel filter dealt with.
Some miles driven, and your pump has spent each of them labouring on weakened fuel. The work is your tank, your lines, your filter and clean fuel through the entire system, and how hard the car was driven counts as much as how far. On the school run to William Rhodes Primary and Nursery School, the mileage is small. Driving as far as Sheffield, under 15 miles away, makes a very different job — as does any miles on the M1, under 5 miles from Boythorpe, with your engine running hard the whole time.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone uneven. The fuel isn't acting like diesel any more, and the motor is telling you. Pull up on the spot — on the verge on Central Avenue, at the kerb, down a side road — and don't move it. Permanent damage is very uncommon when a car is stopped soon, and the fuel drain and flush-through that still go first deal with it.
What Boythorpe people get told about petrol in a diesel — and the stories in it
Myth: topping up to full with diesel makes it fine. It doesn't. Nothing is removed by topping up — you are left with a bigger tank, still the same mixture. Percentage isn't how a diesel fuel system copes with petrol, however much that guidance presumes.
Myth: a current diesel copes with a bit of petrol. If anything, the reverse. A modern diesel sends its fuel through finer components at higher pressure, which makes the lubrication matter more, not less.
This is the one that fools drivers. Myth: "If it starts and drives, there's no damage done." Any petrol motor fed diesel generally will not run, so the motorist stops and the damage stops with them. Feed petrol to a diesel and it normally starts, idles and drives away like nothing has happened — all while its pump is wearing. Fine and running aren't the same at all.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a separate issue. That petrol is still in that tank after that, and whatever it has weakened isn't put back.
Once your engine has been run, part of that petrol sits in the fuel filter and the lines, not that tank — and the next start pulls it right back through the pump. So the myth "drain your tank yourself and you're sorted" doesn't stand up. Draining petrol into a can at the kerbside is also really risky.
Why petrol in a diesel happens so easily
It is rarely carelessness, and no one does it on purpose. One way only, because of the nozzles: the slimmer petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one generally won't fit a petrol car. That's how the forecourt makes it easy.
Habit and your car falling out of step is when it happens. Hire cars, courtesy cars, and cars that are new to you. One petrol and one diesel on the drive of the same household. Your usual forecourt, its pumps suddenly in a different order. Filling up in a hurry en route to Chesterfield, with a train to catch. A new-to-you diesel Renault Megane, its first fuelling, and a driver accustomed to petrol: precisely when it happens. The hand repeats 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 Boythorpe
- Read the pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on every forecourt. The label is what counts.
- Plenty of vehicles state the fuel inside the filler flap or on the cap, and so check there on your first fill in a vehicle you don't know.
- A coloured fob or a sticker on your diesel's key does more than any amount of intending to remember, for a house with one of each.
- Before the nozzle comes off the petrol pump the first time you fill a hired or new motor, say "diesel" out loud. Silly, yes, but it works.
- Put the phone away. This is an easy mistake to make while you are thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler designed to refuse a petrol nozzle, and add-on devices are available for vehicles without one. They are a backstop, not a reason to stop checking the petrol pump.
- Noticing it mid-fill? Stop at once. A weaker mix results from less petrol inside your tank, yet the next stage stays the same: do not start it.
Petrol already in a diesel around Boythorpe? Start here
Short and simple, then, is the order of things. Leave it unstarted, with your ignition off as well. The attendants on the forecourt — whether at Chesterfield Autogas Ltd itself or wherever you filled up — will normally help roll it clear of the petrol pump if you ask. Phone 0333 366 0103 next, with three answers — the fuel, the rough quantity, and whether it has run.
Corrosion and deposits are the problem with AdBlue, whereas petrol means lost lubrication. So if it was AdBlue, say so — and read its own Boythorpe page.
Why one petrol in a diesel job around Boythorpe costs more than another
Four separate jobs sit behind the four situations above — which is why there is no honest single quote. The scenario itself does most of the work of moving the cost. Two things come after that: the petrol that got in as a share of what your tank takes, then the place the vehicle is in and whether a van can reach it safely.
That's why our engineers ask three queries before costing rather than after: what went in, how much, and whether it has run. Those replies are what turn a range into one firm number.
About Boythorpe, for a moment
Boythorpe is a suburban area in Derbyshire, situated near the River Rother and close to the city of Sheffield. Boythorpe has a mix of housing types, but semi-detached homes are the most common, and its population is around 3665 residents. Boythorpe is located near several other suburbs, including Brampton and St Augustines, and is about 10 miles from Chesterfield. Boythorpe sits at an elevation of 117 metres above sea level, in a riverside setting that is characteristic of the area.
Fuel drain cover across Derbyshire, Boythorpe included
Brampton, St Augustines and Chesterfield are among the locations near Boythorpe that the same teams work, answering petrol in diesel call-outs across Boythorpe's S postcode area. Our engineers drain wherever the vehicle is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
At the pump in Boythorpe, right now?
Then you're in the best position there can be. Ring, and keep it switched off.