Eastrea: Petrol in a Diesel Car? How Worried to Be
Probably less than you already are — as long as no one has started the vehicle. "Have I wrecked it?" is the first thing everyone around Eastrea asks, and the truthful answer is generally no, since petrol resting in a diesel tank hurts nothing until it's dragged through the system — by ignition priming, by your starter, or by being driven. To leave the vehicle that way, call Petrol in Diesel and leave the engine switched off. Further down, this page sets out what petrol actually does inside a diesel, how far it might have got, and how to stop it happening to you again.
What petrol in a diesel does to the engine
On its way through a motor, diesel has two tasks. It ignites, and before it ignites it lubricates. The high-pressure pump and the injectors are designed to very fine tolerances, and the diesel passing through them is what stops those surfaces from grinding against one another.
Badly at the first, not at all at the second: that is petrol. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, leaving a pump on the mixture wearing itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is where you hear the rattling.
Taken together, they make clear the shape the problem takes. The damage is done by movement, not by contact. All a tank with petrol in it amounts to is a fuel issue. Whatever a worn pump sheds goes on, borne by your fuel, into your injectors downstream, which is why a pump that has worked on the petrol is where a mechanical fault starts.
Petrol in a diesel in Eastrea: how bad is it? Four situations
Fuelled, and never started: nothing beats it. Just that tank has petrol in it, and so the job is clearing the tank and cleaning the system where the vehicle sits. This situation can only truly happen on a forecourt: anywhere else, the car got there by being driven.
A brief spell of running, or merely the ignition on. Petrol has come out of that tank and got to the fuel filter and the lines, because the fuel system has been bled. That's usually still a simple task — a drain, a flush, and the fuel filter dealt with.
A few miles driven, and your pump has spent every one of them running on thinned fuel. The work is your tank, your lines, your filter and clean fuel through the whole circuit, and how hard the car was driven counts as much as how far. A school run to New Road Primary & Nursery School is one matter. A run as far as Peterborough, under 10 miles away, is a very different task. So is any miles on the Great North Road, under 10 miles from Eastrea, where the engine has been running hard throughout.
Driven on until it protested — rattling, smoke, an uneven idle, a soft throttle. The fuel isn't behaving like diesel any more, and the engine is saying so. Whether it is the verge on Springfields, a lay-by or a side road, stop where you are and leave it. What goes first is still the drain and flush-through, and that deals with it, with permanent damage very rare if a car is pulled over quickly.
Myths Eastrea motorists hear about petrol in a diesel
False: topping up to full with diesel makes it fine. It doesn't. Topping up removes nothing; it gives you a bigger tank of the same mix. Percentage isn't how a diesel fuel system tolerates petrol, however much that guidance presumes.
If anything, the reverse is true. Myth: "A modern diesel can cope with a bit of petrol." A current diesel sends its fuel through more precise components at higher pressure, which makes the lubrication matter more, not less.
This is the one that fools people. Myth: "If it starts and drives, there's no damage done." The motorist of a petrol motor fed diesel usually has no choice but to stop, since it will not run, and the damage stops with them. Whilst your pump wears, a diesel fed petrol normally starts, idles and drives away as though nothing has happened. Fine and running are not the same at all.
An old fix for a separate problem is behind this one. Myth: "Add some two-stroke oil and drive it home." None of what petrol diluted gets put back by it — and afterwards, your tank still contains that petrol.
Myth: "Drain the tank yourself and you are sorted." After the engine has run, some of that petrol is no longer in your tank: it is in the filter and the fuel lines, and it goes right back through your pump at the next start. It's also genuinely risky to drain petrol into a can by the kerbside.
How it happens: petrol in a diesel
Carelessness is rarely the cause, and no one means to do it. One way only, since of the nozzles: the slimmer petrol one slides inside a diesel filler with almost no resistance, while the diesel one mostly won't fit a petrol car. That is how the forecourt makes it simple.
When routine and the car stop matching, it occurs. A motor that is new to you — a hire car, on loan as a courtesy car, or brand new. Households running one of each, petrol and diesel. The pumps in a different order on a familiar forecourt. A rushed fill on the way to Whittlesea with a train to catch. Exactly the moment it happens: after years of driving petrol, someone fills a diesel BMW 3 Series for the first time. With rain, a call arriving, or a car full of children to deal with, the hand just does what it always has.
Eastrea drivers: how to avoid petrol in a diesel next time
- Not every forecourt in the UK follows green for unleaded and black for diesel, even if most usually do. Read the pump's label; the colour is just a clue.
- The first fill in an unfamiliar motor is the time to check the filler flap — on it, or on the cap, plenty of vehicles state the fuel to use.
- 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.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol 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 your phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to refuse a petrol nozzle, and add-on devices exist for the rest. Treat it as a backstop, and keep reading the pump.
- Noticing it mid-fill? Stop at once. A weaker mixture follows from less petrol inside your tank, yet your next stage stays the same: don't start the car.
Already put petrol in a diesel around Eastrea?
The order of things is brief, then. Leave it unstarted, with the ignition switched off too. Yet at the forecourt, at BP or anywhere else? Ask the staff to help you roll the vehicle away from the pump. Then call 0333 366 0103 and tell us what went in, roughly how much, and whether it's run.
If it was AdBlue rather than petrol, say so. That's a separate fault — corrosion and deposits rather than lost protection — and it has its own page for Eastrea.
What makes one Eastrea petrol in a diesel job cost more than the next
The four scenarios above are four separate jobs, so no single quote for this would be honest. The situation itself does most of the work of moving your cost. Two things follow that: the petrol that went in as a share of what that tank holds, then the spot your car is in and whether a van can get to it safely.
That's why we ask three queries before quoting instead of after: what was put in, how much, and whether it has run. Those answers are what turn a range into one firm number.
About Eastrea and where it is
Eastrea is a small village in Cambridgeshire, situated near the city of Peterborough and surrounded by nearby places such as Coates and Bassenhally Field. Eastrea sits in a low-lying area, with an elevation of around 6 metres, and is characterized by its predominantly detached housing. Eastrea is located approximately 72.5 miles from London, making it a rural community with easy access to larger cities. Eastrea remains a quiet residential area with a population of around 590 people.
Across Cambridgeshire and in Eastrea: fuel drain cover
Petrol in diesel jobs in Eastrea — part of the PE postcode area — go to vans that likewise cover the spots round it, Coates, Bassenhally Field and Oldeamere among them. The car does not need to come to us: our engineers drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
Still at the petrol pump in Eastrea?
Nothing beats it: that's where you are. Ring, and keep it switched off.