How Worried Should You Be? Petrol in a Diesel Car in Drynham
Less than you likely are, provided it hasn't been started. Until your ignition primes the pump, the starter cranks, or your car is driven, petrol in a diesel tank just waits there and does no harm. Which means the honest reply to that first Drynham query — "have I ruined it?" — normally no. Keep it that way: leave your motor off then call Petrol in Diesel. Below, you will find what petrol really does inside a diesel, how far it might have gone, and how to stop it happening to you again.
What petrol in a diesel does to the motor
Diesel has two jobs on its way through an engine. It protects first, and after that does it burn. Very fine gaps go into the injectors and your high-pressure pump, and only your diesel running through keeps their surfaces from grinding together.
Poorly at the first, not at all at the second: that's petrol. A pump working on a petrol blend is wearing itself out, since petrol is runnier than diesel and strips out the lubrication your fuel system depends on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that's where any clattering comes.
Put these together and the shape of the issue is clear. Not contact but movement is what causes the harm. All a tank with petrol in it amounts to is a fuel issue. The beginning of a mechanical problem is a pump that has been running on that petrol — and whatever a worn pump sheds travels on with the fuel to your injectors downstream.
How bad is petrol in a diesel? Four scenarios we see in Drynham
Filled up, not once started. The best case there can be. Being on a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With the petrol held in that tank alone, it is drained and purged on the spot, and nothing more is needed.
Ignition on, or started for a second. Petrol has come out of your tank and reached the fuel filter and the fuel lines, since the fuel system has been bled. Normally little more than clearing, flushing and sorting the fuel filter, so still simple.
A few miles driven, and your pump has spent each of them running on diluted fuel. Miles is only half of it; how hard it was driven counts just as much. Either way this work includes the tank, your lines, the fuel filter and fresh fuel through the whole system. Short trips, such as the school run to Willowbrook Primary School, are one matter. Any mileage on the M4, under 15 miles from Drynham, means your engine working hard throughout, and a run to Bath, under 10 miles away, makes a very different task too.
Rattling, a ragged idle, smoke, a throttle gone soft: driven till it complained. The engine is telling you the fuel is no longer acting like diesel. Pull up wherever you are — the verge on Kingfisher Close, a lay-by, a side street — and leave the vehicle where it is. Permanent damage is very unusual when a vehicle is stopped soon, and the drain and flush-through that still go first take care of it.
What Drynham drivers get told about petrol in a diesel — and the stories in it
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Topping up removes nothing; it gives you a bigger tank of the same mix. Percentage isn't how a diesel fuel system tolerates petrol, however much that advice assumes.
Myth: a current diesel copes with a bit of petrol. Rather, the opposite. At higher pressure, through smaller parts: that is how a newer diesel moves its fuel, so the protection counts more, not less.
The myth that catches drivers out: if it starts and drives, it must be unharmed. A petrol engine fed diesel normally won't run, so the driver stops and the harm stops with them. Feed petrol to a diesel and it normally starts, ticks over and pulls away as if nothing happened — all the while its pump is wearing. Fine and running aren't the same at all.
Myth: a two-stroke additive lets you to drive home. It is an old workaround, supposed for another problem. It doesn't put back what petrol has weakened, and the petrol is still in your tank later on.
If your engine has been run, part of the petrol is in the fuel filter and the lines, not your tank — and your next start sends it straight back through your pump. So the myth "drain your tank yourself and you're sorted" does not hold. It is also truly hazardous to drain petrol into a can at the roadside.
Petrol in a diesel: how does it take place?
On purpose? Never. Through carelessness? Rarely, if ever. The forecourt makes it simple: the petrol nozzle is the slimmer of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle mostly won't go into a petrol motor at all. So the slip runs one way.
It happens when routine and your car stop matching. A new vehicle, a hire car or a courtesy car. A household with one petrol and one diesel on the driveway. The pumps in a different order on a well-known forecourt. Racing for a train outside Trowbridge and filling up en route. Years of petrol vehicles behind you, a diesel Volkswagen Tiguan in front of you at the forecourt for its first tank — that's when. With rain, a call arriving, or a car full of children to deal with, the hand simply does what it has always done.
Drynham people: how to prevent petrol in a diesel next time
- The label is what counts, and so check the pump instead of the colour: in the UK unleaded handles are normally green and diesel black, but not on each forecourt.
- Plenty of cars state the fuel type inside the filler flap or on the cap, so check it on your first fill in a motor you do not know.
- One of each in the home? Label your key to the diesel — a bright fob, a sticker — since intending to remember isn't enough.
- It sounds silly and it works: on the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump.
- While you're thinking about something else, this is an easy mistake to make — so tuck your phone away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to block a petrol nozzle, and add-on devices are available for cars without one. They are a safety net, not a reason to stop checking the petrol pump.
- Less petrol makes a thinner blend, so stop as soon as you realise — though remembering that your next step is unchanged. It is still not to start it.
Already put petrol in a diesel around Drynham?
Short and simple, then, is the order of things. Do not switch your ignition on, and do not start it. If you are still at the forecourt — BP or anywhere else — ask the attendants to help you roll the car away from the pump. Call 0333 366 0103 next, with three answers — the fuel, the approximate amount, and whether it has run.
Corrosion and deposits are the issue with AdBlue, whereas petrol brings lost lubrication. So if it was AdBlue, say so — and read its own Drynham page.
Drynham petrol in a diesel jobs: why one costs more than another
Four different jobs lie behind the four scenarios above — which is why there is no honest single price. Chiefly, the cost shifts with which one you are in. Where the car is matters too, and whether a technician can safely get to it, after the ratio of petrol to what that tank takes.
That is why our engineers ask three questions before quoting rather than after: what was put in, how much, and whether it has run. Their replies are what change a range into one firm number.
About Drynham and its setting
Drynham is a locality in Wiltshire, situated on the riverside at an elevation of 41 metres, with detached housing being the predominant type of accommodation. Drynham lies near the city of Bath, approximately 8.8 miles away, and is also close to other nearby places such as Lower Studley and Longfield. Drynham has a population of around 702 residents and is located in the South West region of England, about 90.2 miles from London. Drynham is part of the wider rural landscape of Wiltshire, with the River Avon flowing nearby.
Fuel drain cover around Drynham and across Wiltshire
Petrol in diesel jobs around Drynham — part of the BA postcode area — go to vans that likewise cover the spots about it, Lower Studley, Longfield and North Bradley included. We drain where the car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
Drynham: still at the pump?
Nothing beats it: that's where you are. Keep the vehicle switched off, and ring.