How Worried Should You Be? Petrol in a Diesel Car in Rawnsley
Unstarted? Then less worried than you probably are. Petrol resting in a diesel tank does nothing to the motor until something pulls it through your fuel system — your ignition priming the pump, the starter, or the drive on its own. So the truthful answer to the first query everyone in Rawnsley asks, "have I ruined it?", is generally no. Leave the motor off then phone Petrol in Diesel — that keeps it like that. The rest of this page explains what petrol really does to a diesel, how to tell how far it has got, and how to make sure it doesn't happen to you again.
Petrol in a diesel: what does it do to the motor?
On its way through a motor, diesel does two tasks. It protects first, and only then does it burn. Designed to very fine clearances, your injectors and the pump rely on the diesel flowing through them to keep their surfaces from wearing against one another.
Badly at the first, not at all at the second: that's petrol. Being less viscous than diesel, petrol strips away the protection a fuel system needs, so a pump running on the mixture wearing itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is why you get the rattling.
The shape of the problem is clear once you put those together. Contact doesn't do the harm — movement does. Any tank with petrol in it is a fuel problem. Once the pump has been running on that petrol, a mechanical issue has started: whatever is shed by a pump that's wearing is carried onward to your injectors with your fuel.
Petrol in a diesel around Rawnsley: how serious is it? Four situations
The best case there is: filled up, never started. At a forecourt, and really only there, the petrol is still limited to that tank — because anywhere else the car was driven to get to it. The task is emptying and purging on the spot.
A moment's running, or merely the ignition on. With the fuel system primed, your lines and filter already contain petrol that came from the tank. Usually little more than draining, flushing and seeing to the filter, and so still simple.
Your pump has spent a couple of miles on thinned fuel — that is what driving the car does. The work is the tank, your lines, the fuel filter and fresh fuel through the entire circuit, and how hard the car was driven counts as much as how far. Short trips, such as the school run to Hazel Slade Primary Academy, are one matter. Any distance on the M6 Toll, under 3 miles from Rawnsley, means the engine has worked hard throughout, and a run to Lichfield, under 10 miles away, is a very different job as well.
Driven on till it protested — rattling, smoke, a lumpy idle, a soft throttle. The motor is telling you the fuel is no longer behaving like diesel. Leave it wherever it has stopped: a lay-by, a quiet street, the verge on Littleworth Road. Long-term damage is very uncommon when a car is pulled over early, and the fuel drain and flush-through that still go first sort it out.
Petrol in a diesel myths Rawnsley drivers hear
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing comes out when you top up — that tank just holds more of the same blend. The assumption behind that advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. A current diesel sends its fuel through finer components at higher pressure, which makes the protection count more, not less.
The myth that catches drivers 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 damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump grinds. A running engine does not mean fine.
Myth: a two-stroke additive makes it safe to drive home. It is an old workaround, supposed for another problem. The petrol is still inside the tank after that, and what it has diluted isn't put back.
If the engine has run, part of the petrol sits in your filter and the fuel lines, not your tank — and the next start sends it straight back through the pump. So the myth "drain the tank yourself and you are sorted" doesn't stand up. Emptying petrol into a can at the kerbside is also truly dangerous.
Why petrol in a diesel happens at all
On purpose? Never. Through carelessness? Seldom, if ever. One way only, because of the nozzles: the smaller petrol one slides inside a diesel filler with almost no resistance, whereas the diesel one generally will not fit a petrol vehicle. That's how the forecourt makes it easy.
When routine and the vehicle stop matching, it occurs. Hire cars, courtesy cars, and motors that are new to you. Two motors on one driveway, one petrol, one diesel. A forecourt you know, only with its pumps laid out differently. Racing for a train at Hednesford and filling up en route. The first fill-up in a diesel Renault Megane after years of driving petrol is exactly the moment it takes place. Add rain, a phone call or a back seat full of kids, and the hand repeats what it has always done.
Next time you fill up in Rawnsley: avoiding petrol in a diesel
- Read the pump, not the colour. In the UK unleaded handles are normally green and diesel black, but not on each forecourt. The label is what matters.
- The first fill in a strange vehicle is the time to check your filler flap — on it, or on the cap, plenty of cars state the fuel they take.
- One of each in the home? Mark your key to the diesel — a bright fob, a sticker — because meaning to remember isn't enough.
- "Diesel", out loud, before you pick up the nozzle — each time a new or hired car gets its first tank. It sounds silly. It does the trick.
- Whilst you are thinking about something else, this is an easy mistake to make — so put your phone away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to block a petrol nozzle, and add-on devices exist for vehicles without one. They are a safety net, not a reason to stop reading the pump.
- Stop as soon as you notice. Less petrol in that tank makes a weaker mixture. It does not change what to do next, which is still not to crank it.
Rawnsley: already put petrol in a diesel?
The order of things is short, then. Leave it unstarted, with the ignition off too. The staff at the forecourt — whether at Esso itself or wherever you filled up — will usually help roll it away from the pump if you ask. Then call 0333 366 0103 and tell us what got in, roughly how much, and if it has run.
If it was AdBlue rather than petrol, say so. That's a separate problem — corrosion and deposits instead of lost protection — and it has its own page for Rawnsley.
Rawnsley petrol in a diesel jobs: why one costs more than another
The four situations above are four separate jobs, so no single price for this would be honest. The situation itself does most of the work of moving your cost. Two things come after that: the petrol that went in as a proportion of what your tank takes, then the spot your car is in and whether our van can reach it safely.
What was put in, how much, and whether it has run — three queries our engineers ask before pricing, not after, for exactly that reason. A range becomes a straight figure once the replies are in.
About Rawnsley, briefly
Rawnsley is a village in Staffordshire, situated approximately 6 miles north of Lichfield, and is characterized by its semi-detached housing stock. Rawnsley sits in a rural area at an elevation of around 200 metres, surrounded by nearby places such as Wimblebury and Hazelslade. Rawnsley is home to a population of around 1866 residents, and is located about 114 miles northwest of London. Rawnsley remains a typical example of a small English village with a strong sense of community.
Fuel drain cover across Staffordshire, Rawnsley included
Rawnsley sits in the WS postcode area, and our vans that answer petrol in diesel calls there work the places near it as well — Wimblebury, Hazelslade and Littleworth among them. A forecourt, a supermarket car park, a lay-by or your own drive are all spots our technicians drain, and the vehicle doesn't need to move to us.
At the pump around Rawnsley, right now?
Then you are in the best place there is. Keep it off. Phone.