How Worried Should You Be? Petrol in a Diesel Car in Linthwaite
Likely less than you already are — provided nobody has started it. Petrol sitting in a diesel tank does nothing to the engine until something pulls it through the system — the ignition priming your pump, your starter, or driving on its own. So the honest answer to the first question everyone in Linthwaite asks, "have I ruined it?", is usually no. To keep the vehicle like that, ring Petrol in Diesel then leave your motor switched off. Below, you will find what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you again.
The engine and petrol in a diesel: what happens
Two tasks fall to diesel on its route round a motor. Lubricating comes before burning; it does both. What stops the surfaces inside your high-pressure pump and your injectors from grinding against each other is the diesel flowing through them — they are built to extremely fine gaps.
The second job petrol doesn't do at all, and the first it does poorly. A pump working on a petrol mix is wearing itself out, because petrol is runnier than diesel and takes away the protection the fuel system relies on. Petrol is also made to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that's where the rattling comes.
Taken together, they make clear what shape the problem takes. Not contact but circulation is what causes the harm. All a tank with petrol in it amounts to is a fuel problem. The beginning of a mechanical one is a pump that has been running on that petrol — and whatever a worn pump sheds moves on with the fuel to the injectors downstream.
How serious is petrol in a diesel? Four scenarios our engineers see around Linthwaite
Filled up, and never started: nothing beats it. Just that tank has petrol in it, and so the task is draining your tank and flushing your system where the vehicle stands. This scenario can only truly occur at a forecourt: anywhere else, your car got there by being driven.
A brief spell of running, or merely your ignition on. The system has been bled, so petrol has left the tank and reached your filter and the fuel lines. That's normally still an easy job — a drain, a flush, and your filter seen to.
Your pump has worked a few miles on weakened fuel — that's what driving the car does. How hard the car was driven matters as much as how far, and this work takes in the tank, the fuel lines, the filter and clean fuel through the entire circuit. Driving the children to Linthwaite Clough Primary School is one kind of trip. Very different a second time: a run to Bradford, under 15 miles away, or some mileage on the M62, under 3 miles from Linthwaite, where the motor kept working hard.
Driven until it complained. Rattling, a lumpy idle, smoke, a throttle that has gone soft. What you are hearing is your engine reporting fuel that no longer behaves like diesel. Pull up wherever you are — the verge on Hoyle House Fold, a lay-by, a side street — then leave it there. What goes first is still the fuel drain and flush, and that sorts it out, with lasting damage very unusual if a vehicle is stopped quickly.
Stories Linthwaite motorists 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 is removed by topping up — you are left with a bigger tank, still the same mixture. The assumption behind that guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
"Newer diesels can handle a little petrol" — a myth, and nearer the reverse. Protection matters more on modern diesels, not less, since their fuel passes through smaller components at higher pressure.
"It starts, it drives, and so no harm done" — the myth that catches most drivers 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. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump grinds. A running engine doesn't mean fine.
Myth: "Add some two-stroke oil and drive the car home." It's an old fix for a distinct fault. None of what petrol thinned gets put back by it — and later, your tank still holds that petrol.
Myth: "Drain that tank yourself and you are sorted." After the engine has been run, some of the petrol is no longer in the tank: it's in the filter and the fuel lines, and it goes right back through your pump on the next start. And, a can of petrol filled by the roadside is truly hazardous.
How petrol ends up: petrol in a diesel
It is seldom carelessness, and no one does it on purpose. One way only, because of the nozzles: the slimmer petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one mostly will not fit a petrol vehicle. That's how the forecourt makes it simple.
Habit and the car getting out of step is when it occurs. Hire cars, courtesy cars, and motors that are new to you. Two cars on one driveway, one petrol, one diesel. The pumps in a different order on a familiar forecourt. A hurried fill en route to Slaithwaite with a train to catch. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is exactly the moment it takes place. Throw in rain, a phone call or a back seat full of children, and your hand does what it has always done.
Preventing petrol in a diesel next time you fill up around Linthwaite
- Read the pump, not the colour. In the UK unleaded handles are normally green and diesel black, but not on each forecourt. The label is what counts.
- Check your filler flap. Plenty of vehicles state the fuel inside the flap or on the cap. Look at it on your first fill in any motor you don't know.
- One of each in the home? Mark your key to the diesel — a coloured fob, a sticker — because intending to remember is not enough.
- It sounds daft and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump.
- Thinking about something else is when this becomes an easy mistake to make, so tuck the phone away then keep your mind on the petrol pump.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to refuse a petrol nozzle, and add-on devices are available for the rest. Treat it as a backstop, then keep checking the petrol pump.
- Stop the moment you realise. Less petrol inside your tank means a thinner mix. It doesn't change what to do next, which is still not to fire it up.
Already put petrol in a diesel in Linthwaite?
Then the order of things is short. Leave it unstarted, with your ignition off as well. Yet at the forecourt, at the nearest petrol station or anywhere else? Ask the attendants to help you roll it clear of the petrol pump. Then phone 0333 366 0103 and tell us what was put in, roughly how much, and if it has run.
Say so if it was AdBlue instead of petrol: it is a separate problem, with its own page for Linthwaite, since AdBlue brings corrosion and deposits rather than lost protection.
Why one petrol in a diesel job in Linthwaite costs more than another
The four situations above are four separate tasks, so no single price for this would be fair. Chiefly, your cost moves with which one you are in. Two things follow that: the petrol that went in as a share of what that tank holds, then the place the car is in and whether a van can reach it safely.
Ahead of any quote, not after, come three queries: your fuel that was put in, its amount, and whether it has run. That's why. A range becomes a straight figure when those replies are in.
About Linthwaite, briefly
Linthwaite is a village in West Yorkshire, situated on the banks of the River Colne. Linthwaite sits at an elevation of 131 metres, with the surrounding landscape characterised by the Pennine hills. Linthwaite is located near several smaller communities, including Lower Clough, Height, and Lower Wellhouse, and is approximately 12 miles from the city of Bradford. Linthwaite has a population of around 2096 people, predominantly living in terraced housing.
Linthwaite and West Yorkshire: where our fuel drain cover reaches
Petrol in diesel call-outs in Linthwaite — part of the HD postcode area — go to vans that also cover the spots around it, Lower Clough, Height and Lower Wellhouse among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all places our technicians drain, and the car doesn't need to come to us.
Still at the pump around Linthwaite?
Then you are in the best spot there can be. Phone, and leave it switched off.