How Worried Should You Be? Petrol in a Diesel Car in Malvern Link
Likely less than you already are — provided nobody has started the car. "Have I wrecked it?" is the first thing everyone around Malvern Link asks, and the truthful answer is normally no, because petrol left in a diesel tank hurts nothing till it is drawn through your fuel system — by ignition priming, by the starter, or by being driven. Leave your engine off and call Petrol in Diesel — that keeps it that way. The remainder of this page explains what petrol actually 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 motor and petrol in a diesel: what happens
Passing through an engine, diesel is doing two things at once. It protects first, and after that does it burn. Your high-pressure pump and the injectors are designed to very fine tolerances, and the diesel passing through them is what stops those surfaces from grinding against one another.
Poorly at the first, not at all at the second: that's petrol. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, so a pump on that mixture to wear itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is why you get the rattling.
Taken together, they make clear the shape the issue takes. It is movement that does the harm, not contact. Petrol in the tank is a fuel problem. Once your pump has been labouring on that petrol, a mechanical fault has begun: anything shed by a pump that's wearing travels onward to the fuel injectors with the fuel.
Petrol in a diesel in Malvern Link: how serious is it? Four cases
Fuelled, and never started: nothing beats it. That petrol is inside your tank and only that tank, and the job is a drain and a flush where the vehicle sits. This is the one situation that can only really take place on a forecourt, as anywhere else the vehicle has been driven to get there.
Started for a moment, or only the ignition on. Petrol has come out of that tank and reached the filter and the fuel lines, because the fuel system has been bled. Usually little more than draining, purging and seeing to the fuel filter, so still easy.
Driven a couple of miles. Now your pump has spent these miles labouring on thinned fuel. How hard the vehicle was driven counts as much as how far, and the work covers the tank, your lines, the filter and clean fuel through the whole system. Driving the children to St Matthias Church of England Primary School is one sort of trip. Getting as far as Worcester, under 10 miles away, makes a very different job — as does any miles on the M5, under 5 miles from Malvern Link, with the engine labouring hard all the way.
Driven till it complained. Knocking, a lumpy idle, smoke, a throttle that has gone soft. What you are hearing is your engine signalling fuel that no longer acts like diesel. Whether it's the verge on Victoria Park Road, a lay-by or a side street, stop where you are and leave it. What comes first is still the drain and flush, and that deals with it, with lasting damage very unusual when a vehicle is stopped soon.
Myths Malvern Link drivers hear about petrol in a diesel
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Topping up takes out nothing; it gives you a bigger tank of the same mixture. The idea behind the advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: "A current diesel can cope with a bit of petrol." If anything, the opposite. Protection matters more on newer diesels, not less, since their fuel passes through more precise parts at higher pressure.
The myth that catches motorists off guard: if it starts and drives, it must be unharmed. Feed diesel to a petrol engine and it generally won't run, so the motorist stops — and the harm stops with them. A diesel fed petrol normally starts, idles and drives away as if nothing has happened, whilst the pump wears. Running isn't the same as fine.
An old fix for a distinct issue lies behind this one. Myth: "Add some two-stroke oil and drive it home." It does not put back what petrol has diluted, and the petrol is still inside the tank later on.
"Drain it yourself and you are sorted" — a myth, since after it's been running some petrol lies in your filter and lines, waiting to go right back through the pump at your next start. Also, a can of petrol drained by the roadside is truly dangerous.
Petrol in a diesel: how does it happen?
On purpose? Never. Through carelessness? Seldom, if ever. The forecourt makes it easy: the petrol nozzle is the smaller of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle generally will not go into a petrol vehicle at all. So the error runs one way.
It takes place when routine and the vehicle stop matching. Courtesy car, hire car, or a car that is new. A household with one petrol and one diesel on the driveway. The pumps in a different order on a familiar forecourt. A train to catch, and a hurried fill en route to the nearest station. Exactly the moment it occurs: after years of driving petrol, a driver fills a diesel Volkswagen Passat for the first time. With rain, a call coming in, or a car full of children to deal with, your hand simply does what it always has.
Malvern Link people: how to prevent petrol in a diesel next time
- Check the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, but not on each forecourt. The label is what counts.
- Inspect your filler flap. Plenty of motors state the fuel inside the flap or on the cap. Look at it on the first fill in a motor you don't know.
- Good intentions count for less than a sticker or a fob in a bright colour on your diesel's key when a home has one of each. So label it.
- It seems silly and it works: on your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump.
- Thinking about something else is when this becomes an easy mistake to make, and so put the phone away and keep your mind on the pump.
- Add-on devices exist for vehicles without one, and some diesels are built with a filler that will not take a petrol nozzle. Useful — but a safety net only, never a reason to stop checking the label.
- The moment you realise, stop: less petrol in the tank makes a thinner mixture. What to do next does not change, though — still do not start the car.
Malvern Link: already put petrol in a diesel?
Then the order of things is short. Don't crank it, and do not switch your ignition on. If you're still at the forecourt — Texaco or anywhere else — ask the staff to help you roll the vehicle clear of the petrol pump. Next, 0333 366 0103. We will ask what got in, about how much, and if it has been run.
Corrosion and deposits are the problem with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and read its own Malvern Link page.
What makes one Malvern Link petrol in a diesel job cost more than the next
A fair single price does not exist here: four scenarios, four separate tasks. Mostly, the cost shifts with which one you are in. Beyond that it's the share — how much petrol went in against how much the tank holds — and after that where your car is and whether a technician can reach it safely.
What was put in, how much, and if it's run — three questions our engineers ask before quoting, not after, for exactly that reason. Their replies are what change a range into one firm number.
About Malvern Link, for a moment
Malvern Link is a suburban area in Worcestershire, situated near the foot of the Malvern Hills, with Upper Howsell and Lower Howsell to the south. Malvern Link has a mix of housing types, but semi-detached homes are predominant, and the area is about 6 miles from Worcester. Malvern Link is relatively low-lying, at an elevation of around 58 metres, and is part of the larger Malvern urban area. Malvern Link is also within commuting distance of larger cities, being around 103 miles from London.
Fuel drain cover across Worcestershire, Malvern Link included
Malvern Link sits in the WR postcode area, and our teams that answer petrol in diesel jobs there work the places around it as well — Upper Howsell, Lower Howsell and North Malvern among them. No need to move the car to us. Forecourts, supermarket car parks, lay-bys and your own drive are all spots we drain.
At the pump in Malvern Link, still?
Then, you couldn't be in a better position. Keep the car turned off, and ring.