Petrol in a Diesel Car in Winthorpe: How Worried Should You Be?
Probably less than you are now — as long as nobody has started it. Everyone in Winthorpe begins with "have I wrecked it?", and the fair answer is usually no: petrol left inside the tank of a diesel remains harmless till priming, cranking or driving draws it into your fuel system. Petrol in Diesel is who to phone, with the motor kept off, so it stays that way. Further down, this page sets out what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you a second time.
Petrol in a diesel: what does it do to the motor?
On its way through a motor, diesel does two tasks. It burns, and before it ignites it lubricates. Extremely fine tolerances go into the injectors and the high-pressure fuel pump, and only your diesel flowing through stops those surfaces grinding together.
Petrol does the first task badly and the second not at all. Being less viscous than diesel, petrol strips out the protection a fuel system needs, leaving a pump running on the mixture to wear itself. It is also made to resist igniting under compression — the reverse of what a diesel needs — which is why you get the rattling.
The shape of the problem is clear once you put those together. The damage is done by movement, not by contact. Petrol in the tank is a fuel problem. Once the pump has been labouring on that petrol, a mechanical problem has begun: whatever is shed by a pump that's wearing down is carried downstream to the fuel injectors with your fuel.
Four situations we see in Winthorpe: how bad is petrol in a diesel?
Filled up, and not started: nothing beats it. That petrol is inside the tank and just that tank, and the job is a drain and a flush where the vehicle sits. This is the one situation that can only truly take place at a forecourt, since anywhere else the car has been driven to get there.
Ignition on, or started for a moment. The system has been primed, so petrol has left your tank and got to your filter and the fuel lines. Drain, flush, see to your filter: still usually straightforward.
The pump now worked a couple of miles on thinned fuel — that's what driving the car does. Tank, lines, filter, then fresh fuel run through the whole circuit: that is this work, and the way the car was driven counts as much as the miles. Driving the children to Seathorne Primary Academy is one sort of trip. Any mileage on the M180, under 50 miles from Winthorpe, means the engine has worked hard throughout, and a run to Lincoln, under 50 miles away, makes a very different job as well.
Knocking, a lumpy idle, smoke, a throttle gone soft: driven until it complained. The fuel isn't behaving like diesel any more, and the motor is telling you. Leave it wherever it stops: a lay-by, a side street, the verge on Martin Way. What goes first is still the drain and flush, and that takes care of it, with permanent damage very rare when a car is stopped quickly.
Petrol in a diesel stories Winthorpe drivers hear
"Top it up the rest of the way with diesel and it will be fine" — a myth. It will not. Topping up takes out nothing; it gives you a bigger tank of the same mix. Percentage isn't how a diesel fuel system copes with petrol, however much that advice assumes.
Myth: a current diesel copes with a bit of petrol. If anything, the reverse. Lubrication matters more on current diesels, not less, because their fuel passes through smaller parts at higher pressure.
"It starts, it drives, so there is no harm" — the myth that trips up most motorists than any other. Any petrol motor fed diesel usually won't run, so the driver stops and the harm stops with them. Whilst your pump wears, a diesel fed petrol usually starts, ticks over and drives away as though nothing has happened. Running does not mean fine.
Not so: a two-stroke additive makes it safe to drive home. It was an old workaround, supposed for another issue. It does not put back what petrol has thinned, and the petrol is still inside the tank later.
"Drain it yourself and you are sorted" — a myth, since after it has been running some petrol lies in your filter and lines, waiting to go straight back through your pump on the next start. Also, a can of petrol drained at the kerbside is truly dangerous.
How does petrol in a diesel occur?
Carelessness is seldom the cause, and no one means to do it. 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 motor at all. The forecourt makes it easy, and the error runs one way.
The moment habit stops matching the car is the moment it happens. Courtesy car, hire car, or a car that's new. Two vehicles on one drive, one petrol, one diesel. A forecourt you know, but with its pumps laid out differently. Rushing for a train at Skegness and fuelling up en route. Years of petrol motors behind you, a diesel Volkswagen Passat in front of you at the forecourt for its first tank — that's when. Throw in rain, a phone call or a back seat full of children, and your hand does what it has always done.
Avoiding petrol in a diesel next time you fill up in Winthorpe
- Green for unleaded and black for diesel is normal in the UK — but not on each forecourt. Trust the label on the pump, not the colour.
- In a vehicle you do not know, look inside the flap over the filler or at the cap before the first fill: many motors state the fuel type there.
- A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, for a home with one of each.
- It sounds daft and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump.
- While you're thinking about something else, this is an easy mistake to make — so put your phone away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to refuse a petrol nozzle, and aftermarket devices exist for the rest. Treat it as a safety net, and keep reading the pump.
- The moment you realise, stop: less petrol inside your tank makes a thinner blend. What to do next does not change, though — still do not start the car.
Petrol already in a diesel around Winthorpe? Begin here
In that case, there is just a short order of things. Starting it is out, and so is switching on your ignition. If you're still at the forecourt — Valero or anywhere else — ask the attendants to help you roll it away from the pump. Then ring 0333 366 0103 and tell us what went in, roughly how much, and whether it's run.
Say so if it was AdBlue rather than petrol: it's a different problem, with its own page for Winthorpe, since AdBlue brings corrosion and deposits rather than lost protection.
One petrol in a diesel job in Winthorpe costs more than another. Why?
There's no fair single quote for this, because the four scenarios above are four separate tasks. Which of them you're in is mostly what shifts the cost. Where your car is matters too, and whether a van can safely reach it, after the ratio of petrol to what your tank takes.
That's why our technicians ask three questions before pricing rather than after: what went in, how much, and if it has run. Their answers are what change a range into one firm number.
About Winthorpe, for a moment
Winthorpe is a small suburban area located on the coast of Lincolnshire, with an elevation of approximately 3 metres above sea level. Winthorpe sits near the popular seaside resorts of Skegness and Ingoldmells, and is close to the village of Seathorne. Winthorpe has a population of around 2526 people, predominantly living in semi-detached housing. Winthorpe is situated about 36.6 miles east of Lincoln and 116.1 miles north-east of London.
Fuel drain cover across Lincolnshire, Winthorpe included
Our teams answering petrol in diesel calls around Winthorpe, in the PE postcode area, also work the spots around it, Seathorne, Skegness and Ingoldmells among them. You need not bring your car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots where we work.
Still at the petrol pump around Winthorpe?
Nothing beats it: that's where you now are. Turned off it remains; then call.