Should You Worry? Petrol in a Diesel Car in Westonwharf
Unstarted? Then less anxious than you probably feel. Until your ignition primes the pump, the starter turns, or the car is driven, petrol in a diesel tank simply rests there and does no harm. Which makes the truthful reply to that first Westonwharf question — "have I wrecked it?" — normally no. Keep it like that: leave the motor off and phone Petrol in Diesel. The rest of this page covers what petrol really does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you a second time.
Inside your engine: what petrol in a diesel really does
Two jobs fall to diesel on its journey round a motor. It protects to begin with, and after that does it burn. The high-pressure fuel pump and your injectors are made to very fine gaps, and your diesel passing through them is what stops those surfaces from wearing down against one another.
The second task petrol does not do at all, and the first it does badly. The knocking comes from petrol being made not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips away the protection the system rests on, and any pump running on that blend is wearing itself.
The shape of the trouble is plain once you put those together. It is movement that causes the damage, not contact. Petrol in a tank is a fuel fault. The start of a mechanical problem is a pump that has been running on that petrol — and whatever a worn pump sheds travels on with the fuel to the injectors downstream.
Westonwharf, petrol in a diesel: four cases, from mild to major
Filled up, and not started: nothing beats it. Only the tank has petrol in it, so the job is clearing your tank and purging the system where the car stands. This situation can only truly happen on a forecourt: anywhere else, the car got there by being driven.
The ignition switched on, or a short start. With your system primed, the lines and filter already hold petrol that has come from that tank. Usually little more than draining, flushing and sorting the fuel filter, so still straightforward.
Your pump has worked a few miles on diluted fuel — that's what driving the car does. How hard the vehicle was driven counts as much as how far, and this work takes in that tank, the lines, the fuel filter and fresh fuel through the entire circuit. Short trips, such as the school run to Weston Lullingfields Church of England Primary School and Nursery, are one matter. Driving as far as Wrexham, under 25 miles away, makes a very different task — as does any mileage on the M54, under 25 miles from Westonwharf, with the engine working hard all the way.
Driven until it complained. Clattering, a lumpy idle, smoke, a throttle that has gone soft. That is your motor telling you its fuel no longer is behaving like diesel. Leave it where it stops: a lay-by, a side street, the verge on Oakley Close. What comes first is still the fuel drain and flush-through, and that deals with it, with permanent damage very uncommon if a car is stopped soon.
What Westonwharf drivers get told about petrol in a diesel — and the stories in it
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. A fuller tank of the same mix is all you get, because topping up takes out nothing. Percentage is not how a diesel fuel system tolerates petrol, however much that advice assumes.
If anything, the reverse is true. Myth: "A newer diesel can cope with a bit of petrol." Lubrication counts more on modern diesels, not less, because their fuel passes through more precise components at higher pressure.
Myth: "If it starts and drives, there's no harm done." This is the one that catches motorists. Diesel in a petrol motor usually means a motor that won't run: the driver stops, and so does the damage. Feed petrol to a diesel and it generally starts, idles and pulls away like nothing happened — all while its pump is wearing. Running does not mean fine.
Not so: a two-stroke additive lets you to drive home. It is an old fix, meant for another fault. None of what petrol diluted gets put back by it — and afterwards, the tank still contains the petrol.
If the motor has been run, part of that petrol is in the fuel filter and the fuel lines, not the tank — and your next start sends it straight back through your pump. So the myth "drain the tank yourself and you are sorted" doesn't hold. On top of that, petrol emptied into a can by the road is genuinely hazardous.
How does petrol in a diesel take place?
On purpose? Never. Through carelessness? Rarely, if ever. The forecourt makes it easy: the petrol nozzle is the slimmer of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle mostly will not go into a petrol motor at all. So the error runs one way.
The moment habit stops matching the car is the moment it happens. Courtesy car, hire car, or a car that's new. Two cars on one driveway, one petrol, one diesel. The pumps in a different order on a well-known forecourt. Racing for a train outside Yorton and fuelling up en route. The first fill-up in a diesel Volkswagen Golf after years of driving petrol is precisely the moment it takes place. Your hand repeats what it has always done when you add rain, a phone call or a back seat full of kids.
Next time you fill up around Westonwharf: preventing petrol in a diesel
- Check the pump, not the colour. In the UK unleaded handles are normally green and diesel black, yet not on each forecourt. The label is what counts.
- Many cars state the fuel type inside your filler flap or on the cap, so check it on the first fill in a motor you don't know.
- Label your key. In a home with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of intending to remember.
- Before the nozzle comes off the pump the first time you fuel a hired or new vehicle, say "diesel" out loud. Silly, yes, yet it works.
- Mistakes like this are simple to make whilst your mind is on something else, so the phone goes away.
- Add-on devices exist for motors without one, and some diesels are built with a filler that won't take a petrol nozzle. Helpful — but a backstop at best, never a reason to stop checking the label.
- Less petrol makes a thinner mix, and so stop the moment you realise — while remembering that the next step is unchanged. It is still not to fire it up.
Put petrol in a diesel in Westonwharf already?
Short and simple, then, is the order of things. Starting it is out, and so is switching on the ignition. Still at the forecourt, at Shell or anywhere else? Ask the staff to help you roll it clear of the petrol pump. Then call 0333 366 0103 and tell us what got in, roughly how much, and if it's run.
Corrosion and deposits form the trouble with AdBlue, where petrol brings lost lubrication. So if it was AdBlue, say so — and see its own Westonwharf page.
What makes one Westonwharf petrol in a diesel task cost more than the next
There's no fair single quote for this, since the four situations above are four separate tasks. Chiefly, your cost shifts with which one you are in. Where the car is matters too, and whether a van can safely get to it, after the ratio of petrol to what that tank holds.
What went in, how much, and if it's run — three questions our technicians ask before pricing, not after, for exactly that reason. Those answers are what turn a range into one firm number.
About Westonwharf
Westonwharf is a small hamlet in Shropshire, situated inland at an elevation of 78 metres, and is located near other local places such as Westoncommon and Weston Lullingfields. Westonwharf sits in a rural area, with the nearest city being Wrexham, approximately 16 miles away. Westonwharf has a population of around 522 people, predominantly living in detached houses. Westonwharf is also relatively distant from London, at around 147 miles away.
Fuel drain cover across Shropshire, Westonwharf included
Westoncommon, Weston Lullingfields and Stanwardine in the Fields are among the locations around Westonwharf that the same vans work, answering petrol in diesel call-outs across Westonwharf's SY postcode area. You need not move your vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots we drain.
Still at the pump around Westonwharf?
Then you are in the best spot there can be. Leave the car turned off, and ring.