How Worried Should You Be? Petrol in a Diesel Car in Towcester
Not started? Then less worried than you probably are. Petrol resting in a diesel tank does nothing to the engine until something pulls it through the system — the ignition priming the pump, your starter, or the drive itself. So the truthful answer to the first query everyone in Towcester asks, "have I ruined it?", is generally no. Keep it that way: leave your motor off and call Petrol in Diesel. The remainder of this page explains what petrol really does to a diesel, how to judge how far it has got, and how to make sure it does not happen to you again.
What petrol in a diesel does to the engine
Diesel does two tasks on its way through an engine. It ignites, and before it combusts it lubricates. Extremely fine clearances go into your injectors and the high-pressure pump, and only your diesel flowing through keeps those surfaces from grinding together.
Of those two jobs, petrol handles the first poorly and the second never. The clattering comes from petrol being designed not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips away the lubrication the system depends on, and any pump running on that blend is wearing itself.
Seen together, they make clear the shape the issue has. Contact doesn't do the harm — circulation does. All a tank with petrol in it amounts to is a fuel fault. Whatever a worn pump sheds travels on, borne by your fuel, into the fuel injectors further along, which is why a pump that has worked on that petrol is where a mechanical issue starts.
Petrol in a diesel in Towcester: how bad is it? Four cases
Fuelled, and not started: nothing beats it. Just the tank has petrol in it, so the task is draining the tank and cleaning the fuel system where the car sits. This situation can only really happen on a forecourt: anywhere else, your car got there by being driven.
Started for a moment, or just the ignition on. Once primed, the fuel system has pulled petrol out of that tank as far as the filter and your lines. Still usually simple: drain, flush, and your filter seen to.
Your pump now worked a few miles on weakened fuel — that is what driving the car does. Distance is only half of that; how hard it was driven counts just as much. Either way the work includes your tank, the fuel lines, the filter and clean fuel through the whole circuit. Short trips, such as the school run to Towcester Church of England Primary School, are one matter. A run as far as Milton Keynes, under 15 miles away, is a very different job. So is any miles on the M1, under 10 miles from Towcester, where your engine has been labouring hard the whole time.
It complained, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone ragged. That is the motor telling you its fuel no longer is behaving like diesel. Stop where you are — on the verge on Chantry Lane, at the kerb, down a side road — and don't move it. What goes first is still the fuel drain and flush-through, and that sorts it out, with lasting damage very rare when a car is stopped soon.
Towcester people 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'll be." A fuller tank of the same mix is all it gives, because topping up removes nothing. That advice assumes a diesel fuel system tolerates petrol by percentage. It does not.
Not so: a newer diesel copes with a bit of petrol. If anything, the reverse. Finer components and higher pressure are the way a current diesel runs its fuel, and that makes the lubrication count more, not less.
This is the one that catches people. Myth: "If it starts and drives, there is no harm done." Any petrol motor fed diesel normally will not run, and so the driver stops and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile the pump grinds. Running isn't the same as fine.
An outdated fix for a separate fault lies behind this one. Myth: "Add some two-stroke oil and drive it home." The petrol is still in your tank after that, and what it has thinned is not put back.
Myth: "Drain that tank yourself and you are sorted." Once the engine has been run, some of the petrol is no longer in your tank: it's in the filter and the fuel lines, and it goes straight back through your pump on your next start. Clearing petrol into a can at the kerbside is also truly risky.
How does petrol in a diesel occur?
On purpose? Never. Through carelessness? Seldom, if ever. One way only, since of the nozzles: the smaller petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one generally will not fit a petrol vehicle. That's how the forecourt makes it easy.
The moment routine stops matching the car is the moment it takes place. A car that is new to you — a hire car, on loan as a courtesy car, or just bought. Two vehicles on one driveway, one petrol, one diesel. Your ordinary forecourt, its pumps now in a different order. A rushed fill en route to Northampton with a train to catch. A new-to-you diesel Renault Megane, its first fuelling, and a motorist accustomed to petrol: precisely when it takes place. Your hand does what it has always done when you add rain, a phone call or a back seat full of kids.
How to avoid petrol in a diesel on your next fill-up around Towcester
- Not every forecourt in the UK follows green for unleaded and black for diesel, even if most usually do. Check the petrol pump's label; the colour is just a clue.
- Inspect your filler flap. Plenty of cars state the fuel type inside the flap or on the cap. Look at it on the first fill in a motor you don't know.
- One of each in the house? Label the key to your diesel — a bright fob, a sticker — since meaning to remember is not enough.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump. It sounds silly and it works.
- Mistakes like this are easy to make while your mind is on something else, so the phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to block a petrol nozzle, and add-on devices exist for motors without one. They are a backstop, not a reason to stop checking the pump.
- The moment you realise, stop: less petrol inside your tank makes a weaker blend. What to do next doesn't change, though — still don't crank it.
Put petrol in a diesel in Towcester already?
Then the order of things is short. Leave it unstarted, with your ignition off as well. The staff at the forecourt — whether at Shell itself or wherever you filled up — will usually help push it clear of the pump if you ask. What went in, about how much, and if it has run: tell us that when you call 0333 366 0103.
Corrosion and deposits are the trouble with AdBlue, where petrol means lost lubrication. So if it was AdBlue, say so — and read its own Towcester page.
One petrol in a diesel job in Towcester costs more than another. Why?
A fair single price does not exist here: four situations, four separate tasks. What shifts the cost is chiefly which of them you are in. Two things come after that: the petrol that got in as a share of what that tank takes, then the place your car is in and whether a technician can reach it safely.
Ahead of any quote, not after, we ask three questions: the fuel that got in, its quantity, and whether it has run. That's why. The replies turn a range into a straight figure.
About Towcester itself
Towcester is a town in southern Northamptonshire, situated on the River Tove at an elevation of around 93 metres. Towcester lies near several smaller villages, including Wood Burcote, Hulcote, and Heathencote, and is approximately 11.7 miles from Milton Keynes. Towcester has a population of around 10655 people, predominantly living in detached housing. Towcester is also within commuting distance of London, being around 56.7 miles from the capital.
Across Northamptonshire and around Towcester: fuel drain cover
Our vans answering petrol in diesel jobs around Towcester, in the NN postcode area, equally work the locations around it, Wood Burcote, Hulcote and Heathencote among them. The car does not need to move to us: our technicians drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
In Towcester and still at the petrol pump?
The best place there is, then — that is where you are. Switched off it remains; then ring.