Shipley: Petrol in a Diesel Car? How Worried to Be
Not started? Then less worried than you likely are. Petrol sitting in a diesel tank does nothing to your motor till something draws it through the system — the ignition priming your pump, your starter, or driving itself. So the fair answer to the first question everyone in Shipley asks, "have I wrecked it?", is normally no. To leave it like that, call Petrol in Diesel and leave your motor alone. Below, this page sets out what petrol really does inside a diesel, how far it might have gone, and how to stop it happening to you a second time.
Inside the engine: what petrol in a diesel does
Diesel has two tasks on its way through an engine. It combusts, and before it combusts it lubricates. Your high-pressure pump and the fuel injectors are designed to very fine clearances, and the diesel passing through them is what keeps those surfaces from wearing against each other.
Of these two tasks, petrol manages the first badly and the second not at all. The rattling comes from petrol being made not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips away the protection the fuel system rests on, and any pump working on that mixture is wearing itself.
Put those together and the shape of the issue is plain. Contact doesn't do the harm — circulation does. All a tank with petrol in it amounts to is a fuel fault. The beginning of a mechanical problem is a pump that has been running on that petrol — and whatever a worn pump sheds travels on with your fuel to the injectors downstream.
Four situations our engineers see around Shipley: how bad is petrol in a diesel?
The best case there can be: filled up, never started. Just the tank has petrol in it, so the job is clearing that tank and flushing your system where the car sits. This situation can only truly happen at a forecourt: anywhere else, your car got there by being driven.
A brief spell of running, or merely your ignition on. Petrol has left your tank and got to the filter and the lines, since the fuel system has been primed. Still normally easy: drain, flush, and the fuel filter seen to.
Those few miles on the road were your pump running on fuel diluted by petrol throughout. Miles is only half of it; how hard it was driven matters equally. Either way this work includes your tank, the lines, the fuel filter and clean fuel through the whole circuit. The school run to Shipley CofE Primary School is one matter. Any mileage on the M606, under 5 miles from Shipley, means the motor has worked hard throughout, and a run to Bradford, under 5 miles away, is a very different task too.
Driven till it protested. Knocking, an uneven idle, smoke, a throttle that has gone soft. The fuel isn't behaving like diesel any more, and your engine is telling you. Whether it is the verge on New Kirkgate, a lay-by or a side street, stop there then leave it. The drain and flush-through still come first, and they take care of it: when a car is stopped quickly, permanent damage is very unusual.
Shipley drivers and the petrol in a diesel stories they hear
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Topping up takes out nothing; it gives you a bigger tank of the same mixture. The assumption behind that advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
If anything, the opposite holds. Myth: "A current diesel can cope with a bit of petrol." Lubrication counts 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 trips up most people than any other. Diesel in a petrol motor generally means a motor that won't run: the motorist stops, and so does the harm. While your pump wears, a diesel fed petrol normally starts, ticks over and drives away as if nothing has happened. A running engine doesn't mean fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a separate fault. The petrol is still inside the tank afterwards, and whatever it has thinned is not put back.
"Drain it yourself and you are sorted" — a myth, since after it has been running some petrol sits in the fuel filter and lines, waiting to go right back through your pump on your next start. On top of that, petrol drained into a can by the road is genuinely hazardous.
How does petrol in a diesel occur?
It's seldom carelessness, and nobody does it on purpose. The forecourt makes it simple: the petrol nozzle is the slimmer of the two, and it slides into a diesel filler with almost no resistance, while a diesel nozzle mostly won't go into a petrol motor at all. So the error runs one way.
When routine and the vehicle stop matching, it occurs. Hire cars, courtesy cars, and cars that are new to you. Households running one of each, petrol and diesel. The pumps in a different order on a familiar forecourt. Filling up in a rush en route to the nearest station, with a train to catch. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that's when. Throw in rain, a phone call or a back seat full of children, and the hand repeats what it has always done.
How to prevent petrol in a diesel at your next fill-up in Shipley
- Check the petrol pump, not the colour. In the UK unleaded handles are generally green and diesel black, yet not on every forecourt. The label is what counts.
- Check your filler flap. Many vehicles state the fuel inside the flap or on the cap. Look at it on your first fill in any car you do not know.
- One of each in the house? Label the key to the diesel — a coloured fob, a sticker — since meaning to remember is not enough.
- Before the nozzle leaves the pump the first time you fill a hired or new car, say "diesel" out loud. Silly, yes, yet it does the trick.
- Put 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 built to block a petrol nozzle, and add-on devices exist for motors without one. They are a safety net, not a reason to stop checking the pump.
- Spotting it halfway? Stop there and then. A weaker mix follows from less petrol inside your tank, yet your next stage remains the same: do not fire it up.
Shipley: already put petrol in a diesel?
In that case, there's just a short order of things. Do not fire it up, and do not switch the ignition on. Ask the attendants to help you push it away from the petrol pump if you are still on the forecourt, whether that is BP or anywhere else. Ring 0333 366 0103 next, with three answers — the fuel, the approximate quantity, and if it has run.
Corrosion and deposits form the issue with AdBlue, where petrol brings lost protection. So if it was AdBlue, say so — and see its own Shipley page.
What makes one Shipley petrol in a diesel job cost more than the next
Four different jobs sit behind the four scenarios above — which is why there's no fair single quote. Which of them you're in is mostly what moves your cost. After that it's the proportion — how much petrol was put in against how much your tank takes — and after that where your car is and whether a technician can get to it safely.
That's why our engineers ask three questions before quoting instead of after: what got in, how much, and whether it has run. A range turns into a straight figure when those answers are in.
About Shipley
Shipley is a town situated on the River Aire in West Yorkshire, with a mix of terraced housing and other residential areas. Shipley sits at an elevation of around 93 metres, close to the nearby city of Bradford. Shipley has a population of approximately 26,348 people and is near several other local places, including Windhill and Baildon. Shipley is located about 3.1 miles from Bradford and 175 miles from London.
Fuel drain cover around Shipley and across West Yorkshire
Petrol in diesel calls around Shipley — part of the BD postcode area — go to teams that likewise cover the spots around it, Windhill, Baildon Holmes and Baildon Wood Bottom among them. You need not move your car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all places where we work.
In Shipley and still at the pump?
The best place there is, then — that's where you are. Call, and keep it turned off.