How Worried Should You Be? Petrol in a Diesel Car in Ebdon
Unstarted? Then less worried than you likely are. Petrol resting in a diesel tank does nothing to your engine until something draws it through the system — your ignition priming your pump, your starter, or driving itself. So the truthful answer to the first question everyone in Ebdon asks, "have I wrecked it?", is normally no. Leave your engine off then call Petrol in Diesel — that keeps it like that. 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
Two tasks fall to diesel on its journey through a motor. It lubricates first, and only then does it burn. Your high-pressure pump and the injectors are made to extremely fine clearances, and the diesel passing through them is what keeps those surfaces from grinding against each other.
Of these two jobs, petrol manages the first badly and the second not at all. The rattling comes from petrol being designed not to ignite when compressed, which is precisely the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips away the lubrication your system depends on, and any pump running on that mix is wearing itself.
Combined, those make the shape of the issue clear. The damage is done by movement, not by contact. Petrol in the tank is a fuel fault. Whatever a worn pump sheds goes on, carried by your fuel, into the injectors further along, which is why a pump that has worked on the petrol is where a mechanical problem begins.
Ebdon, petrol in a diesel: four cases, from mild to serious
Fuelled up, not once started. The best case there can be. Being at a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With that petrol held inside your tank alone, it is drained and flushed right where it stands, and nothing more is needed.
Your ignition switched on, or a short start. Petrol has come out of the tank and got to the filter and the fuel lines, since the fuel system has been primed. Still generally easy: drain, flush, and the fuel filter dealt with.
Driven a few miles. Now the pump has spent these miles running on weakened fuel. The work is the tank, the fuel lines, your filter and fresh fuel through the whole circuit, and how hard your car was driven matters as much as how far. On the school run to Castle Batch Primary School Academy, the distance is short. Driving as far as Cardiff, under 15 miles away, makes a very different job — as does any mileage on the M5, under 3 miles from Ebdon, with the engine working hard the whole time.
Driven till it complained. Knocking, an uneven idle, smoke, a throttle that has gone soft. The engine is telling you the fuel is no longer acting like diesel. Stop where you are — on the verge on Wick Road, at the kerb, down a side road — and do not move it again. What comes first is still the drain and flush-through, and that deals with it, with lasting damage very uncommon when a car is pulled over quickly.
Petrol in a diesel stories Ebdon motorists hear
"Top it up the rest of the way with diesel and it will be fine" — a myth. It won't. Nothing is removed by topping up — you're left with a bigger tank, still the same mixture. Percentage is not how a diesel fuel system copes with petrol, however much that guidance presumes.
"Modern diesels can handle a little petrol" — a myth, and closer to the opposite. Smaller components and higher pressure are how a current diesel runs its fuel, and that makes the lubrication matter more, not less.
Myth: "If it starts and drives, there is no damage done." This is the one that catches drivers. Any petrol engine fed diesel generally won't run, and so the motorist stops and the harm stops with them. Feed petrol to a diesel and it normally starts, idles and drives away as if nothing has happened — all the while its pump wears. Running doesn't mean fine.
An old fix for a different issue is behind this one. Myth: "Add some two-stroke oil and drive the car home." None of what petrol diluted gets put back by it — and afterwards, that tank still holds that petrol.
The next start sends petrol back round your pump out of the fuel lines and the fuel filter, where some of that sits after the engine has been run. That's why a DIY tank drain does not sort it — a myth. Besides, petrol drained into a can by the road is truly hazardous.
How does petrol in a diesel occur?
Carelessness is rarely the cause, and nobody means to do it. One way only, since of the nozzles: the slimmer petrol one slips inside a diesel filler with almost no resistance, while the diesel one mostly won't fit a petrol vehicle. That is how the forecourt makes it simple.
When routine and the car stop matching, it occurs. Hire cars, courtesy cars, and vehicles that are new to you. Households running one of each, petrol and diesel. Your normal forecourt, its pumps suddenly in a different order. Racing for a train outside Worle and filling up en route. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist used to petrol: exactly when it occurs. Add a back seat full of kids, a phone call or rain, and the hand wins.
Next time you fill up around Ebdon: preventing petrol in a diesel
- Read the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on each forecourt. The label is what matters.
- Plenty of vehicles state the fuel inside your filler flap or on the cap, and so check there on your first fill in any motor you do not know.
- Label your key. In a home with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of intending to remember.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump. It seems silly and 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 have a filler built 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 reading the petrol pump.
- Stop the moment you realise. Less petrol inside your tank means a thinner mixture. It doesn't change what to do next, which is still not to crank it.
Ebdon: already put petrol in a diesel?
The order of things is brief, then. Do not turn the ignition on, and don't fire it up. Ask the staff to help you roll it away from the pump if you are still at the forecourt, whether that is Sainsbury's or anywhere else. Ring 0333 366 0103 next, with three facts — the fuel, the rough amount, and if it's run.
If it was AdBlue instead of petrol, say so. That's a different issue — corrosion and deposits and not lost lubrication — and it has its own page for Ebdon.
Why one petrol in a diesel job in Ebdon costs more than another
Four separate jobs lie behind the four scenarios above — which is why there's no fair single price. What moves the cost is mostly which of them you are in. Where the vehicle is matters too, and whether a technician can safely reach it, after the share of petrol to what the tank takes.
What got in, how much, and if it's run — three queries we ask before quoting, not after, for precisely that reason. Given the replies, there is a straight figure instead of a range.
About Ebdon, for a moment
Ebdon is a small suburban area located on the coast of Somerset, with an elevation of around 7 metres above sea level. Ebdon sits near the towns of Wick St Lawrence and Worle, and is close to the villages of Icelton. Ebdon has a population of approximately 1393 people, predominantly living in detached housing.
Ebdon and Somerset: where our fuel drain cover runs
Petrol in diesel calls in Ebdon — part of the BS postcode area — go to teams that likewise cover the locations about it, Wick St Lawrence, Icelton and Worle among them. Our engineers drain where your car is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
At the pump in Ebdon, still?
In that case, you could not be in a better spot. Leave the car switched off, and ring.