Petrol in a Diesel Car in Edge Hill: How Worried Should You Be?
Less than you probably are, provided it hasn't been started. "Have I ruined it?" is the first thing anyone in Edge Hill asks, and the honest answer is usually no, because petrol resting in a diesel tank hurts nothing until it's drawn through your fuel system — by ignition priming, by your starter, or by being driven. To keep the vehicle that way, ring Petrol in Diesel and leave your engine switched off. Below, you will find what petrol really does inside a diesel, how far it may have got, and how to stop it happening to you a second time.
What petrol in a diesel does to your engine
Two tasks fall to diesel on its journey through a motor. Before it burns, it lubricates — then it combusts. Built to extremely fine tolerances, the fuel injectors and your pump rely on your diesel flowing through them to stop their surfaces wearing against one another.
Poorly at the first, not at all at the second: that's petrol. It's runnier than diesel and takes away the lubrication the system rests on, and so a pump running on a petrol mixture is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That is where the rattling comes from.
Combined, those leave the shape of the issue plain. Not contact but movement is what causes the harm. All a tank with petrol in it amounts to is a fuel fault. Whatever a worn pump sheds goes on, carried by your fuel, into your injectors further along, which is why a pump that has worked on the petrol is where a mechanical issue begins.
Four situations our engineers see in Edge Hill: how bad is petrol in a diesel?
Filled but never started — the best it gets. The petrol is in that tank and only your tank, and the task is a drain and a flush where the vehicle stands. This is the one situation that can only truly take place at a forecourt, as anywhere else the car has been driven to get there.
Started for a second, or just the ignition on. Once primed, your system has pulled petrol from the tank up to your filter and the fuel lines. Drain, flush, see to the filter: still usually straightforward.
Your pump now spent a couple of miles on diluted fuel — that is what driving it meant. Miles is only half of that; how hard it was driven counts equally. Either way the work runs to the tank, your lines, the filter and fresh fuel through the entire system. On the school run to St Anne's Catholic Primary School, the distance is short. Any mileage on the M62, under 3 miles from Edge Hill, means the engine working hard throughout, and a run to Liverpool, under 3 miles away, makes a very different job as well.
Driven on till it protested — rattling, smoke, an uneven idle, a soft throttle. The motor is telling you the fuel is no longer behaving like diesel. Pull up where you are — on the verge on Woodside Street, at the kerb, down a side road — and do not move it again. A vehicle pulled over soon very seldom has long-term damage, as the fuel drain and the flush, which still come first, sort it out.
Edge Hill people and that petrol in a diesel myths they hear
Myth: topping up to full with diesel makes it fine. It does not. Nothing comes out when you top up — that tank just holds more of the same mixture. The idea behind that guidance — that diesel fuel systems accept petrol by percentage — is wrong.
"Current diesels can handle a little petrol" — a myth, and nearer the reverse. Lubrication counts more on modern diesels, not less, since their fuel passes through finer parts at higher pressure.
This is the one that catches motorists. Myth: "If it starts and drives, there's no harm done." Diesel in a petrol motor generally leaves a motor that won't run: the motorist stops, and so does the harm. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile your pump grinds. A running engine doesn't mean fine.
Myth: "Add some two-stroke oil and drive the car home." It's an outdated workaround for a separate issue. It doesn't put back what petrol has diluted, and that petrol is still in that tank later on.
Myth: "Drain your tank yourself and you are sorted." After the engine has been run, some of that petrol is no longer in the tank: it is in the fuel filter and the lines, and it goes right back through the pump at the next start. Emptying petrol into a can by the kerbside is also really hazardous.
How does petrol in a diesel happen?
It's seldom carelessness, and no one does it on purpose. The petrol nozzle is the narrower of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally won't go into a petrol motor at all. The forecourt makes it easy, and the error runs one way.
When routine and the vehicle stop matching, it occurs. Any vehicle that's new to you — a hire car, on loan as a courtesy car, or just bought. Two cars on one drive, one petrol, one diesel. Your usual forecourt, its pumps suddenly in a different order. A rushed fill on the way to the nearest station with a train to catch. Precisely the moment it happens: after years of driving petrol, someone fills a diesel Renault Clio for the first time. The hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
Next time you fill up around Edge Hill: preventing petrol in a diesel
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most usually do. Read the pump's label; the colour is just a clue.
- Check the filler flap. Many cars state the fuel type inside the flap or on the cap. Look at it on your first fill in a vehicle you don't know.
- Good intentions count for less than a sticker or a fob in a vivid colour on the diesel's key if a household has one of each. So mark it.
- It sounds silly and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the pump.
- Thinking about something else is when this becomes an easy mistake to make, so tuck your phone away and keep your mind on the petrol pump.
- Some diesels have a filler built to reject a petrol nozzle, and devices you can add exist for motors without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop reading the pump.
- Less petrol makes a weaker mix, so stop the moment you notice — though remembering that the next step is unchanged. It's still not to fire it up.
Put petrol in a diesel in Edge Hill already?
Then the order of things is brief. Don't switch your ignition on, and don't fire it up. Ask the attendants to help you push it away from the petrol pump if you're still on the forecourt, whether that's Shell or somewhere else. Then call 0333 366 0103 and tell us what was put in, about how much, and whether it's run.
Say so if it was AdBlue rather than petrol: it's a different problem, with its own page for Edge Hill, since AdBlue brings corrosion and deposits rather than lost protection.
One petrol in a diesel task around Edge Hill costs more than another. Why?
Four separate tasks sit behind the four scenarios above — which is why there is no honest single price. Mostly, the cost moves with which one you are in. The ratio matters next, meaning how much of your tank is petrol, and then the position of your car and whether getting to it is safe for a technician.
That's why our engineers ask three queries before quoting instead of after: what got in, how much, and whether it's run. Those answers are what turn a range into one firm number.
About Edge Hill, for a moment
Edge Hill is a suburban area in Merseyside, situated close to the city of Liverpool and overlooking the coastal plain of the Irish Sea. Edge Hill sits at an elevation of 61 metres, with its terraced housing stock characteristic of the area's architectural heritage. Edge Hill is bordered by other Liverpool suburbs, including Kensington and Princes Park, and remains a densely populated residential community with a population of around 8633 people.
Edge Hill and Merseyside: where our fuel drain cover runs
Our teams answering petrol in diesel calls around Edge Hill, in the L postcode area, also work the places around it, Kensington, Elm Park and Princes Park included. The vehicle doesn't need to come to us: we drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
In Edge Hill and still at the pump?
Then, you couldn't be in a better position. Keep it off. Call.