Should You Worry? Petrol in a Diesel Car in Old Saltburn
Likely less than you are now — as long as nobody has started the vehicle. Petrol sitting in a diesel tank does nothing to the motor until something draws it through your fuel system — your ignition priming the pump, your starter, or the drive on its own. So the fair answer to the first question anyone in Old Saltburn asks, "have I wrecked it?", is generally no. Petrol in Diesel is who to ring, with the engine kept off, so it stays that way. Further down, this page sets out what petrol really does inside a diesel, how far it may have gone, and how to stop it happening to you a second time.
Your engine and petrol in a diesel: what goes on
Diesel does two jobs on its way through an engine. Before it burns, it protects — and then it combusts. Made to extremely fine gaps, your injectors and your pump rely on the diesel moving through them to stop their surfaces wearing against one another.
Badly at the first, not at all at the second: that's petrol. The knocking comes from petrol being designed not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the protection the system hinges on, and any pump working on that mix is wearing itself.
Seen together, they make clear what shape the issue has. It's circulation that does the harm, not contact. Where that petrol is only inside the tank, it is a problem of fuel, nothing more. The start of a mechanical problem is a pump that has been labouring on that petrol — and whatever a worn pump sheds travels on with the fuel to the injectors downstream.
Four situations our engineers see around Old Saltburn: how bad is petrol in a diesel?
The best case there is: filled up, never started. The petrol is inside your tank and just the tank, and the job is a drain and a flush where the car stands. This is the one situation that can only really happen on a forecourt, because anywhere else the car has been driven to get there.
A moment's running, or merely your ignition on. Your system has been bled, and so petrol has left your tank and reached the filter and your lines. That's usually still a straightforward task — a drain, a flush, and the fuel filter dealt with.
Some miles driven, and the pump has spent every one of them working on diluted fuel. The work is that tank, your lines, your filter and clean fuel through the whole system, and how hard the car was driven matters as much as how far. A school run to Saltburn Primary School is one matter. A run as far as Sunderland, under 50 miles away, is a very different job. So is any mileage on the A1(M), under 25 miles from Old Saltburn, where the motor has been labouring hard the whole time.
Driven till it protested. Clattering, a ragged idle, smoke, a throttle that has gone soft. That is your motor telling you its fuel has stopped acting like diesel. Whether it is the verge on Saltburn Bank, a lay-by or a side road, stop where you are and leave it. Lasting damage is very rare if a car is stopped quickly, and the drain and flush-through that still go first deal with it.
What Old Saltburn drivers get told about petrol in a diesel — and the myths in it
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. A fuller tank of the same mix is all you get, because topping up removes nothing. The idea behind the advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: a newer diesel copes with a bit of petrol. If anything, the opposite. A modern diesel runs its fuel through more precise parts at higher pressure, which makes the protection matter more, not less.
This is the one that fools people. Myth: "If it starts and drives, there is no damage done." Feed diesel to a petrol engine and it generally will not run, and so the motorist stops — and the harm stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump grinds. A running engine does not mean fine.
An old fix for a separate problem lies behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." None of what petrol diluted gets put back by it — and later, that tank still holds that petrol.
The next start sends petrol back round the pump from the lines and the fuel filter, where some of that sits once your engine has run. That's why draining the tank yourself does not sort it — a myth. Emptying petrol into a can at the kerbside is also really risky.
Why petrol in a diesel takes place so easily
On purpose? Never. Through carelessness? Seldom, if ever. The petrol nozzle is the smaller of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol car at all. The forecourt makes it easy, and the error runs one way.
It occurs when routine and the vehicle stop matching. A new motor, a hire car or a courtesy car. A household with one petrol and one diesel on the drive. A forecourt you know, only with its pumps laid out differently. A hurried fill on the way to Saltburn with a train to catch. A new-to-you diesel Renault Clio, its first fuelling, and a motorist used to petrol: exactly when it happens. Your hand repeats what it has always done once you add rain, a phone call or a back seat full of children.
Next time you fill up in Old Saltburn: avoiding petrol in a diesel
- Read the petrol pump, not the colour. In the UK unleaded handles are normally green and diesel black, yet not on each forecourt. The label is what counts.
- In a motor you do not know, look inside the flap over your filler or at the cap before the first fill: many motors print the fuel type there.
- A coloured fob or a sticker on your diesel's key does more than any amount of intending to remember, in a household with one of each.
- It seems daft and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump.
- Mistakes like this are simple to make whilst your mind is on something else, and so your phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler built to reject a petrol nozzle, and add-on devices are available for vehicles without one. They are a safety net, not a reason to stop reading the petrol pump.
- Noticing it mid-fill? Stop there and then. A thinner mix results from less petrol inside that tank, yet the next stage remains the same: do not start the car.
Put petrol in a diesel in Old Saltburn already?
Then, there is just a short order of things. Starting it is out, and so is switching on the ignition. Ask the attendants to help you push it clear of the petrol pump if you're still on the forecourt, whether that's BP Saltburn or anywhere else. What got in, roughly how much, and whether it has run: tell us that when you call 0333 366 0103.
Say so if it was AdBlue instead of petrol: it's a separate fault, with its own page for Old Saltburn, because AdBlue brings corrosion and deposits rather than lost lubrication.
What makes one Old Saltburn petrol in a diesel job cost more than the next
A fair single quote doesn't exist here: four scenarios, four separate jobs. Which of them you're in is chiefly what moves the cost. Two things follow that: the petrol that went in as a proportion of what the tank holds, then the place the car is in and whether our van can reach it safely.
That's why our technicians ask three questions before costing rather than after: what got in, how much, and whether it has run. With those answers, you get a straight figure rather than a range.
About Old Saltburn itself
Old Saltburn is a small suburban area situated on the coast of North Yorkshire, with a low elevation of around 4 metres above sea level. Old Saltburn lies near the larger town of Saltburn-by-the-Sea and is close to other nearby places such as New Brotton and New Skelton. Old Saltburn has a population of approximately 2191 residents, who mostly live in terraced housing. Old Saltburn is located about 27.5 miles from the city of Sunderland and around 215.5 miles from London.
Old Saltburn and North Yorkshire: where our fuel drain cover runs
The teams answering petrol in diesel calls in Old Saltburn, in the TS postcode area, also work the locations near it, Saltburn-by-the-Sea, New Brotton and New Skelton included. No need to bring your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots we drain.
At the pump in Old Saltburn, right now?
The best spot there is, then — that's where you are. Leave it turned off, then ring.