Petrol in a Diesel Car in Wellington Hill: How Worried Should You Be?
Not started? Then less anxious than you likely are. Everyone around Wellington Hill starts with "have I wrecked it?", and the fair answer is generally no: petrol resting in your tank of any diesel stays harmless until priming, cranking or driving draws it into your fuel system. Leave the engine off and call Petrol in Diesel — that is how you keep it that way. The rest of this page covers what petrol really does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you again.
The engine and petrol in a diesel: what happens
Diesel has two tasks on its way through an engine. Oiling comes before burning; it does both. What stops the surfaces inside the high-pressure pump and the fuel injectors from grinding against each other is your diesel passing through them — they are designed to extremely fine clearances.
The second task petrol does not do at all, and the first it does poorly. Being less viscous than diesel, petrol strips away the protection a fuel system needs, so a pump on the blend wearing itself. It is also made to resist igniting under compression — the reverse of what a diesel needs — which is where you get the rattling.
Together, those make the shape of the trouble clear. It is circulation that does the damage, not contact. Petrol in the tank is a fuel problem. After the pump has been running on that petrol, a mechanical fault has started: whatever is shed by a pump that is wearing down is carried downstream to the fuel injectors with your fuel.
Four scenarios our technicians see in Wellington Hill: how serious is petrol in a diesel?
The best case there can be: filled up, never started. Being at a forecourt is what makes this the case: elsewhere, your car has been driven there to begin with. With that petrol held in your tank alone, it is cleared and flushed right where it stands, and nothing more is needed.
A brief spell of running, or merely the ignition on. Petrol has come out of your tank and got to the filter and the lines, since your system has been bled. Drain, flush, deal with your filter: still usually easy.
Those few miles on the road were the pump running on fuel diluted by petrol throughout. Miles is only half of that; how hard it was driven matters just as much. Either way this work runs to the tank, your lines, the filter and fresh fuel through the whole system. Driving the kids to Whinmoor St Paul's Church of England Primary School is one kind of trip. A run as far as Leeds, under 5 miles away, is a very different job. So is any miles on the M1, under 5 miles from Wellington Hill, where the motor has been labouring hard throughout.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone uneven. What you are hearing is the motor reporting fuel that no longer behaves like diesel. Pull up on the spot — on the verge on Whinmoor Gardens, at the kerb, down a side road — and do not move it again. A car pulled over quickly very seldom has long-term damage, since the drain and the flush, which still come first, sort it out.
Myths Wellington Hill 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 is removed by topping up — you are left with a fuller tank, still the same mixture. Percentage is not how a diesel fuel system tolerates petrol, however much that guidance assumes.
Not so: a current diesel copes with a bit of petrol. Rather, the opposite. At higher pressure, through smaller components: that's how a current diesel handles its fuel, and so the lubrication matters for more, not less.
Myth: "If it starts and drives, there's no harm done." This is the one that catches motorists. The motorist of a petrol motor fed diesel usually stops, because it will not run, and the damage stops with them. A diesel fed petrol normally starts, idles and drives away as though nothing has happened, while your pump wears. Running is not the same as fine.
An outdated fix for a distinct fault lies behind this one. Myth: "Add some two-stroke oil and drive the car home." The petrol is still in that tank after that, and what it has thinned isn't put back.
"Drain it yourself and you're sorted" — a myth, because after it has been running some petrol sits in the fuel filter and lines, ready to go right back through your pump at the next start. Also, a can of petrol filled at the roadside is genuinely dangerous.
How does petrol in a diesel happen?
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 is how the forecourt makes it easy.
It happens when routine and the vehicle stop matching. Hire cars, courtesy cars, and cars that are new to you. One petrol and one diesel on the drive of the same household. A well-known forecourt with the pumps in a different order. A train to catch, and a hurried fill on the way to Cross Gates. A new-to-you diesel Volkswagen Golf, its first fuelling, and a motorist used to petrol: exactly when it occurs. The hand repeats what it has always done when you add rain, a phone call or a back seat full of kids.
How to prevent petrol in a diesel at your next fill-up around Wellington Hill
- Check the petrol pump, not the colour. In the UK unleaded handles are normally green and diesel black, yet not on every forecourt. The label is what counts.
- The first fill in a strange car is the time to check your filler flap — on it, or on the cap, many vehicles state which fuel to use.
- A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, for a house with one of each.
- "Diesel", out loud, before you pick up the nozzle — each time a new or hired car gets its first tank. It sounds daft. It does the trick.
- Mistakes like this are easy to make whilst your mind is on something else, and so the phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to reject a petrol nozzle, and aftermarket devices are available for the rest. Count it as a safety net, and keep checking the pump.
- Spotting it halfway? Stop there and then. A thinner blend results from less petrol inside that tank, yet the next step remains the same: don't start it.
Put petrol in a diesel in Wellington Hill already?
Short and simple, then, is the order of things. Leave it unstarted, with your ignition off as well. Ask the attendants to help you push it clear of the pump if you're still at the forecourt, whether that's Euro Garages or somewhere else. Next, 0333 366 0103. We will ask what got in, about how much, and if it's been run.
Corrosion and deposits are the issue with AdBlue, where petrol means lost protection. So if it was AdBlue, say so — and see its own Wellington Hill page.
What makes one Wellington Hill petrol in a diesel task cost more than the next
An honest single quote doesn't exist here: four situations, four separate jobs. Mostly, your cost moves with which situation you're in. The proportion counts next, meaning how much of that tank is petrol, and then the position of the vehicle and whether reaching it is safe for a van.
That is why our engineers ask three queries before quoting instead of after: what went in, how much, and whether it's run. Given those answers, there is a straight figure instead of a range.
About Wellington Hill itself
Wellington Hill is a suburban area in West Yorkshire, situated approximately 4.4 miles from Leeds and 170.7 miles from London. Wellington Hill sits at an elevation of 136 metres, characterised by its predominantly semi-detached housing stock. Wellington Hill is located near other residential areas such as Monkswood, Seacroft, and Whinmoor, and has a population of around 2815 residents. Wellington Hill forms part of the wider Leeds urban area, with the city centre within easy reach.
Across West Yorkshire and in Wellington Hill: fuel drain cover
Petrol in diesel call-outs around Wellington Hill — part of the LS postcode area — go to vans that likewise cover the locations about it, Monkswood, Seacroft and Whinmoor included. The car does not need to move to us: our technicians drain on a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Wellington Hill: still at the petrol pump?
Then you're in the best place there is. Call, and keep it turned off.