Petrol in a Diesel Car in Houghall: How Worried Should You Be?
Far less than you probably are, provided it hasn't been started. Petrol resting in a diesel tank does nothing to the motor until something pulls it through your fuel system — your ignition priming your pump, your starter, or driving itself. So the truthful answer to the first query everyone around Houghall asks, "have I ruined it?", is usually no. Petrol in Diesel is who to call, with the engine left off, and so it remains that way. Below, you will find what petrol actually does inside a diesel, how far it may have gone, and how to stop it happening to you a second time.
Inside your engine: what petrol in a diesel really does
Diesel has two tasks on its way through an engine. It lubricates to begin with, and only then does it burn. Built to very fine tolerances, the fuel injectors and your pump rely on your diesel flowing through them to keep their surfaces from wearing against one another.
Badly at the first, not at all at the second: that's petrol. It's runnier than diesel and strips away the lubrication the system depends on, so a pump running on a petrol mixture 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 rattling comes from.
Put those together and the shape of the trouble is clear. Not contact but circulation is what does the damage. Where that petrol is only inside that tank, it is a fault of fuel, nothing more. After your pump has been working on that petrol, a mechanical fault has started: whatever is shed by a pump that is grinding is carried onward to the fuel injectors with your fuel.
How bad is petrol in a diesel? Four scenarios our technicians see in Houghall
Filled up, and not started: nothing beats it. Being on a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With the petrol held inside that tank alone, it's cleared and purged right where it stands, and nothing more is needed.
Ignition on, or started for a second. With your system primed, the fuel lines and filter already contain petrol that has come from your tank. Normally little more than clearing, purging and sorting the fuel filter, so still simple.
Driven a couple of miles. Now the pump has spent these miles working on weakened fuel. The work is your tank, the lines, the filter and clean fuel through the entire system, and how hard the vehicle was driven counts as much as how far. On the school run to St Oswald's Church of England Aided Primary and Nursery School, the mileage is small. Driving as far as Durham, under 3 miles away, makes a very different task — as does any miles on the A1(M), under 3 miles from Houghall, with the motor labouring hard all the way.
Knocking, an uneven idle, smoke, a throttle gone soft: driven until it complained. The engine is telling you your fuel is no longer behaving like diesel. Pull up wherever you are — the verge on Hollingside Lane, a lay-by, a side street — then leave the car there. Long-term damage is very unusual when a car is stopped soon, and the fuel drain and flush that still come first take care of it.
What Houghall people get told about petrol in a diesel — and the myths in it
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing comes out when you top up — your tank just carries more of the same blend. Percentage isn't how a diesel fuel system copes with petrol, whatever that advice supposes.
Myth: a current diesel copes with a bit of petrol. If anything, the opposite. Lubrication matters more on newer diesels, not less, because their fuel runs through finer parts at higher pressure.
The myth that catches people off guard: if it starts and drives, it must be unharmed. Diesel in a petrol motor generally leaves a motor that won't run: the motorist stops, and so does the harm. A diesel fed petrol generally starts, ticks over and drives away as if nothing has happened, whilst the pump wears. Fine and running aren't the same at all.
Myth: "Add some two-stroke oil and drive it home." It is an old fix for a different fault. That petrol is still in the tank after that, and what it has thinned isn't put back.
"Drain it yourself and you are sorted" — a myth, since after it has been running some petrol sits in the filter and lines, ready to go straight back through the pump on your next start. It's also truly risky to drain petrol into a can at the kerbside.
Petrol in a diesel: how does it occur?
On purpose? Never. Through carelessness? Seldom, if ever. The forecourt makes it easy: the petrol nozzle is the smaller of the two, and it slides into a diesel filler with almost no resistance, while a diesel nozzle generally will not go into a petrol vehicle at all. So the slip runs one way.
It happens when routine and your car stop matching. A new car, a hire car or a courtesy car. One petrol and one diesel on the driveway of the same household. The pumps in a different order on a well-known forecourt. Fuelling up in a hurry on the way to Durham, with a train to catch. Precisely the moment it occurs: after years of driving petrol, someone fills a diesel Volkswagen Passat for the first time. Your hand repeats what it has always done when you add rain, a phone call or a back seat full of kids.
Next time you fill up in Houghall: preventing petrol in a diesel
- Check the pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on each forecourt. The label is what matters.
- Plenty of motors state the fuel inside the filler flap or on the cap, so check there on the first fill in a vehicle you do not know.
- Good intentions count for less than a sticker or a fob in a bright colour on your diesel's key if a home has one of each. So label it.
- Say it before you lift it. On your 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.
- Whilst you are thinking about something else, this is an easy mistake to make — so put the phone away.
- Add-on devices exist for cars without one, and some diesels are built with a filler that will not take a petrol nozzle. Helpful — but a backstop at best, never a reason to stop checking the label.
- The moment you realise, stop: less petrol inside that tank means a thinner blend. What to do next does not change, though — still don't crank it.
Already put petrol in a diesel around Houghall?
Then the order of things is short. Do not start the vehicle, and do not turn your ignition on. Ask the attendants to help you push it away from the pump if you are still at the forecourt, whether that's Shell or anywhere else. Next, 0333 366 0103. We will ask what was put in, about how much, and if it has been run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a separate fault — Houghall has a page all for it.
Houghall petrol in a diesel tasks: why one costs more than another
An honest single quote doesn't exist here: four situations, four separate jobs. Which of them you're in is chiefly what shifts the cost. Where your car is matters too, and whether our van can safely get to it, after the share of petrol to what your tank takes.
Before any quote, not after, come three queries: your fuel that was put in, its quantity, and whether it has run. That is why. Those replies are what change a range into one firm number.
About Houghall
Houghall is a small hamlet situated on the riverside in County Durham, near the city of Durham. Houghall sits at an elevation of 38 metres, close to the nearby places of Shincliffe, High Shincliffe, and Elvet Hill. Houghall is characterized by its predominantly detached housing stock, reflecting its residential nature. Houghall is located approximately 1.6 miles from Durham city centre, making it a commuter-friendly location.
Fuel drain cover across Durham, Houghall included
Our vans answering petrol in diesel jobs in Houghall, in the DH postcode area, equally work the locations around it, Shincliffe, High Shincliffe and Elvet Hill among them. The vehicle doesn't need to come to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
In Houghall and still at the pump?
Nothing beats it: that is where you now are. Call, and leave it turned off.