Petrol in a Diesel Car in Coatham: How Worried Should You Be?
Likely less than you already are — provided nobody has started the car. Petrol resting in a diesel tank does nothing to the motor till something draws it through the fuel system — your ignition priming the pump, the starter, or driving itself. So the fair answer to the first question everyone in Coatham asks, "have I ruined it?", is generally no. Petrol in Diesel is who to ring, with the motor kept off, and so it remains that way. Below, you will find what petrol really does inside a diesel, how far it might have got, and how to stop it happening to you a second time.
What petrol in a diesel does to the engine
Diesel does two tasks on its way through an engine. Before it ignites, it lubricates — and then it combusts. The high-pressure fuel pump and the injectors are made to extremely fine gaps, and your diesel passing through them is what stops those surfaces from grinding against each other.
Badly at the first, not at all at the second: that's petrol. A pump running on a petrol mix is wearing itself out, because petrol is thinner than diesel and strips out the lubrication the fuel system relies on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that's where the rattling starts.
The shape of the trouble is plain once you put those together. Contact doesn't do the damage — movement does. Where that petrol is only in the tank, it is a problem of fuel, nothing more. A pump that has been running on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with the fuel to your injectors further on.
Four scenarios our technicians see in Coatham: how bad is petrol in a diesel?
Filled up, not once started. The best case there is. The petrol is inside your tank and only that tank, and the task is a drain and a flush where the vehicle sits. This is the one scenario that can only really take place on a forecourt, since anywhere else your car has been driven to get there.
Your ignition switched on, or a brief start. Petrol has left that tank and reached the fuel filter and your lines, since your system has been bled. That's normally still a straightforward job — a drain, a flush, and your filter seen to.
Driven a few miles. Now the pump has spent those miles working on diluted fuel. How hard your car was driven matters as much as how far, and the work covers your tank, the fuel lines, the fuel filter and fresh fuel through the entire circuit. On the school run to Coatham Church of England Primary School, the mileage is short. Very different a second time: a run to Durham, under 25 miles away, or any mileage on the A1(M), under 25 miles from Coatham, where the engine never stopped running hard.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone lumpy. The fuel isn't behaving like diesel any more, and the motor is telling you. Stop on the spot — on the verge on Church Street, at the kerb, down a side road — and don't move it. Lasting damage is very unusual if a vehicle is pulled over early, and the fuel drain and flush that still go first deal with it.
Stories Coatham people hear about petrol in a diesel
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Nothing comes out when you top up — that tank just carries more of the same blend. The idea behind that advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
If anything, the opposite holds. Myth: "A current diesel can cope with a bit of petrol." Protection matters more on modern diesels, not less, since their fuel runs through finer components at higher pressure.
"It starts, it drives, so there is no harm" — the myth that trips up most motorists 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. A diesel fed petrol usually starts, ticks over and drives away as though nothing has happened, whilst your pump grinds. Running isn't the same as fine.
Myth: "Add some two-stroke oil and drive it home." It is an outdated fix for a different issue. It doesn't put back what petrol has weakened, and the petrol is still in that tank later.
Myth: "Drain your tank yourself and you're sorted." After your engine has run, some of that petrol is no longer inside the tank: it's in the filter and the fuel lines, and it goes straight back through the pump on the next start. Besides, petrol emptied into a can by the road is genuinely risky.
How does petrol in a diesel take place?
No one does it on purpose, and it's rarely carelessness. The petrol nozzle is the smaller of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol car at all. The forecourt makes it easy, and the error runs one way.
Habit and the car getting out of step is when it occurs. Courtesy car, hire car, or a car that is new. A household with one petrol and one diesel on the driveway. Your ordinary forecourt, its pumps suddenly in a different order. A hurried fill en route to Redcar Central with a train to catch. The first fill-up in a diesel Renault Clio after years of driving petrol is precisely the moment it occurs. With rain, a call coming in, or children to deal with, the hand just does what it has always done.
Coatham drivers: how to prevent petrol in a diesel next time
- Check the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on every forecourt. The label is what counts.
- In a motor you do not know, look inside the flap over the filler or at the cap before your first fill: plenty of motors state the fuel type there.
- Label your key. In a house 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" out loud before you lift the nozzle off the petrol pump. It sounds daft and it works.
- Whilst you are thinking about something else, this is an easy mistake to make — so tuck the phone away.
- Add-on devices exist for motors without one, and some diesels come with a filler that won't take a petrol nozzle. Useful — but a safety net at best, never a reason to stop checking the label.
- Less petrol makes a weaker mix, so stop as soon as you realise — though remembering that the next step is unchanged. It is still not to start the vehicle.
Put petrol in a diesel around Coatham already?
The order of things is brief, then. Do not switch the ignition on, and do not fire it up. Ask the staff to help you push it away from the pump if you're still at the forecourt, whether that's BP or somewhere else. What went in, about how much, and if it's run: tell us those when you ring 0333 366 0103.
Say so if it was AdBlue instead of petrol: it is a separate issue, with its own page for Coatham, because AdBlue brings corrosion and deposits instead of lost lubrication.
What makes one Coatham petrol in a diesel task cost more than the next
A fair single price does not exist here: four situations, four separate tasks. Mostly, the cost shifts with which situation you are in. Where your car is matters too, and whether our van can safely reach it, after the ratio of petrol to what your tank holds.
Ahead of any quote, not after, we ask three questions: your fuel that went in, the amount, and if it's run. That is why. A range turns into a straight figure when the replies are in.
About Coatham, briefly
Coatham is a small coastal suburban area in North Yorkshire, situated near the towns of Redcar and Westfield. Coatham has a population of around 2595 people and is characterized by its predominance of terraced housing. Coatham sits at a low elevation of 9 metres above sea level, close to the nearby West Dyke area. Coatham is located approximately 22.9 miles from the city of Durham and 218.5 miles from London.
Fuel drain cover around Coatham and across North Yorkshire
Redcar, Westfield and West Dyke are among the spots around Coatham that the same teams work, answering petrol in diesel jobs across Coatham's TS postcode area. We drain where the vehicle is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the petrol pump around Coatham?
Nothing beats it: that is where you now are. Ring, and leave it turned off.