Should You Worry? Petrol in a Diesel Car in Barnt Green
Far less than you likely are, provided it hasn't been started. "Have I ruined it?" is the first question anyone in Barnt Green asks, and the truthful answer is normally no, since petrol left in a diesel tank hurts nothing until it is dragged through the system — by ignition priming, by the starter, or by being driven. To leave the car like that, ring Petrol in Diesel then leave your engine alone. What petrol actually does to a diesel, how to judge how far it has gone, and how to stop it from happening again: that is the remainder of this page.
Inside the engine: what petrol in a diesel really does
Two tasks fall to diesel on its route through a motor. It lubricates first, and only then does it burn. Extremely fine gaps go into the injectors and the high-pressure pump, and only your diesel running through stops those surfaces grinding together.
Of those two jobs, petrol handles the first poorly and the second not at all. A pump working on a petrol mixture is wearing itself out, since petrol is thinner than diesel and strips out the protection your 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 is where the rattling comes.
The shape of the problem is clear once you put those together. It is circulation that does the harm, not contact. Where that petrol is only in your tank, it's an issue of fuel, nothing more. A pump that has been running on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with the fuel to the fuel injectors downstream.
Barnt Green, petrol in a diesel: four cases, from mild to significant
Filled up, and not started: no case is better. At a forecourt, and genuinely only there, that petrol is still confined to that tank — because everywhere else the vehicle was driven to get to it. The task is emptying and rinsing on the spot.
Started for a moment, or just the ignition on. The fuel system has been bled, so petrol has left the tank and got to the filter and your lines. Drain, flush, see to your filter: still usually straightforward.
The pump now worked a couple of miles on diluted fuel — that is what driving it does. Tank, lines, filter, then clean fuel run through the whole circuit: that's this work, and the way your car was driven counts as much as the mileage. Short trips, such as the school run to St Andrew's CofE First School, are one matter. Driving as far as Birmingham, under 10 miles away, makes a very different job — as does any distance on the M42, under a mile from Barnt Green, with the motor running hard the whole time.
Rattling, a lumpy idle, smoke, a throttle gone soft: driven until it complained. What you are hearing is your motor signalling fuel that no longer behaves like diesel. Stop on the spot — on the verge on Victoria Mews, at the kerb, down a side road — and do not move it again. Permanent damage is very rare when a car is pulled over soon, and the fuel drain and flush-through that still come first take care of it.
Myths Barnt Green drivers hear about petrol in a diesel
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing comes out when you top up — your tank just carries more of the same mixture. The idea behind that advice — that diesel fuel systems accept petrol by percentage — is wrong.
"Modern diesels can handle a little petrol" — a myth, and closer to the reverse. Lubrication counts more on modern diesels, not less, because their fuel runs through finer parts at higher pressure.
This is the one that fools people. Myth: "If it starts and drives, there is no harm done." Feed diesel to a petrol motor and it normally will not run, and so the driver stops — and the damage stops with them. Feed petrol to a diesel and it normally starts, idles and pulls away as if nothing has happened — all the while its pump is wearing. Being able to run isn't proof of being fine.
Myth: "Add some two-stroke oil and drive it home." It is an old workaround for a separate problem. The petrol is still inside the tank after that, and what it has diluted isn't put back.
The next start sends petrol back round the pump out of the lines and the fuel filter, where some of it sits after your engine has run. That's why draining your tank yourself doesn't sort it — a myth. And, a can of petrol filled by the kerbside is genuinely dangerous.
Why petrol in a diesel takes place so easily
A careless moment is seldom the cause, and nobody means to do it. One way only, because of the nozzles: the narrower petrol one slips inside a diesel filler with almost no resistance, while the diesel one generally will not fit a petrol car. That is how the forecourt makes it easy.
Routine and the vehicle falling out of step is how it occurs. Hire cars, courtesy cars, and motors that are new to you. Households running one of each, petrol and diesel. A familiar forecourt with the pumps in a different order. A train to catch, and a rushed 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. Your hand does what it has always done when you add rain, a phone call or a back seat full of kids.
How to prevent petrol in a diesel at your next fill-up in Barnt Green
- The label is what matters, so read the pump instead of the colour: in the UK unleaded handles are normally green and diesel black, but not on each forecourt.
- Check your filler flap. Plenty of motors state the fuel type inside the flap or on the cap. Look at it on your first fill in any car you don't know.
- One of each in the house? Label your key to the diesel — a bright fob, a sticker — since meaning to remember is not enough.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the petrol pump. It sounds daft and it works.
- Thinking about something else is when this becomes an easy mistake to make, so tuck your phone away and keep your mind on the pump.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler built to refuse a petrol nozzle, and add-on devices are available for the remainder. Count it as a backstop, and keep reading the pump.
- Stop the moment you notice. Less petrol in that tank makes a weaker mix. It doesn't change what to do next, which is still not to start it.
Barnt Green: already put petrol in a diesel?
Short and simple, then, is the order of things. Do not turn the ignition on, and don't crank it. The staff at the forecourt — whether at Harvest Energy itself or wherever you filled up — will normally help push it clear of the petrol pump if you ask. Next, 0333 366 0103. We'll ask what went in, about how much, and if it has been run.
Corrosion and deposits are the issue with AdBlue, where petrol brings lost lubrication. So if it was AdBlue, say so — and see its own Barnt Green page.
Why one petrol in a diesel job in Barnt Green costs more than another
There is no honest single quote for this, because the four scenarios above are four separate jobs. Which of them you're in is chiefly what shifts the cost. The proportion matters next, meaning how much of that tank is petrol, and then the position of your car and whether getting to it is safe for a technician.
Ahead of any quote, not after, we ask three questions: the fuel that got in, its amount, and whether it has run. That's why. With those answers, there is a straight figure rather than a range.
About Barnt Green, for a moment
Barnt Green is a village in Worcestershire, situated in the West Midlands region of England, with a population of around 1665 people. Barnt Green sits at an elevation of 161 metres, approximately 8.9 miles south of Birmingham and 98.9 miles northwest of London. Barnt Green is characterised by its predominantly detached housing stock, with nearby places including Kendal End, Withybed Green, and Cofton Hackett. Barnt Green remains a quiet residential community with a strong sense of village identity.
Barnt Green and Worcestershire: where our fuel drain cover reaches
Our vans answering petrol in diesel call-outs in Barnt Green, in the B postcode area, equally work the locations around it, Kendal End, Withybed Green and Cofton Hackett among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots our engineers drain, and the vehicle doesn't need to come to us.
In Barnt Green and still at the petrol pump?
Then you're in the best position there can be. Leave the vehicle switched off, and ring.