Should You Worry? Petrol in a Diesel Car in Glossop
Far less than you likely are, if it has not been started. Everyone around Glossop begins with "have I wrecked it?", and the fair answer is usually no: petrol resting inside the tank of a diesel stays harmless till priming, cranking or driving pulls it into the system. Petrol in Diesel is who to call, with the engine kept off, and so it remains that way. What petrol actually does to a diesel, how to gauge how far it's gone, and how to stop it from happening a second time: that's the rest of this page.
Inside the motor: what petrol in a diesel really does
Two tasks fall to diesel on its journey through a motor. Lubricating comes before burning; it does both. What keeps the surfaces inside your high-pressure pump and your injectors from wearing against one another is your diesel flowing through them — they are designed to extremely fine clearances.
Poorly at the first, not at all at the second: that is petrol. It is thinner than diesel and removes the protection your fuel system hinges on, and 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 reverse of what a diesel needs from its fuel. That's where the knocking comes from.
Put those together and the shape of the problem is plain. The harm is done by movement, not by contact. All a tank with petrol in it amounts to is a fuel fault. 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 the fuel to the fuel injectors downstream.
Four scenarios we see around Glossop: how serious is petrol in a diesel?
Filled up, and never started: nothing beats it. The petrol is in that tank and just the tank, and the job is a drain and a flush where the car stands. This is the one situation that can only really occur on a forecourt, since anywhere else the car has been driven to get there.
Ignition on, or started for a second. With your system primed, the lines and filter already contain petrol that came from that tank. Usually little more than draining, flushing and seeing to your filter, and so still straightforward.
A couple of miles driven, and the pump has spent each of them running on diluted fuel. Distance is only half of it; how hard it was driven counts equally. Either way this work runs to the tank, the lines, the fuel filter and fresh fuel through the entire system. Short trips, like the school run to Duke of Norfolk CofE Primary School, are one thing. A run as far as Manchester, under 15 miles away, is a very different job. So is any miles on the M67, under 5 miles from Glossop, where the motor has been labouring hard throughout.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone ragged. What you are hearing is your engine reporting fuel that no longer acts like diesel. Stop where you are — on the verge on Norfolk Street, at the kerb, down a side road — and don't move it. What comes first is still the fuel drain and flush-through, and that sorts it out, with long-term damage very uncommon when a vehicle is stopped quickly.
Glossop people and that petrol in a diesel stories they hear
Myth: topping up to full with diesel makes it fine. It doesn't. Topping up takes out nothing; it gives you a bigger tank of the same mixture. That advice presumes a diesel fuel system tolerates petrol by percentage. It does not.
Myth: a newer diesel copes with a bit of petrol. If anything, the opposite. Lubrication matters more on current diesels, not less, because their fuel passes through finer components at higher pressure.
Myth: "If it starts and drives, there is no damage done." This is the one that catches drivers. Any petrol motor fed diesel usually will not run, and so the driver stops and the damage stops with them. Feed petrol to a diesel and it normally fires up, idles and pulls away like nothing has happened — all while its pump is wearing. A running engine does not mean fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a different fault. It doesn't put back what petrol has thinned, and that petrol is still inside that tank later.
Myth: "Drain your tank yourself and you're sorted." After the motor has run, some of the petrol is no longer in your tank: it's in the filter and the lines, and it goes straight back through the pump on the next start. On top of that, petrol drained into a can by the road is truly hazardous.
How does petrol in a diesel take place?
On purpose? Never. Through carelessness? Seldom, if ever. 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 won't go into a petrol vehicle at all. So the slip runs one way.
When routine and your car stop matching, it takes place. Courtesy car, hire car, or a car that is new. Two motors on one driveway, one petrol, one diesel. The pumps in a different order on a well-known forecourt. A train to catch, and a hurried fill en route to the nearest station. The first fill-up in a diesel Renault Megane after years of driving petrol is precisely the moment it occurs. Your hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
Glossop motorists: how to prevent petrol in a diesel next time
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, even if most usually do. Check the petrol pump's label; the colour is only a hint.
- The first fill in a new motor is the time to check the filler flap — inside it, or on the cap, many vehicles state the fuel to use.
- One of each in the household? Mark your key to your diesel — a coloured fob, a sticker — because intending to remember isn't enough.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the petrol pump. It sounds daft and it does the trick.
- Put your phone away. This is an easy mistake to make whilst you are thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to reject a petrol nozzle, and aftermarket devices are available for the rest. Count it as a backstop, then keep reading the pump.
- Spotting it halfway? Stop there and then. A weaker blend follows from less petrol in that tank, but the next stage stays the same: do not start it.
Put petrol in a diesel in Glossop already?
The order of things is brief, then. Starting it is out, and so is switching on your ignition. The attendants at the forecourt — whether at Esso itself or wherever you filled up — will usually help push it clear of the pump if you ask. Then ring 0333 366 0103 and tell us what got in, about how much, and if it has run.
Corrosion and deposits form the problem with AdBlue, where petrol means lost lubrication. So if it was AdBlue, say so — and read its own Glossop page.
Why one petrol in a diesel task around Glossop costs more than another
Four separate tasks sit behind the four situations above — which is why there is no honest single quote. Mostly, the cost moves with which one you are in. After that it's the proportion — how much petrol got in against how much your tank takes — and then where the vehicle is and whether our van can reach it safely.
What went in, how much, and whether it has run — three questions our engineers ask before costing, not after, for exactly that reason. A range becomes a straight figure once the replies are in.
About Glossop and its setting
Glossop is a town in Derbyshire, situated on the River Etherow and surrounded by the Pennine hills. Glossop sits at an elevation of 157 metres, with its terraced housing reflecting its industrial heritage. Glossop is located near several smaller communities, including Whitfield and Old Glossop, and is close to the city of Manchester. Glossop has a population of approximately 16551 people, making it a significant urban centre in the region.
Glossop and Derbyshire: where our fuel drain cover reaches
Whitfield, Whitfield Park and Old Glossop are among the places around Glossop that the same teams work, answering petrol in diesel call-outs across Glossop's SK postcode area. No need to move the car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots where we work.
Still at the pump around Glossop?
Then, you couldn't be in a better position. Leave the vehicle turned off, then ring.