How Worried Should You Be? Petrol in a Diesel Car in Weston
Probably less than you are now — as long as nobody has started the vehicle. "Have I wrecked it?" is the first thing everyone in Weston asks, and the honest answer is generally no, because petrol left in a diesel tank hurts nothing until it is dragged through the system — by ignition priming, by your starter, or by driving. To keep it like that, call Petrol in Diesel then leave the engine alone. Further down, you will find what petrol really does inside a diesel, how far it might have gone, and how to stop it happening to you a second time.
What petrol in a diesel does to the motor
On its way through an engine, diesel does two tasks. It protects to begin with, and only then does it burn. Designed to extremely fine gaps, the injectors and your pump rely on the diesel moving through them to keep their surfaces from wearing against one another.
The second task petrol does not do at all, and the first it does badly. Being less viscous than diesel, petrol strips away the lubrication a fuel system needs, so a pump running on that mixture to wear itself. It's also made to resist igniting under compression — the opposite of what a diesel needs — which is where you get the rattling.
Together, those leave the shape of the problem clear. Contact does not do the damage — movement does. Any tank with petrol in it is a fuel problem. The beginning of a mechanical one is a pump that has been labouring on that petrol — and whatever a worn pump sheds travels on with your fuel to the fuel injectors downstream.
Four situations our technicians see in Weston: how bad is petrol in a diesel?
The best case there is: filled up, not once started. Being at a forecourt is what makes this the case: elsewhere, your car has been driven there to begin with. With the petrol held in that tank alone, it's drained and cleaned right where it stands, and nothing more is needed.
A moment's running, or merely your ignition on. The fuel system has been bled, and so petrol has left the tank and got to the filter and the fuel lines. Normally nothing more than draining, flushing and seeing to the fuel filter, so still straightforward.
Those few miles driven were your pump working on fuel diluted by petrol throughout. How hard the car was driven counts as much as how far, and this work takes in that tank, the lines, the filter and clean fuel through the whole circuit. On the school run to Weston Primary School, the miles is short. A run as far as Chester, under 15 miles away, is a very different job. So is any miles on the M56, under 3 miles from Weston, where your engine has been running hard throughout.
Driven until it complained. Rattling, an uneven idle, smoke, a throttle that has gone soft. The engine is telling you your fuel is no longer acting like diesel. Leave it where it has stopped: a lay-by, a side street, the verge on Weston Crescent. A car stopped quickly very seldom has lasting damage, because the fuel drain and the flush, which still go first, take care of it.
What Weston people get told about petrol in a diesel — and the myths in it
Myth: topping up to full with diesel makes it fine. It doesn't. Topping up removes nothing; it gives you a fuller tank of the same mixture. The assumption behind the guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
"Current diesels can handle a little petrol" — a myth, and closer to the opposite. Lubrication counts more on modern diesels, not less, because their fuel runs through more precise parts at higher pressure.
"It starts, it drives, and so there is no harm" — the myth that catches most motorists than any other. Any petrol motor fed diesel usually won't run, and so the driver stops and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile your pump wears. Running does not mean fine.
Myth: "Add some two-stroke oil and drive the car home." It is an outdated fix for a different fault. It does not put back what petrol has thinned, and the petrol is still inside the tank after that.
Myth: "Drain that tank yourself and you are sorted." After the engine has been run, some of the petrol is no longer in that tank: it's in the filter and the fuel lines, and it goes right back through your pump at the next start. Also, a can of petrol drained at the kerbside is genuinely hazardous.
How does petrol in a diesel happen?
On purpose? Never. Through carelessness? Rarely, if ever. The petrol nozzle is the slimmer of the two and slips into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol car at all. The forecourt makes it simple, and the mistake runs one way.
When habit and the car stop matching, it takes place. Hire cars, courtesy cars, and motors that are new to you. Two vehicles on one driveway, one petrol, one diesel. A familiar forecourt with the pumps in a different order. Filling up in a hurry en route to Runcorn, with a train to catch. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you at the forecourt for its first tank — that is when. Throw in rain, a phone call or a back seat full of kids, and the hand does what it has always done.
Next time you fill up around Weston: preventing petrol in a diesel
- A green handle for unleaded and black for diesel is usual in the UK — yet not on each forecourt. Trust the label on the petrol pump, not the colour.
- In a car you do not know, look inside the flap over your filler or at the cap before your first fill: many cars print the fuel there.
- Label your key. In a household with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- Before the nozzle comes off the pump the first time you fill a hired or new motor, say "diesel" aloud. Silly, perhaps, but it works.
- Tuck your phone away. This is an easy mistake to make while you're thinking about something else.
- Some diesels come with a filler built to reject a petrol nozzle, and devices you can add exist for vehicles without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the pump.
- Noticing it halfway? Stop at once. A weaker mixture results from less petrol in the tank, yet your next step stays the same: don't crank it.
Weston: already put petrol in a diesel?
Then the order of things is brief. Don't switch the ignition on, and do not crank it. If you are still at the forecourt — North West Fuels or anywhere else — ask the attendants to help you roll the car clear of the petrol pump. Then call 0333 366 0103 and tell us what was put in, about how much, and whether it has run.
Corrosion and deposits are the issue with AdBlue, where petrol means lost protection. So if it was AdBlue, say so — and read its own Weston page.
Weston petrol in a diesel jobs: why one costs more than another
Four different jobs lie behind the four scenarios above — which is why there is no fair single quote. The situation itself does most of the work of moving your cost. Two things come after that: the petrol that got in as a proportion of what the tank takes, then the place your car is in and whether a van can reach it safely.
Three queries come first, before any quote, instead of after — what was put in, how much, has it run — and this is the reason. With those replies, you get a straight figure instead of a range.
About Weston itself
Weston is a suburban area in Cheshire, situated near the coast and approximately 11 miles from Chester. Weston has a relatively low elevation of 78 metres and is part of a larger residential area that includes nearby Rocksavage and Weston Point. Weston is characterized by its semi-detached housing stock, which is typical of many suburban areas in the North West of England. Weston is also close to other nearby places such as Heath.
Fuel drain cover in Weston and across Cheshire
Rocksavage, Weston Point and Heath are among the places around Weston that the same vans work, answering petrol in diesel call-outs across Weston's WA postcode area. Our technicians drain wherever your vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
In Weston and still at the pump?
The best position there is, then — that's where you are. Keep it off. Call.