How Worried Should You Be? Petrol in a Diesel Car in Westvale
Not started? Then less worried than you likely feel. Till the ignition primes the pump, your starter cranks, or the car is driven, petrol in a diesel tank simply waits there and does no harm. Which means the truthful reply to the first Westvale question — "have I ruined it?" — normally no. Keep it like that: leave the engine off and phone Petrol in Diesel. 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 again.
Petrol in a diesel: what does it do to your engine?
On its way through a motor, diesel has two jobs. Before it combusts, it lubricates — and then it combusts. Extremely fine tolerances go into your injectors and your high-pressure pump, and only your diesel running through stops their surfaces grinding together.
The second job petrol doesn't do at all, and the first it does poorly. A pump working on a petrol mixture is wearing itself out, because petrol is runnier than diesel and takes away the lubrication the fuel system relies on. Petrol is also made to resist igniting under compression — the opposite of what a diesel needs from its fuel — and that's where the clattering comes.
The shape of the trouble is plain once you put those together. Contact does not do the damage — movement does. Where the petrol is only in your tank, it is a problem of fuel, nothing more. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with your fuel to your injectors further on.
Petrol in a diesel in Westvale: how bad is it? Four situations
Filled up, and not started: nothing beats it. Being at a forecourt is what makes this the case: elsewhere, the car has been driven there to begin with. With the petrol held inside your tank alone, it is emptied and rinsed on the spot, and nothing more is needed.
Started for a moment, or only the ignition on. With the fuel system primed, the fuel lines and filter already contain petrol that has come from your tank. That's generally still a straightforward job — a drain, a flush, and the fuel filter dealt with.
Those few miles driven meant your pump labouring on fuel diluted by petrol throughout. Miles is only half of it; how hard it was driven counts just as much. Either way this work runs to the tank, the lines, your filter and fresh fuel through the entire circuit. The school run to Westvale Primary School is one matter. Getting as far as Liverpool, under 10 miles away, makes a very different job — as does any mileage on the M57, under a mile from Westvale, with the engine running hard all the way.
Driven on until it protested — rattling, smoke, a lumpy idle, a soft throttle. What you are hearing is the motor signalling fuel that no longer behaves like diesel. Leave it where it stops: a lay-by, a quiet street, the verge on Oatlands Road. A vehicle pulled over soon very rarely has permanent damage, because the drain and the flush, which still go first, sort it out.
Westvale drivers and the petrol in a diesel myths they hear
Myth: topping up to full with diesel makes it fine. It does not. Nothing is removed by topping up — you're left with a bigger tank, still the same mixture. That guidance assumes a diesel fuel system handles petrol by percentage. It doesn't.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the opposite. A current diesel sends its fuel through smaller parts at higher pressure, which makes the protection count more, not less.
Myth: "If it starts and drives, there's no harm done." This is the one that catches people. Feed diesel to a petrol engine and it usually will not run, so the driver stops — and the harm stops with them. A diesel fed petrol usually starts, idles and drives away as if nothing has happened, whilst your pump wears. Running is not the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, taken from a fix from years ago, for a different problem. The petrol is still inside that tank afterwards, and what it has diluted isn't put back.
Myth: "Drain that tank yourself and you are sorted." Once the engine has run, some of the petrol is no longer inside that tank: it is in the filter and your lines, and it goes straight back through your pump on your next start. Draining petrol into a can by the roadside is also genuinely hazardous.
How petrol ends up: petrol in a diesel
No one does it on purpose, and it is seldom carelessness. The petrol nozzle is the slimmer of the two and slips into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol vehicle at all. The forecourt makes it easy, and the slip runs one way.
Habit and your car falling out of step is how it occurs. Courtesy car, hire car, or a car that is new. A household with one petrol and one diesel on the driveway. A forecourt you know, but with its pumps arranged differently. Fuelling up in a rush on the way to Kirkby, with a train to catch. Years of petrol cars behind you, a diesel Volkswagen Golf in front of you at the forecourt for its first tank — that's when. With rain, a call arriving, or a car full of children to deal with, the hand just does what it always has.
Next time you fill up around Westvale: avoiding petrol in a diesel
- Read 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.
- In a car you don't know, look inside the flap over the filler or at the cap before the first fill: many vehicles print the fuel there.
- One of each in the house? Label your key to your diesel — a bright fob, a sticker — since intending to remember isn't enough.
- It seems daft and it does the trick: on your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump.
- Mistakes like this are easy to make while your mind is on something else, so your phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to refuse a petrol nozzle, and add-on devices exist for the rest. Count it as a safety net, then keep checking the pump.
- Less petrol means a thinner blend, and so stop the moment you notice — though remembering that the next step is unchanged. It is still not to start it.
Petrol already in a diesel around Westvale? Start here
The order of things is brief, then. Leave it unstarted, with your ignition off as well. Yet on the forecourt, at the nearest petrol station or anywhere else? Ask the attendants to help you push it clear of the pump. Then call 0333 366 0103 and tell us what went in, roughly how much, and whether it has run.
If it was AdBlue rather than petrol, say so. That is a different problem — corrosion and deposits and not lost protection — and it has its own page for Westvale.
Why one petrol in a diesel task around Westvale costs more than another
The four scenarios above are four different jobs, so no single quote for this would be honest. The situation itself does most of the work of moving the cost. Where your car is counts too, and whether a technician can safely reach it, after the ratio of petrol to what that tank holds.
What went in, how much, and if it's run — three queries our technicians ask before quoting, not after, for precisely that reason. With those replies, there is a straight figure instead of a range.
About Westvale
Westvale is a suburban area in Merseyside, situated on the riverside with an elevation of 22 metres, and is located approximately 5.7 miles from Liverpool. Westvale has a mix of housing types, but is predominantly characterised by terraced homes. Westvale is close to nearby places such as Kirkby Park and Kirkby, and is part of the wider Liverpool urban area.
Fuel drain cover across Merseyside, Westvale included
Westvale sits in the L postcode area, and our vans that answer petrol in diesel call-outs there work the locations near it as well — Kirkby Park, Kirkby and Waddicar among them. The vehicle doesn't need to move to us: we drain at a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
Westvale: still at the petrol pump?
The best place there is, then — that is where you are. Ring, and leave it turned off.