Should You Worry? Petrol in a Diesel Car in Donisthorpe
Likely less than you are now — provided no one has started the vehicle. Until your ignition primes your pump, the starter turns, or the car is driven, petrol in a diesel tank simply rests there and does nothing. Which makes the truthful reply to that first Donisthorpe question — "have I ruined it?" — usually no. Keep it like that: leave the motor off then phone Petrol in Diesel. What petrol really does to a diesel, how to gauge how far it has travelled, and how to keep it from happening a second time: that's the remainder of this page.
The engine and petrol in a diesel: what goes on
Diesel has two tasks on its way through a motor. Before it ignites, it lubricates — and then it burns. Built to very fine gaps, your injectors and your pump depend on the diesel moving through them to keep their surfaces from wearing against one another.
Badly at the first, not at all at the second: that's petrol. A pump working on a petrol mixture is wearing itself out, because petrol is runnier than diesel and takes away the protection your fuel system depends on. Petrol is also made to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that is where any knocking starts.
Together, those leave the shape of the issue clear. The harm is done by circulation, not by contact. All a tank with petrol in it amounts to is a fuel issue. Whatever a worn pump sheds travels on, carried by your fuel, into the fuel injectors downstream, which is why a pump that has been working on that petrol is where a mechanical problem begins.
How bad is petrol in a diesel? Four scenarios our technicians see in Donisthorpe
Filled up, never started. The best case there can be. Only that tank has petrol in it, so the job is draining that tank and rinsing the system where the car sits. This scenario can only really occur at a forecourt: anywhere else, the vehicle got there by being driven.
Ignition on, or started for a moment. Once primed, the system has drawn petrol out of your tank as far as the filter and the lines. Still normally easy: drain, flush, and the fuel filter sorted.
Those few miles driven meant your pump working on fuel diluted by petrol throughout. How hard the car was driven matters as much as how far, and the work takes in that tank, your lines, your filter and fresh fuel through the entire circuit. Short trips, such as the school run to Donisthorpe Primary School, are one thing. Any mileage on the M42, under 3 miles from Donisthorpe, means your engine has worked hard throughout, and a run to Lichfield, under 15 miles away, makes a very different task as well.
It complained, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone uneven. The motor is telling you the fuel is no longer behaving like diesel. Stop on the spot — on the verge on New Street, at the kerb, down a side road — and don't move it. A car stopped quickly very rarely has lasting damage, because the fuel drain and the flush-through, which still come first, take care of it.
Myths Donisthorpe motorists hear about petrol in a diesel
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing comes out when you top up — your tank just carries more of the same blend. That guidance assumes a diesel fuel system handles petrol by percentage. It doesn't.
Myth: "A current diesel can cope with a bit of petrol." If anything, the opposite. A modern diesel sends its fuel through more precise parts at higher pressure, which makes the lubrication matter more, not less.
This is the one that catches motorists. Myth: "If it starts and drives, there is no harm done." Feed diesel to a petrol motor and it normally will not run, so the motorist stops — and the harm stops with them. Feed petrol to a diesel and it generally fires up, idles and pulls away as if nothing has happened — all while its pump is wearing. Running isn't the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a separate issue. The petrol is still in your tank afterwards, and whatever it has diluted isn't put back.
Myth: "Drain your tank yourself and you are sorted." After the engine has been run, some of the petrol is no longer inside the tank: it's in your filter and the fuel lines, and it goes right back through the pump on the next start. It is also genuinely dangerous to drain petrol into a can at the roadside.
How petrol ends up: petrol in a diesel
On purpose? Never. Through carelessness? Rarely, if ever. A diesel nozzle generally will not fit a petrol vehicle, but the narrower petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake easy, and just in that direction.
When habit and your car stop matching, it takes place. A new motor, a hire car or a courtesy car. One petrol and one diesel on the drive of the same household. A well-known forecourt with the pumps in a different order. Filling up in a rush on the way to Burton-On-Trent, with a train to catch. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you at the forecourt for its first tank — that is when. Add a back seat full of kids, a phone call or rain, and the hand takes over.
Donisthorpe people: how to prevent petrol in a diesel next time
- The label is what counts, so check the pump instead of the colour: in the UK unleaded handles are normally green and diesel black, yet not on each forecourt.
- The first fill in a strange vehicle is the time to check the filler flap — on it, or on the cap, plenty of motors state the fuel they take.
- A coloured fob or a sticker on your diesel's key achieves more than any amount of intending to remember, in a home with one of each.
- It seems silly and it works: on your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump.
- Whilst you're thinking about something else, this is an easy mistake to make — so put your phone away.
- Add-on devices exist for vehicles without one, and some diesels are built with a filler that will not take a petrol nozzle. Useful — but a safety net at best, never a reason to stop checking the label.
- Stop the moment you realise. Less petrol inside that tank makes a thinner blend. It doesn't change what to do next, which is still not to fire it up.
Petrol already in a diesel in Donisthorpe? Begin here
The order of things is brief, then. Leave it unstarted, with your ignition switched off too. If you are still on the forecourt — Esso or anywhere else — ask the staff to help you roll it clear of the petrol pump. Then ring 0333 366 0103 and tell us what was put in, about how much, and if it's run.
If it was AdBlue and not petrol, say so. That is a separate fault — corrosion and deposits and not lost protection — and it has its own page for Donisthorpe.
Donisthorpe petrol in a diesel tasks: why one costs more than another
The four scenarios above are four different jobs, so no single price for this would be fair. Chiefly, your cost shifts with which situation you're in. Beyond that it is the ratio — how much petrol was put in against how much your tank holds — and after that where the car is and whether our van can get to it safely.
What was put in, how much, and whether it has run — three questions our technicians ask before quoting, not after, for exactly that reason. Their replies are what turn a range into one firm number.
About Donisthorpe
Donisthorpe is a village in Leicestershire, situated on the riverside in the East Midlands region of England. Donisthorpe sits at an elevation of 107 metres, near the communities of Oakthorpe and Short Heath. Donisthorpe has a population of around 1471 people, predominantly living in detached housing. Donisthorpe is located approximately 12.5 miles from Lichfield and 103 miles from London.
Fuel drain cover across Leicestershire, Donisthorpe included
Oakthorpe, Short Heath and Acresford are among the places near Donisthorpe that the same teams work, answering petrol in diesel calls across Donisthorpe's DE postcode area. A forecourt, a supermarket car park, a lay-by or your own driveway are all locations we work, and the car doesn't need to move to us.
Donisthorpe: still at the pump?
The best place there is, then — that's where you are. Call, and leave it switched off.