Should You Worry? Petrol in a Diesel Car in Burn Bridge
Less than you likely are, provided it hasn't been started. Petrol resting in a diesel tank does nothing to the engine till something draws it through the system — the ignition priming your pump, the starter, or driving on its own. So the truthful answer to the first query anyone around Burn Bridge asks, "have I ruined it?", is normally no. To leave the car like that, phone Petrol in Diesel then leave your engine switched off. The rest of this page covers what petrol really does to a diesel, how to judge how far it has got, and how to make sure it does not happen to you again.
Petrol in a diesel: what does it do to your engine?
On its way through a motor, diesel has two tasks. Lubricating comes before burning; it does both. Designed to very fine tolerances, the injectors and the pump rely on your diesel flowing through them to stop their surfaces wearing against one another.
Of these two jobs, petrol manages the first badly and the second not at all. It's runnier than diesel and takes away the protection your fuel system rests on, and so a pump running on a petrol blend is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That's where the knocking comes from.
Put those together and the shape of the problem is plain. Contact doesn't do the harm — circulation does. All a tank with petrol in it amounts to is a fuel issue. A pump that has been working on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with your fuel to the fuel injectors downstream.
How bad is petrol in a diesel? Four situations we see around Burn Bridge
Filled up, and never started: nothing beats it. That petrol is in the tank and only your tank, and the task is a drain and a flush where your car sits. This is the one situation that can only truly take place on a forecourt, as anywhere else the vehicle has been driven to get there.
Started for a moment, or just the ignition on. The fuel system has been bled, and so petrol has left your tank and reached your filter and your lines. That is generally still an easy task — a drain, a flush, and the filter dealt with.
Driven a few miles. Now your pump has spent these miles working on thinned fuel. How hard the car was driven counts as much as how far, and the work covers the tank, the fuel lines, your filter and clean fuel through the whole circuit. The school run to Pannal Primary School is one matter. A run as far as Leeds, under 15 miles away, is a very different task. So is any miles on the A1(M), under 10 miles from Burn Bridge, where your engine has been labouring hard the whole time.
Driven till it complained. Knocking, an uneven idle, smoke, a throttle that has gone soft. What you are hearing is your engine signalling fuel that no longer runs like diesel. Stop where you are — on the verge on Mill Lane, at the kerb, down a side road — and don't move it again. A vehicle pulled over early very rarely has long-term damage, as the fuel drain and the flush-through, which still come first, take care of it.
What Burn Bridge drivers get told about petrol in a diesel — and the myths in it
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing is removed by topping up — you're left with a bigger tank, still the same mixture. Percentage isn't how a diesel fuel system copes with petrol, however much that guidance presumes.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. A current diesel runs its fuel through smaller parts at higher pressure, which makes the lubrication matter more, not less.
"It starts, it drives, and so there is no harm" — the myth that trips up more people than any other. Feed diesel to a petrol motor and it usually will not run, and so the motorist stops — and the damage stops with them. While your pump wears, a diesel fed petrol normally starts, idles and drives away as though nothing has happened. Fine and running aren't the same at all.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a separate fault. That petrol is still inside that tank afterwards, and what it has thinned isn't put back.
Myth: "Drain the tank yourself and you are sorted." Once the engine has run, some of the petrol is no longer inside that tank: it's in the filter and the lines, and it goes right back through your pump on the next start. It's also genuinely dangerous to drain petrol into a can by the kerbside.
How it happens: petrol in a diesel
No one does it on purpose, and it's seldom carelessness. A diesel nozzle generally won't fit a petrol car, but the slimmer petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error simple, and only in one direction.
When routine and the vehicle stop matching, it happens. A new car, a hire car or a courtesy car. One petrol and one diesel on the driveway of the same household. The pumps in a different order on a familiar forecourt. A hurried fill on the way to Pannal with a train to catch. Exactly the moment it takes place: after years of driving petrol, someone fills a diesel Volkswagen Golf for the first time. Add rain, a phone call or a back seat full of children, and the hand does what it has always done.
How to avoid petrol in a diesel at your next fill-up around Burn Bridge
- Read the petrol pump, not the colour. In the UK unleaded handles are generally green and diesel black, yet not on each forecourt. The label is what matters.
- Plenty of cars 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.
- Label your key. In a household with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- Before the nozzle leaves the pump the first time you fuel a hired or new vehicle, say "diesel" out loud. Silly, yes, but it does the trick.
- Tuck your phone away. This is an easy mistake to make while you are thinking about something else.
- Some diesels come with a filler designed to refuse a petrol nozzle, and devices you can add exist for cars without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the pump.
- The moment you realise, stop: less petrol in your tank makes a thinner mix. What to do next does not change, though — still don't fire it up.
Burn Bridge: already put petrol in a diesel?
The order of things is brief, then. Starting it is out, and so is turning on your ignition. The staff at the forecourt — whether at BP itself or wherever you filled up — will normally help roll it clear of the petrol pump if you ask. Then ring 0333 366 0103 and tell us what went in, roughly how much, and if it's run.
Say so if it was AdBlue instead of petrol: it is a separate fault, with its own page for Burn Bridge, since AdBlue brings corrosion and deposits rather than lost protection.
Burn Bridge petrol in a diesel tasks: why one costs more than another
An honest single price doesn't exist here: four situations, four separate tasks. The situation itself does most of the work of moving your cost. The share matters next, meaning how much of the tank is petrol, and then the location of the vehicle and whether getting to it is safe for our van.
Ahead of any quote, not after, come three questions: your fuel that got in, the quantity, and whether it's run. That is why. A range turns into a straight figure when those answers are in.
About Burn Bridge, for a moment
Burn Bridge is a locality in North Yorkshire, situated on the riverside at an elevation of 87 metres, with detached housing being the predominant type of accommodation. Burn Bridge lies near the cities of Leeds and Harrogate, and is close to nearby places such as Pannal and Daw Cross. Burn Bridge has a population of approximately 1648 residents, and is located about 10.9 miles from Leeds. Burn Bridge is part of the wider Leeds urban area, but retains its own distinct character.
Burn Bridge and North Yorkshire: where our fuel drain cover reaches
Burn Bridge rests in the HG postcode area, and our teams that answer petrol in diesel jobs there work the spots around it as well — Pannal, Daw Cross and Spacey Houses among them. You need not bring your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations where we work.
Still at the petrol pump in Burn Bridge?
Then you're in the best spot there can be. Call, and leave it turned off.