Newton-with-Scales: Petrol in a Diesel Car? How Worried to Be
Unstarted? Then less worried than you likely feel. Until the ignition primes the pump, the starter turns, or the vehicle is driven, petrol in a diesel tank just waits there and does nothing. Which makes the truthful reply to that first Newton-with-Scales query — "have I ruined it?" — normally no. Keep it that way: leave the engine off then call Petrol in Diesel. Further down, this page sets out what petrol actually does inside a diesel, how far it may have gone, and how to stop it happening to you again.
The motor and petrol in a diesel: what goes on
Two jobs fall to diesel on its route round a motor. It lubricates first, and after that does it burn. Extremely fine tolerances are built into your injectors and the high-pressure pump, and only your diesel running through keeps their surfaces from grinding together.
The second job petrol does not do at all, and the first it does poorly. It is runnier than diesel and strips away 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 opposite of what a diesel needs from its fuel. That's where the knocking comes from.
Combined, those leave the shape of the trouble plain. Contact does not do the damage — movement does. Petrol in the tank is a fuel problem. Once the pump has been labouring on that petrol, a mechanical fault has begun: whatever is shed by a pump that is grinding is carried downstream to the fuel injectors with your fuel.
Petrol in a diesel around Newton-with-Scales: how serious is it? Four situations
Filled up, and never started: nothing beats it. Being at a forecourt is what makes this the case: elsewhere, your car has been driven there to begin with. With that petrol held in your tank alone, it is cleared and purged right where it stands, and nothing more is needed.
Started for a second, or just your ignition on. With the fuel system primed, the fuel lines and filter now hold petrol that came from your tank. Usually little more than emptying, cleaning and seeing to the filter, and so still straightforward.
Those few miles on the road were your pump labouring on fuel thinned by petrol the whole way. Distance is only half of it; how hard it was driven counts equally. Either way this work includes your tank, your lines, the filter and clean fuel through the entire circuit. Driving the kids to Newton Bluecoat Church of England Primary School is one sort of trip. Driving as far as Preston, under 10 miles away, makes a very different job — as does any distance on the M55, under 3 miles from Newton-with-Scales, with the engine labouring hard all the way.
Driven on till it complained — clattering, smoke, a ragged idle, a dead throttle. That is your motor telling you its fuel has stopped acting like diesel. Leave it wherever it has stopped: a lay-by, a side street, the verge on Oak Lane. Lasting damage is very rare if a vehicle is stopped early, and the drain and flush that still come first take care of it.
Newton-with-Scales drivers and that petrol in a diesel myths they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing is removed by topping up — you're left with a bigger tank, still the same mixture. Percentage is not how a diesel fuel system copes with petrol, whatever that advice presumes.
"Newer diesels can handle a little petrol" — a myth, and closer to the reverse. Lubrication matters more on newer diesels, not less, because their fuel runs through finer components at higher pressure.
This is the one that fools drivers. Myth: "If it starts and drives, there's no damage done." Diesel in a petrol motor normally leaves a motor that will not run: the motorist stops, and so does the harm. Feed petrol to a diesel and it normally starts, ticks over and drives away as if nothing has happened — all the while its pump is wearing. A running engine does not mean fine.
Not so: a two-stroke additive makes it safe to drive home. It is an old workaround, meant for another problem. The petrol is still in your tank afterwards, and what it has diluted is not put back.
"Drain it yourself and you're sorted" — a myth, since after it has been running some petrol lies in the filter and lines, ready to go right back through the pump on your next start. Emptying petrol into a can at the kerbside is also really dangerous.
Petrol in a diesel: how does it occur?
It's rarely carelessness, and nobody does it on purpose. One way only, since of the nozzles: the narrower petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one generally will not fit a petrol motor. That's how the forecourt makes it straightforward.
It happens when habit and your car stop matching. Hire cars, courtesy cars, and cars that are new to you. A household with one petrol and one diesel on the driveway. Your ordinary forecourt, its pumps suddenly in a different order. Racing for a train outside Salwick and fuelling up en route. Precisely the moment it takes place: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. Add a back seat full of children, a phone call or rain, and the hand takes over.
Avoiding petrol in a diesel next time you fill up around Newton-with-Scales
- Check the pump, not the colour. In the UK unleaded handles are normally green and diesel black, yet not on every forecourt. The label is what matters.
- Check the filler flap. Many vehicles state the fuel inside the flap or on the cap. Look at it on the first fill in any vehicle you don't know.
- One of each in the household? Label the key to your diesel — a coloured fob, a sticker — because intending to remember is not enough.
- Before the nozzle comes off the pump the first time you fill a hired or new car, say "diesel" aloud. Daft, yes, yet it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, so tuck your phone away and keep your mind on the petrol pump.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to block a petrol nozzle, and aftermarket devices exist for the rest. Count it as a backstop, then keep reading the pump.
- As soon as you realise, stop: less petrol inside the tank makes a thinner mixture. What to do next doesn't change, though — still do not fire it up.
Petrol already in a diesel in Newton-with-Scales? Start here
Then the order of things is brief. Leave it unstarted, with your ignition off too. The staff at the forecourt — whether at Texaco itself or wherever you filled up — will normally help push it away from the petrol pump if you ask. Then ring 0333 366 0103 and tell us what went in, roughly how much, and whether it has run.
Corrosion and deposits form the issue with AdBlue, where petrol means lost lubrication. So if it was AdBlue, say so — and see its own Newton-with-Scales page.
Why one petrol in a diesel job around Newton-with-Scales costs more than another
There's no fair single quote for this, since the four scenarios above are four separate jobs. Mostly, the cost moves with which situation you're in. The share matters next, meaning how much of the tank is petrol, and then the position of your car and whether getting to it is safe for a van.
That's why our technicians ask three questions before pricing instead of after: what got in, how much, and whether it has run. The replies turn a range into a straight figure.
About Newton-with-Scales and where it is
Newton-with-Scales is a village in Lancashire, situated inland at an elevation of 18 metres, approximately 5.8 miles from Preston. Newton-with-Scales has a population of around 845 people, with predominantly detached housing. Newton-with-Scales is located near other small places, including Newton, Dowbridge, and Clifton, in the North West region of England.
Fuel drain cover in Newton-with-Scales and across Lancashire
Newton-with-Scales rests in the PR postcode area, and the teams that answer petrol in diesel jobs there work the locations around it as well — Newton, Dowbridge and Clifton among them. You need not move your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations we drain.
Newton-with-Scales: still at the petrol pump?
The best position there is, then — that is where you are. Keep it turned off, and ring.