Petrol in a Diesel Car in Mengham: How Worried Should You Be?
Less than you probably are, if it has not been started. Until your ignition primes your pump, the starter turns, or the vehicle is driven, petrol in a diesel tank just sits there and does nothing. Which means the truthful reply to that first Mengham query — "have I wrecked it?" — usually no. Keep it like that: leave your motor off then call Petrol in Diesel. What petrol actually does to a diesel, how to judge how far it's gone, and how to keep it from happening again: that's the rest of this page.
Petrol in a diesel: what does it do to your engine?
Passing through an engine, diesel is doing two things at the same time. Before it ignites, it lubricates — then it burns. The high-pressure fuel pump and your injectors are designed to extremely fine clearances, and the diesel passing through them is what stops those surfaces from wearing against one another.
Petrol does the first job poorly and the second not at all. The knocking comes from petrol being made not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips out the lubrication your system hinges on, and any pump running on that blend is wearing itself.
Together, those make the shape of the trouble plain. It's movement that does the damage, not contact. A tank with petrol in it is a fuel problem. The start of a mechanical problem is a pump that has been working on that petrol — and whatever a worn pump sheds moves on with your fuel to the fuel injectors beyond it.
Petrol in a diesel around Mengham: how bad is it? Four situations
Filled up, never started. The best case there is. Being on a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With that petrol kept inside the tank alone, it's emptied and flushed right where it stands, and nothing more is needed.
Ignition on, or started for a second. With the system primed, your lines and filter already hold petrol that came from that tank. That is normally still a simple task — a drain, a flush, and the fuel filter seen to.
Your pump has worked a few miles on diluted fuel — that's what driving the car does. How hard your car was driven matters as much as how far, and this work takes in your tank, the fuel lines, the filter and fresh fuel through the entire circuit. Short trips, such as the school run to Mengham Junior School, are one matter. Any miles on the Waterlooville Bypass, under 5 miles from Mengham, means the motor has worked hard throughout, and a run to Portsmouth, under 10 miles away, is a very different job as well.
Driven on until it protested — rattling, smoke, a ragged idle, a soft throttle. That is the engine telling you its fuel no longer is behaving like diesel. Stop where you are — on the verge on Osprey Drive, at the kerb, down a side road — and do not move it again. A car stopped early very seldom has permanent damage, because the fuel drain and the flush, which still go first, sort it out.
Mengham drivers and the petrol in a diesel myths they hear
Myth: topping up to full with diesel makes it fine. It does not. A bigger tank of the same mixture is all it gives, since topping up removes nothing. The assumption behind that guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
"Modern diesels can handle a little petrol" — a myth, and closer to the opposite. At higher pressure, through smaller components: that's how a newer diesel moves its fuel, so the protection counts more, not less.
The myth that catches drivers off guard: if it starts and drives, it must be unharmed. A petrol engine fed diesel normally won't run, and so the driver stops and the damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile your pump grinds. Being able to run is not proof of being fine.
Not so: a two-stroke additive makes it safe to drive home. It is an old fix, supposed for another fault. It doesn't put back what petrol has weakened, and that petrol is still in your tank after that.
"Drain it yourself and you are sorted" — a myth, since after it's been running some petrol sits in the filter and lines, ready to go straight back through your pump on the next start. It is also genuinely dangerous to drain petrol into a can by the roadside.
How does petrol in a diesel take place?
It is seldom carelessness, and nobody does it on purpose. A diesel nozzle generally 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 mistake simple, and just in one direction.
Routine and the car falling out of step is how it takes place. Hire cars, courtesy cars, and cars that are new to you. Two cars on one driveway, one petrol, one diesel. A forecourt you know, only with its pumps laid out differently. A train to catch, and a hurried fill en route to Fratton. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it occurs. With rain, a call arriving, or children to deal with, your hand just does what it always has.
Preventing petrol in a diesel next time you fill up in Mengham
- A green handle for unleaded and black for diesel is usual in the UK — yet not on every forecourt. Go by the label on the pump, not the colour.
- Check your filler flap. Plenty of cars state the fuel inside the flap or on the cap. Look at it on your first fill in a car you do not know.
- 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 mark it.
- Before the nozzle comes off the petrol pump the first time you fuel a hired or new motor, say "diesel" aloud. Silly, yes, but it works.
- Whilst you are thinking about something else, this is an easy mistake to make — so put the phone away.
- Add-on devices are available for cars without one, and some diesels are built with a filler that won't accept a petrol nozzle. Useful — but a backstop only, never a reason to stop checking the label.
- Noticing it halfway? Stop at once. A weaker mixture follows from less petrol in that tank, yet your next step stays the same: do not crank it.
Put petrol in a diesel in Mengham already?
Then the order of things is brief. Starting it is out, and so is switching on your ignition. The staff at the forecourt — whether at JET itself or wherever you filled up — will usually help push it clear of the petrol pump if you ask. What got in, about how much, and whether it's run: tell us those when you phone 0333 366 0103.
If it was AdBlue instead of petrol, say so. That's a different problem — corrosion and deposits rather than lost lubrication — and it has its own page for Mengham.
One petrol in a diesel job in Mengham costs more than another. Why?
There's no honest single price for this, because the four scenarios above are four different tasks. Mostly, the cost moves with which situation you are in. The ratio counts next, meaning how much of your tank is petrol, and then the position of the vehicle and whether reaching it is safe for our van.
Three queries come first, before quoting, rather than after — what got in, how much, has it run — and this is the reason. With those replies, there is a straight figure rather than a range.
About Mengham
Mengham is a coastal suburban area in Hampshire, situated near the city of Portsmouth and close to the neighbouring communities of South Hayling, Sea View, and Eastoke. Mengham lies at a low elevation of around 5 metres, reflecting its seaside location. Mengham has a population of approximately 4412 people, living in predominantly detached housing. Mengham is also within commuting distance of London, being around 61.8 miles away.
Mengham and Hampshire: where our fuel drain cover runs
Petrol in diesel calls in Mengham — part of the PO postcode area — go to teams that also cover the locations around it, South Hayling, Sea View and Eastoke included. You need not bring your car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all locations we drain.
Mengham: still at the pump?
Then you are in the best spot there can be. Keep it off. Phone.