How Worried Should You Be? Petrol in a Diesel Car in Bishopsteignton
Less than you likely are, provided it hasn't been started. Everyone in Bishopsteignton begins with "have I wrecked it?", and the honest answer is generally no: petrol resting in your tank of a diesel stays harmless until priming, cranking or driving draws it into your fuel system. Keep it that way: leave the motor off and phone Petrol in Diesel. Keep reading for three things: the effect petrol has inside a diesel motor, the signs of how far it has spread, and the way to make sure you don't do it again.
Petrol in a diesel: what does it do to your engine?
Diesel does two tasks on its way through an engine. Oiling comes before burning; it does both. The high-pressure pump and the injectors are made to very fine clearances, and your diesel passing through them is what stops those surfaces from wearing down against one another.
Badly at the first, not at all at the second: that's petrol. It is thinner than diesel and strips away the protection your fuel system rests on, and so a pump running on a petrol mix is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That is where the rattling comes from.
Combined, those make the shape of the trouble plain. Contact does not do the damage — movement does. Where that petrol is only in that tank, it's an issue of fuel, nothing more. Whatever a worn pump sheds travels on, borne by your fuel, into the injectors downstream, which is why a pump that has worked on the petrol is where a mechanical problem begins.
How serious is petrol in a diesel? Four scenarios our technicians see around Bishopsteignton
Fuelled up, never started. The best case there can be. Just that tank has petrol in it, so the job is draining that tank and cleaning the system where the vehicle sits. This situation can only truly occur on a forecourt: anywhere else, the vehicle got there by being driven.
Started for a second, or only the ignition on. With the system primed, your lines and filter now contain petrol that came from your tank. That is generally still a straightforward job — a drain, a flush, and the filter dealt with.
Those few miles on the road were the pump running on fuel thinned by petrol the whole way. Distance is only half of it; how hard it was driven counts equally. Either way this work runs to that tank, your lines, the filter and fresh fuel through the entire system. Driving the kids to Bishopsteignton School is one kind of trip. Any mileage on the M5, under 10 miles from Bishopsteignton, means the motor has worked hard throughout, and a run to Exeter, under 15 miles away, is a very different job too.
It complained, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone ragged. The fuel is not acting like diesel any more, and your motor is telling you. Leave it wherever it has stopped: a lay-by, a quiet street, the verge on Fore Street. The fuel drain and flush still come first, and they deal with it: when a car is pulled over soon, lasting damage is very rare.
Petrol in a diesel stories Bishopsteignton motorists hear
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Topping up takes out nothing; it gives you a bigger tank of the same mix. That guidance presumes a diesel fuel system tolerates petrol by percentage. It does not.
"Newer diesels can handle a little petrol" — a myth, and nearer the opposite. Lubrication matters more on newer diesels, not less, since their fuel runs through smaller components at higher pressure.
The myth that catches people out: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it usually will not run, so the motorist stops — and the harm stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile the pump wears. Running isn't the same as fine.
An old fix for a distinct fault is 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 contains that petrol.
Myth: "Drain the tank yourself and you are sorted." After the engine has been run, some of the petrol is no longer in your tank: it is in your filter and your lines, and it goes right back through the pump at the next start. Besides, petrol cleared into a can by the road is truly dangerous.
Why petrol in a diesel occurs at all
It is seldom carelessness, and nobody does it on purpose. The petrol nozzle is the narrower of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly 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. Hire cars, courtesy cars, and vehicles that are new to you. Households running one of each, petrol and diesel. A familiar forecourt with the pumps in a different order. A train to catch, and a rushed fill on the way to Teignmouth. Years of petrol motors behind you, a diesel BMW 3 Series in front of you on the forecourt for its first tank — that's when. With rain, a call arriving, or children to deal with, the hand simply does what it has always done.
Bishopsteignton people: how to avoid petrol in a diesel next time
- Check the pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on every forecourt. The label is what matters.
- Many vehicles state the fuel inside your filler flap or on the cap, and so check there on the first fill in a car you do not know.
- A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, for a house with one of each.
- Before the nozzle comes off the pump the first time you fill a hired or new vehicle, say "diesel" aloud. Silly, perhaps, but it does the trick.
- Mistakes like this are easy to make while your mind is on something else, so the phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to reject a petrol nozzle, and add-on devices exist for vehicles without one. They are a safety net, not a reason to stop reading the pump.
- As soon as you realise, stop: less petrol in your tank means a thinner mixture. What to do next doesn't change, though — still do not start the vehicle.
Put petrol in a diesel in Bishopsteignton already?
The order of things is short, then. Don't switch your ignition on, and do not fire it up. If you are still at the forecourt — Morrisons or anywhere else — ask the attendants to help you push the vehicle clear of the pump. What got in, about how much, and whether it's run: tell us that when you phone 0333 366 0103.
Corrosion and deposits form the trouble with AdBlue, whereas petrol means lost protection. So if it was AdBlue, say so — and read its own Bishopsteignton page.
One petrol in a diesel task in Bishopsteignton costs more than another. Why?
An honest single price does not exist here: four situations, four separate tasks. What moves the cost is chiefly which of them you are in. Beyond that it is the ratio — how much petrol was put in against how much your tank takes — and then where the vehicle is and whether a van can reach it safely.
That's why our engineers ask three queries before quoting rather than after: what got in, how much, and whether it has run. Given those answers, there is a straight figure instead of a range.
About Bishopsteignton
Bishopsteignton is a village in Devon, situated on the coast near the estuary of the River Teign, with Ash Hill and Humber to the north and Combeinteignhead to the south. Bishopsteignton sits at an elevation of around 72 metres, overlooking the surrounding countryside and the sea. Bishopsteignton has a population of approximately 1914 people, predominantly living in detached houses. Bishopsteignton is located near the city of Exeter, about 11.7 miles away, and is around 162.3 miles from London.
Across Devon and around Bishopsteignton: fuel drain cover
Petrol in diesel call-outs around Bishopsteignton — part of the TQ postcode area — go to teams that likewise cover the places about it, Ash Hill, Humber and Combeinteignhead included. Our engineers drain where your car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the petrol pump around Bishopsteignton?
In that case, you couldn't be in a better spot. Ring, and leave it switched off.