Should You Worry? Petrol in a Diesel Car in Rawcliffe
Far less than you probably are, if it hasn't been started. Everyone around Rawcliffe starts with "have I wrecked it?", and the honest answer is normally no: petrol left inside your tank of a diesel remains harmless until priming, cranking or driving pulls it into the fuel system. Keep it like that: leave the engine off then ring Petrol in Diesel. Keep reading for three things: the effect petrol has inside a diesel motor, the clues of how far it has spread, and the way to make sure you don't repeat it.
Petrol in a diesel: what does it do to the engine?
Two jobs fall to diesel on its route round a motor. Oiling comes before burning; it does both. Extremely fine gaps go into your injectors and your high-pressure pump, and just the diesel flowing through stops their surfaces grinding together.
Of these two tasks, petrol manages the first poorly and the second not at all. It is runnier than diesel and strips away the lubrication the system hinges on, so a pump running on a petrol blend is a pump wearing itself. And petrol is made to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That's where the knocking comes from.
Put those together and the shape of the issue is clear. Not contact but movement is what causes the damage. A tank with petrol in it is a fuel problem. After the pump has been running on that petrol, a mechanical issue has started: anything shed by a pump that is grinding is carried onward to the injectors with your fuel.
Petrol in a diesel around Rawcliffe: how serious is it? Four situations
Fuelled, and not started: nothing beats it. Being on a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With the petrol kept in that tank alone, it's emptied and purged right where it stands, and nothing more is needed.
A moment's running, or just the ignition on. Petrol has come out of your tank and got to the fuel filter and the fuel lines, because the system has been primed. Normally little more than draining, rinsing and seeing to the fuel filter, so still straightforward.
Those few miles driven were your pump running on fuel diluted by petrol the whole way. The work is the tank, your lines, your filter and clean fuel through the whole system, and how hard the vehicle was driven matters as much as how far. The school run to Rawcliffe Primary School is one matter. A run as far as Doncaster, under 15 miles away, is a very different task. So is any mileage on the M62, under a mile from Rawcliffe, where the engine has been running hard throughout.
Driven till it complained. Clattering, an uneven idle, smoke, a throttle that has gone soft. The fuel is not acting like diesel any more, and the engine is saying so. Leave it wherever it has stopped: a lay-by, a side street, the verge on The Green. What comes first is still the fuel drain and flush, and that sorts it out, with lasting damage very unusual if a car is stopped soon.
What Rawcliffe people get told about petrol in a diesel — and the stories in it
Myth: topping up to full with diesel makes it fine. It doesn't. A bigger tank of the same mix is all you get, because topping up removes nothing. The assumption behind that advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
If anything, the opposite holds. Myth: "A newer diesel can cope with a bit of petrol." Protection counts more on newer diesels, not less, because their fuel passes through more precise parts at higher pressure.
This is the one that catches drivers. Myth: "If it starts and drives, there is no damage done." Diesel in a petrol motor generally leaves a motor that will not run: the motorist stops, and so does the harm. A diesel fed petrol normally starts, idles and drives away as though nothing has happened, whilst the pump grinds. A running engine doesn't mean fine.
Myth: "Add some two-stroke oil and drive the car home." It is an old fix for a separate issue. What petrol has thinned stays diluted, and that petrol stays in that tank regardless.
"Drain it yourself and you are sorted" — a myth, because after it has been running some petrol lies in the fuel filter and lines, ready to go straight back through the pump on the next start. Besides, petrol cleared into a can by the road is truly risky.
How petrol ends up: petrol in a diesel
Nobody does it on purpose, and it is seldom carelessness. The forecourt makes it easy: the petrol nozzle is the narrower of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle generally won't go into a petrol car at all. So the mistake runs one way.
Routine and the car falling out of step is how it takes place. Courtesy car, hire car, or a vehicle that is brand new. One petrol and one diesel on the driveway of the same household. Your usual forecourt, its pumps now in a different order. Racing for a train outside the nearest station and fuelling up en route. Years of petrol vehicles behind you, a diesel Renault Megane in front of you on the forecourt for its first tank — that's when. Throw in a back seat full of children, a phone call or rain, and the hand takes over.
Rawcliffe motorists: how to avoid petrol in a diesel next time
- Check the pump, not the colour. In the UK unleaded handles are generally green and diesel black, but not on every forecourt. The label is what counts.
- Plenty of vehicles state the fuel type inside the filler flap or on the cap, and so check there on your first fill in a car you do not know.
- Good intentions do less than a sticker or a fob in a bright colour on the diesel's key when a house has one of each. So label it.
- Before the nozzle comes off the petrol pump the first time you fill a hired or new motor, say "diesel" aloud. Daft, yes, but it does the trick.
- Whilst you are thinking about something else, this is an easy mistake to make — so tuck your phone away.
- Some diesels come with a filler designed to reject a petrol nozzle, and devices you can add exist for vehicles without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop checking the pump.
- Less petrol makes a thinner blend, so stop the moment you realise — though remembering that your next stage is unchanged. It's still not to fire it up.
Already put petrol in a diesel around Rawcliffe?
Then the order of things is short. Don't switch the ignition on, and don't start it. Ask the staff to help you push it away from the petrol pump if you're still on the forecourt, whether that's the nearest petrol station or anywhere else. Then phone 0333 366 0103 and tell us what went in, roughly how much, and if it's run.
Corrosion and deposits are the trouble with AdBlue, where petrol brings lost protection. So if it was AdBlue, say so — and read its own Rawcliffe page.
Why one petrol in a diesel task around Rawcliffe costs more than another
Four different jobs sit behind the four scenarios above — which is why there is no fair single price. Which of them you are in is chiefly what moves your cost. Two things come after that: the petrol that got in as a proportion of what that tank holds, then the spot the car is in and whether a technician can reach it safely.
That's why we ask three queries before quoting rather than after: what got in, how much, and whether it's run. A range becomes a straight figure once those answers are in.
About Rawcliffe
Rawcliffe is a village situated on the riverside in the East Riding of Yorkshire, with a low elevation of around 8 metres. Rawcliffe lies near the villages of Newland and East Cowick, and is connected to Rawcliffe Bridge. Rawcliffe has a population of approximately 1580 people and predominantly features detached housing.
Across East Riding of Yorkshire and in Rawcliffe: fuel drain cover
Our teams answering petrol in diesel calls in Rawcliffe, in the DN postcode area, also work the spots around it, Newland, Rawcliffe Bridge and East Cowick included. Our engineers drain where the car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
At the petrol pump around Rawcliffe, right now?
The best place there is, then — that's where you are. Call, and keep it switched off.