Croft: Petrol in a Diesel Car? How Worried to Be
If it has not been started, worry far less than you likely are. "Have I wrecked it?" is the first question anyone around Croft asks, and the honest answer is normally no, because petrol resting in a diesel tank hurts nothing until it's dragged through your fuel system — by ignition priming, by the starter, or by being driven. Petrol in Diesel is who to ring, with the motor kept off, so it remains that way. Read on for three things: the effect petrol has inside a diesel motor, the signs of how far it has spread, and ways to make sure you never repeat it.
Petrol in a diesel: what does it do to the motor?
Two tasks fall to diesel on its journey round a motor. Oiling comes before burning; it does both. The high-pressure pump and the injectors are made to very fine gaps, and your diesel passing through them is what stops those surfaces from wearing down against each other.
Badly at the first, not at all at the second: that is petrol. Being less viscous than diesel, petrol strips away the lubrication a fuel system needs, leaving a pump on that mixture wearing itself. It is equally made to resist igniting under compression — the reverse of what a diesel needs — which is why you get the rattling.
Taken together, they show what shape the trouble has. The damage is done by circulation, not by contact. All a tank with petrol in it amounts to is a fuel issue. Once your pump has been working on that petrol, a mechanical issue has begun: anything shed by a pump that is wearing is carried downstream to your injectors with your fuel.
Petrol in a diesel in Croft: how bad is it? Four cases
Fuelled up, not once started. The best case there can be. On a forecourt, and truly only there, the petrol is still confined to the tank — because everywhere else the vehicle was driven to get to it. The job is emptying and purging on the spot.
Started for a second, or only your ignition on. Once primed, the fuel system has pulled petrol from your tank as far as your filter and the lines. Drain, flush, deal with the filter: still usually simple.
Your pump has spent a few miles on thinned fuel — that is what driving the vehicle does. The work is the tank, the lines, the filter and clean fuel through the whole circuit, and how hard the car was driven counts as much as how far. Short trips, like the school run to Croft Church of England Primary School, are one matter. Very different a second time: a run to Leicester, under 10 miles away, or some miles on the M69, under 3 miles from Croft, where the engine kept working hard.
Rattling, an uneven idle, smoke, a throttle gone soft: driven till it complained. The fuel isn't behaving like diesel any more, and your motor is telling you. Stop where you are — on the verge on Broughton Road, at the kerb, down a side road — and do not move it again. Long-term damage is very uncommon if a car is stopped soon, and the drain and flush that still go first deal with it.
Croft drivers and that petrol in a diesel stories they hear
False: topping up to full with diesel makes it fine. It does not. A fuller tank of the same mixture is all it gives, since topping up removes nothing. The assumption behind that advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: "A current diesel can cope with a bit of petrol." If anything, the reverse. More precise components and higher pressure are how a newer diesel runs its fuel, and that makes the lubrication matter more, not less.
Myth: "If it starts and drives, there is no damage done." This is the one that fools people. Diesel in a petrol motor generally leaves a motor that won't run: the driver stops, and so does the damage. While your pump wears, a diesel fed petrol normally starts, idles and drives away as if nothing has happened. Running is not the same as fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an outdated workaround for a distinct fault. None of what petrol diluted is put back by it — and afterwards, your tank still holds that petrol.
The next start draws petrol back round your pump out of the fuel lines and the fuel filter, where some of that sits once the engine has run. That's why a DIY tank drain doesn't leave you sorted — a myth. And, a can of petrol drained at the roadside is truly dangerous.
Petrol in a diesel: how does it take place?
No one does it on purpose, and it is seldom carelessness. A diesel nozzle mostly won't fit a petrol motor, but the slimmer petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error easy, and just in that direction.
The moment habit stops matching the vehicle is the moment it happens. Courtesy car, hire car, or a vehicle that's new. Two vehicles on one driveway, one petrol, one diesel. A forecourt you know, only with its pumps arranged differently. Rushing for a train at Narborough and filling up en route. The first fill-up in a diesel Volkswagen Passat after years of driving petrol is precisely the moment it happens. With rain, a call arriving, or children to deal with, the hand just does what it has always done.
Croft motorists: how to avoid petrol in a diesel next time
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most generally do. Check the petrol pump's label; the colour is just a hint.
- The first fill in a strange motor is the time to check your filler flap — inside it, or on the cap, many vehicles state the fuel to use.
- Good intentions count for less than a sticker or a fob in a vivid colour on the diesel's key if a house has one of each. So label it.
- "Diesel", aloud, before you pick up the nozzle — every time a new or hired car needs its first tank. It seems silly. It does the trick.
- Whilst you are thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to block a petrol nozzle, and add-on devices exist for the remainder. Count it as a backstop, then keep checking the petrol pump.
- The moment you realise, stop: less petrol in your tank means a thinner mix. What to do next doesn't change, though — still do not crank it.
Petrol already in a diesel in Croft? Start here
Short and simple, then, is the order of things. Never fire it up, and don't switch your ignition on. Ask the staff to help you push it clear of the pump if you are still at the forecourt, whether that is Esso or anywhere else. Next, 0333 366 0103. We'll ask what was put in, roughly how much, and if it has been run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a different fault — Croft has a page just for it.
What makes one Croft petrol in a diesel job cost more than the next
A fair single price does not exist here: four scenarios, four separate tasks. What moves your cost is mostly which of them you're in. Two things follow that: the petrol that went in as a share of what that tank holds, then the spot the car is in and whether our van can get to it safely.
That is why our engineers ask three questions before costing rather than after: what went in, how much, and whether it's run. Those replies change a range into a straight figure.
About Croft and where it is
Croft is a village situated on the riverside in Leicestershire, with a relatively low elevation of 77 metres. Croft lies close to the city of Leicester, approximately 7 miles away, and is near other villages such as Potters Marston and Huncote. Croft has a population of around 1466 people and is characterised by predominantly detached housing. Croft is located in the East Midlands region, about 86 miles north of London.
Across Leicestershire and around Croft: fuel drain cover
Croft sits in the LE postcode area, and our vans that answer petrol in diesel jobs there work the spots near it as well — Potters Marston, Huncote and Sutton in the Elms among them. You need not move your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places where we work.
Croft: still at the petrol pump?
Nothing beats it: that's where you now are. Switched off it stays; then call.