Whitelea Grange: Petrol in a Diesel Car? How Worried to Be
Not started? Then less anxious than you probably feel. Everyone in Whitelea Grange begins with "have I wrecked it?", and the honest answer is usually no: petrol resting inside the tank of any diesel remains harmless until priming, cranking or driving draws it into the fuel system. Leave the motor off then call Petrol in Diesel — that keeps it like that. The remainder of this page sets out what petrol actually does to a diesel, how to tell how far it has got, and how to make sure it doesn't happen to you again.
What petrol in a diesel does to the engine
Passing through a motor, diesel does two things at the same time. It lubricates first, and after that does it burn. Extremely fine gaps are built into the fuel injectors and the high-pressure pump, and just the diesel flowing through stops those surfaces grinding together.
Poorly at the first, not at all at the second: that is petrol. A pump working on a petrol mix is wearing itself out, since petrol is thinner than diesel and takes away the protection the fuel system relies on. Petrol is also designed to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that is where the clattering starts.
The shape of the trouble is plain when you put those together. Contact doesn't do the damage — circulation does. Petrol in the tank is a fuel issue. Once your pump has been labouring on that petrol, a mechanical problem has started: whatever is shed by a pump that is wearing is carried onward to the fuel injectors with the fuel.
Petrol in a diesel in Whitelea Grange: how bad is it? Four cases
Filled up, never started. The best case there is. The petrol is in the tank and just your tank, and the task is a drain and a flush where the car stands. This is the one situation that can only truly occur at a forecourt, because anywhere else the vehicle has been driven to get there.
A moment's running, or just your ignition on. Once primed, the fuel system has pulled petrol out of that tank up to the filter and your lines. Drain, flush, deal with the fuel filter: still normally easy.
Driven a couple of miles. Now the pump has spent those miles running on weakened fuel. Miles is only half of it; how hard it was driven counts just as much. Either way this work includes your tank, the fuel lines, the fuel filter and clean fuel through the whole system. The school run to Hareside Primary School is one matter. Any miles on the A167(M), under 10 miles from Whitelea Grange, means your engine has worked hard throughout, and a run to Newcastle upon Tyne, under 10 miles away, is a very different job too.
Knocking, an uneven idle, smoke, a throttle gone soft: driven until it complained. That's the motor telling you its fuel has stopped acting like diesel. Stop wherever you are — the verge on Harnham Grove, a lay-by, a side street — and leave the vehicle where it is. The drain and flush-through still come first, and they take care of it: if a car is stopped quickly, permanent damage is very uncommon.
Whitelea Grange motorists and the petrol in a diesel stories they hear
False: topping up to full with diesel makes it fine. It does not. A bigger tank of the same mixture is all it gives, since topping up removes nothing. A diesel fuel system does not accept petrol by percentage in the way that advice presumes.
Not so: a modern diesel copes with a bit of petrol. Rather, the reverse. A modern diesel runs its fuel through more precise parts at higher pressure, which makes the protection count more, not less.
Myth: "If it starts and drives, there's no damage done." This is the one that fools drivers. Feed diesel to a petrol motor and it usually won't run, so the motorist stops — and the harm stops with them. While the pump wears, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. Fine and running are not the same thing.
An old workaround for a different problem is behind this one. Myth: "Add some two-stroke oil and drive it home." It does not put back what petrol has weakened, and the petrol is still in your tank later on.
The next start draws petrol back round your pump out of the fuel lines and the fuel filter, where some of it sits after the engine has run. That is why draining your tank yourself does not leave you sorted — a myth. Emptying petrol into a can by the roadside is also truly dangerous.
How does petrol in a diesel happen?
No one does it on purpose, and it is seldom carelessness. The forecourt makes it simple: the petrol nozzle is the narrower of the two, and it slides into a diesel filler with almost no resistance, while a diesel nozzle generally won't go into a petrol car at all. So the error runs one way.
Routine and the vehicle falling out of step is how it takes place. Hire cars, courtesy cars, and cars that are new to you. A household with one petrol and one diesel on the drive. A well-known forecourt with the pumps in a different order. A rushed fill en route to Cramlington with a train to catch. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it takes place. Add rain, a phone call or a back seat full of children, and your hand does what it has always done.
How to prevent petrol in a diesel at your next fill-up in Whitelea Grange
- 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 hint.
- Inspect the filler flap. Many cars state the fuel inside the flap or on the cap. Look at it on your first fill in a car you do not know.
- One of each in the household? Mark your key to your diesel — a coloured fob, a sticker — because intending to remember isn't enough.
- It seems silly and it does the trick: on the first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the pump.
- Tuck the phone away. This is an easy mistake to make while you are thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to refuse a petrol nozzle, and add-on devices exist for cars without one. They are a safety net, not a reason to stop reading the pump.
- Noticing it mid-fill? Stop at once. A thinner mix results from less petrol inside that tank, yet your next step remains the same: don't start the car.
Already put petrol in a diesel around Whitelea Grange?
Then the order of things is brief. Don't switch the ignition on, and don't fire it up. Ask the attendants to help you push it clear of the pump if you are still at the forecourt, whether that's Sainsbury's or somewhere else. Then ring 0333 366 0103 and tell us what got in, about how much, and if it's run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a separate problem — Whitelea Grange has a page all for it.
One petrol in a diesel task around Whitelea Grange costs more than another. Why?
The four situations above are four separate tasks, so no single quote for this would be fair. Mostly, the cost shifts with which one you are in. The ratio matters next, meaning how much of that tank is petrol, followed by the position of the vehicle and whether reaching it is safe for a van.
What got in, how much, and if it's run — three questions our technicians ask before costing, not after, for precisely that reason. Their answers are what change a range into one firm number.
About Whitelea Grange
Whitelea Grange is a suburban area located inland in Northumberland, sitting at an elevation of 71 metres and approximately 7.2 miles from Newcastle upon Tyne. Whitelea Grange forms part of the wider residential area around Newcastle, with nearby places including Hall Close Dale, Whitelea Dale, and Whitelea Glade. Whitelea Grange has a population of around 3907 people, predominantly living in terraced housing.
Whitelea Grange and Northumberland: where our fuel drain cover runs
Whitelea Grange sits in the NE postcode area, and our vans that answer petrol in diesel call-outs there work the spots around it as well — Hall Close Dale, Whitelea Dale and Whitelea Glade among them. No need to bring your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all places where we work.
Whitelea Grange: still at the pump?
No position is better: that's where you now are. Leave the vehicle turned off, then ring.