Petrol in a Diesel Car in Vernham Dean: How Worried Should You Be?
Not started? Then less anxious than you likely feel. Petrol resting in a diesel tank does nothing to your motor till something pulls it through your fuel system — your ignition priming the pump, your starter, or driving on its own. So the fair answer to the first question anyone around Vernham Dean asks, "have I ruined it?", is usually no. Petrol in Diesel is who to call, with your engine kept off, so it stays that way. What petrol really does to a diesel, how to gauge how far it's gone, and how to stop it from happening again: that is the rest of this page.
Inside the engine: what petrol in a diesel does
Passing through an engine, diesel does two jobs at once. It combusts, and before it combusts it lubricates. Built to very fine gaps, the injectors and your pump depend on the diesel flowing through them to stop their surfaces wearing against one another.
The second job petrol doesn't do at all, and the first it does badly. The rattling comes from petrol being designed not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips away the protection the fuel system rests on, and any pump running on that mixture is wearing itself.
Put those together and the shape of the problem is plain. Not contact but movement is what causes the harm. All a tank with petrol in it amounts to is a fuel issue. Whatever a worn pump sheds goes on, borne by the fuel, into your injectors further along, which is why a pump that has been working on the petrol is where a mechanical issue begins.
Vernham Dean, petrol in a diesel: four cases, from mild to major
Filled up, never started. The best case there can be. On a forecourt, and truly only there, the petrol is still confined to your tank — since anywhere else the vehicle was driven to reach it. The task is emptying and rinsing on the spot.
Ignition on, or started for a moment. Petrol has come out of that tank and got to the fuel filter and the lines, since the fuel system has been bled. Normally nothing more than draining, purging and seeing to the filter, so still easy.
A few miles driven, and the pump has spent every one of them running on thinned fuel. How hard the vehicle was driven counts as much as how far, and this work covers that tank, your lines, your filter and fresh fuel through the entire system. Short trips, like the school run to Vernham Dean Gillum's Church of England Primary School, are one thing. Any mileage on the M4, under 10 miles from Vernham Dean, means the engine working hard throughout, and a run to Winchester, under 25 miles away, is a very different task as well.
Driven till it protested. Rattling, a ragged idle, smoke, a throttle that has gone soft. What you are hearing is the motor signalling fuel that no longer acts like diesel. Stop where you are — on the verge on Bulpits Hill, at the kerb, down a side road — and don't move it again. Permanent damage is very uncommon if a car is pulled over quickly, and the fuel drain and flush-through that still come first deal with it.
Stories Vernham Dean motorists hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. A fuller tank of the same mixture is all it gives, since topping up takes out nothing. Percentage is not how a diesel fuel system copes with petrol, whatever that guidance supposes.
If anything, the opposite is true. Myth: "A modern diesel can cope with a bit of petrol." Lubrication counts more on newer diesels, not less, since their fuel passes through finer parts at higher pressure.
This is the one that fools motorists. Myth: "If it starts and drives, there's no damage done." A petrol engine fed diesel normally won't run, so the driver stops and the damage stops with them. Whilst your pump wears, a diesel fed petrol usually starts, idles and drives away as if nothing has happened. Running is not the same as fine.
An old fix for a separate issue lies behind this one. Myth: "Add some two-stroke oil and drive it home." That petrol is still inside that tank after that, and what it has weakened is not put back.
"Drain it yourself and you are sorted" — a myth, because after it has been running some petrol lies in the fuel filter and lines, ready to go right back through your pump at your next start. Draining petrol into a can by the kerbside is also really hazardous.
Why petrol in a diesel takes place so easily
On purpose? Never. Through carelessness? Rarely, 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 vehicle at all. The forecourt makes it simple, and the slip runs one way.
It occurs when routine and your car stop matching. Any vehicle that's new to you — hired, on loan as a courtesy car, or just bought. Two motors on one drive, one petrol, one diesel. A forecourt you know, only with its pumps laid out differently. Fuelling up in a rush on the way to Bedwyn, with a train to catch. Years of petrol cars behind you, a diesel Ford Focus in front of you on the forecourt for its first tank — that is when. Throw in a back seat full of kids, a phone call or rain, and the hand takes over.
Preventing petrol in a diesel next time you fill up around Vernham Dean
- The label is what counts, and so check the pump rather than the colour: in the UK unleaded handles are normally green and diesel black, but not on each forecourt.
- Inspect the filler flap. Many cars state the fuel inside the flap or on the cap. Look at it on your first fill in any motor you don't know.
- A coloured fob or a sticker on the diesel's key achieves more than any amount of meaning to remember, in a home with one of each.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump. It seems silly and it does the trick.
- Mistakes like this are easy to make whilst your mind is on something else, and so the phone goes 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 remainder. Count it as a backstop, and keep reading the petrol pump.
- Spotting it mid-fill? Stop at once. A weaker mix results from less petrol in your tank, yet the next stage remains the same: do not crank it.
Petrol already in a diesel in Vernham Dean? Start here
Then the order of things is brief. Do not start it, and don't switch the ignition on. Still at the forecourt, at Dean Garage or anywhere else? Ask the attendants to help you push the car clear of the petrol pump. Then ring 0333 366 0103 and tell us what went in, roughly how much, and whether it has run.
If it was AdBlue and not petrol, say so. That's a different problem — corrosion and deposits instead of lost lubrication — and it has its own page for Vernham Dean.
Why one petrol in a diesel task around Vernham Dean costs more than another
A fair single quote doesn't exist here: four situations, four separate jobs. Which of them you are in is chiefly what moves the cost. Where the car is matters too, and whether a technician can safely reach it, after the ratio of petrol to what the tank takes.
What was put in, how much, and whether it has run — three queries we ask before pricing, not after, for precisely that reason. Given the answers, there is a straight figure instead of a range.
About Vernham Dean, for a moment
Vernham Dean is a small village in north Hampshire, situated in a rural area at an elevation of around 138 metres. Vernham Dean lies near the villages of Vernham Bank and Vernham Row, and is characterized by its predominantly detached housing stock. Vernham Dean is located approximately 19 miles from Winchester and 61 miles from London, making it a relatively secluded community. Vernham Dean remains a quiet, residential village with a small population of around 541 people.
Vernham Dean and Hampshire: where our fuel drain cover runs
Vernham Bank, Vernham Row and Woodside are among the places around Vernham Dean that the same teams work, answering petrol in diesel call-outs across Vernham Dean's SP postcode area. You need not move the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations where we work.
In Vernham Dean and still at the pump?
The best place there is, then — that's where you are. Ring, and leave it turned off.