Petrol in a Diesel Car in Glapwell: How Worried Should You Be?
Not started? Then less worried than you likely feel. Everyone around Glapwell begins with "have I ruined it?", and the honest answer is generally no: petrol resting inside that tank of any diesel remains harmless till priming, cranking or driving pulls it into the system. Keep it like that: leave your engine off then call Petrol in Diesel. The remainder of this page sets out what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it does not happen to you a second time.
Inside the motor: what petrol in a diesel does
Two tasks fall to diesel on its route round a motor. Before it ignites, it protects — then it burns. Made to very fine gaps, the fuel injectors and the pump depend on your diesel flowing through them to stop their surfaces wearing against one another.
Of these two tasks, petrol handles the first poorly and the second never. The rattling comes from petrol being made not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips out the lubrication the system rests on, and any pump running on such a blend is wearing itself.
Combined, those make the shape of the issue clear. It is movement that causes the damage, not contact. Where that petrol is only in the tank, it is an issue of fuel, nothing more. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with your fuel to your injectors downstream.
How serious is petrol in a diesel? Four situations our engineers see around Glapwell
Fuelled up, not once started. The best case there is. Being on a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With that petrol kept in that tank alone, it's cleared and purged on the spot, and nothing more is needed.
Started for a moment, or just the ignition on. Petrol has come out of your tank and got to the filter and the fuel lines, since your system has been primed. Still usually easy: drain, flush, and your filter seen to.
Some miles driven, and the pump has spent each of them running on weakened fuel. Mileage is only half of that; how hard it was driven counts equally. Either way the work includes the tank, the lines, the filter and fresh fuel through the whole circuit. Short trips, such as the school run to Bramley Vale Primary & Nursery School, are one matter. Very different again: a run to Sheffield, under 25 miles away, or any distance on the M1, under 3 miles from Glapwell, where the engine kept labouring hard.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone ragged. That is the motor telling you its fuel no longer is acting like diesel. Leave it wherever it has stopped: a lay-by, a quiet street, the verge on Hardwick Avenue. A vehicle pulled over soon very seldom has long-term damage, as the drain and the flush, which still come first, deal with it.
Stories Glapwell 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 is removed by topping up — you're left with a fuller tank, still the same mix. Percentage is not how a diesel fuel system copes with petrol, whatever that advice supposes.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the opposite. Smaller parts and higher pressure are how a current diesel runs its fuel, and that makes the protection matter more, not less.
This is the one that fools drivers. Myth: "If it starts and drives, there's no damage done." Diesel in a petrol motor normally means a motor that will not run: the motorist stops, and so does the harm. A diesel fed petrol usually starts, ticks over and drives away as though nothing has happened, whilst the pump wears. Fine and running are not the same at all.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a distinct issue. That petrol is still in the tank after that, and whatever it has thinned is not put back.
"Drain it yourself and you're sorted" — a myth, because after it's been running some petrol sits in your filter and lines, ready to go right back through the pump on the next start. And, a can of petrol drained at the roadside is genuinely hazardous.
How it happens: petrol in a diesel
It is seldom carelessness, and nobody does it on purpose. A diesel nozzle generally will not fit a petrol motor, yet the smaller petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error easy, and only in one direction.
The moment habit stops matching your car is the moment it occurs. A new car, a hire car or a courtesy car. Households running one of each, petrol and diesel. A forecourt you know, but with its pumps laid out differently. Fuelling up in a hurry on the way to Shirebrook, with a train to catch. Precisely the moment it takes place: after years of driving petrol, someone fills a diesel Renault Megane for the first time. Throw in rain, a phone call or a back seat full of children, and your hand repeats what it has always done.
Glapwell drivers: how to avoid petrol in a diesel next time
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most generally do. Read the petrol pump's label; the colour is just a hint.
- The first fill in a new car is the time to check your filler flap — inside it, or on the cap, many motors state the fuel they take.
- One of each in the home? Mark your key to the diesel — a bright fob, a sticker — since intending to remember isn't enough.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump. It sounds silly and it works.
- Put the phone away. This is an easy mistake to make while you are thinking about something else.
- Add-on devices exist for vehicles without one, and some diesels come with a filler that will not accept a petrol nozzle. Helpful — but a backstop only, never a reason to stop checking the label.
- Stop the moment you realise. Less petrol inside the tank means a weaker mix. It doesn't change what to do next, which is still not to start the vehicle.
Put petrol in a diesel in Glapwell already?
Then the order of things is brief. Leave it unstarted, with the ignition switched off too. If you're still at the forecourt — Shell or anywhere else — ask the staff to help you push the vehicle away from the petrol pump. Next, 0333 366 0103. We will ask what was put in, roughly how much, and if it has been run.
If it was AdBlue rather than petrol, say so. That is a separate issue — corrosion and deposits instead of lost protection — and it has its own page for Glapwell.
What makes one Glapwell petrol in a diesel task cost more than the next
There's no fair single price for this, because the four situations above are four separate tasks. The situation itself does most of the work of moving your cost. Two things follow that: the petrol that was put in as a proportion of what the tank holds, then the place the vehicle is in and whether our van can get to it safely.
What was put in, how much, and if it's run — three questions we ask before pricing, not after, for exactly that reason. Those answers turn a range into a straight figure.
About Glapwell, for a moment
Glapwell is a small village in Derbyshire, situated in the East Midlands region of England, with an elevation of around 176 metres. Glapwell lies approximately 15 miles south of Sheffield and is surrounded by nearby villages such as Rowthorne and Stony Houghton. Glapwell has a population of around 1559 people, predominantly living in semi-detached housing. Glapwell is located inland, about 126 miles north of London.
Glapwell and Derbyshire: where our fuel drain cover reaches
Petrol in diesel call-outs around Glapwell — part of the S postcode area — go to teams that likewise cover the spots round it, Rowthorne, Stony Houghton and Ault Hucknall among them. No need to bring your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all places where we work.
In Glapwell and still at the pump?
The best position there is, then — that's where you are. Phone, and keep it turned off.