Petrol in a Diesel Car in Foley Park: How Worried Should You Be?
Unstarted? Then less anxious than you likely are. Until your ignition primes your pump, your starter cranks, or the vehicle is driven, petrol in a diesel tank simply sits there and does nothing. Which makes the truthful reply to the first Foley Park query — "have I ruined it?" — normally no. To keep it like that, call Petrol in Diesel and leave the motor switched off. What petrol actually does to a diesel, how to judge how far it has gone, and how to stop it from happening again: that's the remainder of this page.
What petrol in a diesel does to your engine
Diesel has two tasks on its way through a motor. It combusts, and before it burns it lubricates. Built to very fine tolerances, your injectors and the pump rely on the diesel moving through them to stop their surfaces wearing against one another.
Of those two tasks, petrol handles the first poorly and the second never. A pump running on a petrol mix is wearing itself out, since petrol is thinner than diesel and takes away the lubrication your fuel system depends on. Petrol is also made to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that is where the rattling starts.
Together, those leave the shape of the trouble clear. It's movement that causes the damage, not contact. All a tank with petrol in it amounts to is a fuel fault. Whatever a worn pump sheds travels on, borne by your fuel, into the fuel injectors downstream, which is why a pump that has worked on the petrol is where a mechanical issue begins.
How bad is petrol in a diesel? Four situations our engineers see around Foley Park
Filled up, never started. The best case there is. Being at a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With the petrol kept inside the tank alone, it's cleared and rinsed on the spot, and nothing more is needed.
A brief spell of running, or just the ignition on. With the fuel system primed, the lines and filter now contain petrol that has come from the tank. Normally little more than clearing, flushing and sorting the fuel filter, so still simple.
Those few miles on the road meant the pump labouring on fuel weakened by petrol throughout. The work is the tank, your lines, the fuel filter and fresh fuel through the whole system, and how hard the vehicle was driven matters as much as how far. Short trips, such as the school run to Foley Park Primary Academy, are one thing. A run as far as Worcester, under 15 miles away, is a very different job. So is any mileage on the M5, under 10 miles from Foley Park, where the engine has been running hard throughout.
Driven on till it protested — clattering, smoke, an uneven idle, a soft throttle. The fuel is not behaving like diesel any more, and your motor is telling you. Whether it's the verge on Reservoir Road, a lay-by or a side road, stop where you are then leave it. What comes first is still the drain and flush, and that takes care of it, with lasting damage very unusual when a vehicle is stopped quickly.
Stories Foley Park drivers hear about petrol in a diesel
"Top it up the rest of the way with diesel and it will be fine" — a myth. It will not. Topping up takes out nothing; it gives you a fuller tank of the same mixture. That guidance presumes a diesel fuel system tolerates petrol by percentage. It does not.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the reverse. Lubrication counts more on modern diesels, not less, because their fuel passes through more precise parts at higher pressure.
This is the one that fools drivers. Myth: "If it starts and drives, there is no damage done." Diesel in a petrol motor generally leaves a motor that won't run: the motorist stops, and so does the damage. A diesel fed petrol normally starts, idles and drives away as though nothing has happened, whilst the pump grinds. Running is not the same as fine.
"A drop of two-stroke oil and drive it home" — a myth, borrowed from a fix from years ago, for a distinct issue. None of what petrol weakened gets put back by it — and later, that tank still contains the petrol.
The next start sends petrol back round your pump out of the fuel lines and the filter, where some of it ends up once the engine has run. That is why draining the tank yourself doesn't sort it — a myth. Also, a can of petrol filled by the kerbside is truly hazardous.
How does petrol in a diesel happen?
On purpose? Never. Through carelessness? Seldom, if ever. A diesel nozzle generally won't go into a petrol motor, yet the slimmer petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake simple, and just in one direction.
It occurs when routine and the vehicle stop matching. Hire cars, courtesy cars, and motors that are new to you. Households running one of each, petrol and diesel. Your ordinary forecourt, its pumps now in a different order. A train to catch, and a rushed fill on the way to Kidderminster. Years of petrol motors behind you, a diesel Volkswagen Passat in front of you at the forecourt for its first tank — that is when. With rain, a call coming in, or a car full of children to deal with, the hand simply does what it always has.
Foley Park drivers: how to avoid petrol in a diesel next time
- Not every forecourt in the UK follows green for unleaded and black for diesel, even if most usually do. Check the pump's label; the colour is only a clue.
- In a car you do not know, look inside the flap over the filler or at the cap before the first fill: plenty of vehicles print the fuel type there.
- One of each in the house? Mark your key to the diesel — a coloured fob, a sticker — because intending to remember isn't enough.
- "Diesel", out loud, before you pick up the nozzle — every time a new or hired car needs its first tank. It seems silly. It does the trick.
- Mistakes like this are easy to make while your mind is on something else, so your phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to reject a petrol nozzle, and add-on devices are available for vehicles without one. They are a safety net, not a reason to stop reading the pump.
- Spotting it mid-fill? Stop at once. A weaker mix results from less petrol in the tank, yet your next step stays the same: do not fire it up.
Foley Park: already put petrol in a diesel?
The order of things is short, then. Don't turn your ignition on, and don't fire it up. Ask the attendants to help you roll it clear of the petrol pump if you're still at the forecourt, whether that's Esso or somewhere else. Phone 0333 366 0103 next, with three answers — the fuel, the rough volume, and whether it's run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a different issue — Foley Park has a page just for it.
Foley Park petrol in a diesel jobs: why one costs more than another
There is no fair single quote for this, since the four situations above are four different jobs. The scenario itself does most of the work of moving your cost. Where the vehicle is matters too, and whether our van can safely reach it, after the ratio of petrol to what the tank holds.
Three queries come first, before any quote, rather than after — what went in, how much, has it run — and that is the reason. With those replies, you get a straight figure rather than a range.
About Foley Park and where it is
Foley Park is a suburban area in Worcestershire, situated on the riverside at an elevation of 57 metres. Foley Park lies near several other local places, including Sutton Farm, Blakebrook, and Birchen Coppice, and is located approximately 12.8 miles from Worcester. Foley Park has a population of around 5882 people and predominantly features semi-detached housing. Foley Park is also within commuting distance of larger cities, being around 108.9 miles from London.
Across Worcestershire and in Foley Park: fuel drain cover
Petrol in diesel call-outs around Foley Park — part of the DY postcode area — go to teams that also cover the spots about it, Sutton Farm, Blakebrook and Birchen Coppice included. Our technicians drain wherever the car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
In Foley Park and still at the pump?
Then you're in the best position there is. Keep it off. Ring.