Should You Worry? Petrol in a Diesel Car in Gillow Heath
Far less than you likely are, provided it hasn't been started. "Have I ruined it?" is the first question anyone around Gillow Heath asks, and the honest answer is generally no, because petrol left in a diesel tank hurts nothing till it's dragged through the system — by ignition priming, by your starter, or by driving. Keep it that way: leave your engine off and ring Petrol in Diesel. Below, this page sets out what petrol really does inside a diesel, how far it may have gone, and how to stop it happening to you a second time.
Inside the engine: what petrol in a diesel really does
Passing through a motor, diesel is doing two jobs at the same time. Before it combusts, it protects — and then it combusts. What keeps the surfaces inside the high-pressure fuel pump and your injectors from wearing down against each other is the diesel flowing through them — they're designed to extremely fine gaps.
The second job petrol does not do at all, and the first it does poorly. A pump running on a petrol blend is wearing itself out, since petrol is runnier than diesel and strips out the protection the fuel system depends on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that's where any clattering comes.
Put those together and the shape of the issue is plain. Not contact but movement is what causes the damage. A tank with petrol in it is a fuel issue. The beginning of a mechanical problem is a pump that has been running on that petrol — and whatever a worn pump sheds travels on with the fuel to the fuel injectors beyond it.
Four situations our engineers see in Gillow Heath: how serious is petrol in a diesel?
Filled up, and not started: no case is better. The petrol is in your tank and only the tank, and the task is a drain and a flush where your car stands. This is the one scenario that can only truly happen at a forecourt, because anywhere else the car has been driven to get there.
The ignition turned on, or a short start. Once primed, your system has pulled petrol out of the tank as far as the fuel filter and your lines. Normally little more than draining, cleaning and seeing to the fuel filter, so still straightforward.
A couple of miles driven, and the pump has spent every one of them running on weakened fuel. Distance is only half of that; how hard it was driven counts equally. Either way this work includes that tank, the lines, your filter and clean fuel through the whole system. On the school run to Kingsfield First School, the distance is short. Very different again: a trip to Stoke-on-Trent, under 10 miles away, or some miles on the M6, under 10 miles from Gillow Heath, where the engine never stopped running hard.
Clattering, a lumpy idle, smoke, a throttle gone soft: driven till it complained. What you are hearing is your engine signalling fuel that no longer runs like diesel. Pull up wherever you are — the verge on Well Lane, a lay-by, a side street — and leave it where it is. The fuel drain and flush still go first, and they sort it out: when a car is pulled over soon, long-term damage is very uncommon.
Petrol in a diesel myths Gillow Heath motorists hear
False: topping up to full with diesel makes it fine. It doesn't. Nothing is removed by topping up — you are left with a fuller tank, still the same mixture. Percentage isn't how a diesel fuel system tolerates petrol, whatever that guidance presumes.
If anything, the reverse holds. Myth: "A current diesel can cope with a bit of petrol." At higher pressure, through finer components: that's how a current diesel handles its fuel, so the protection counts more, not less.
The myth that catches people off guard: if it starts and drives, it must be unharmed. Any petrol motor fed diesel generally won't run, so the driver stops and the harm stops with them. Feed petrol to a diesel and it normally starts, idles and pulls away as if nothing happened — all while its pump is wearing. Fine and running are not the same thing.
Not so: a two-stroke additive makes it safe to drive home. It was an old fix, meant for another issue. What petrol has diluted remains weakened, and the petrol remains in your tank anyway.
"Drain it yourself and you're sorted" — a myth, because after it has been running some petrol lies in the filter and lines, ready to go right back through your pump at the next start. Draining petrol into a can by the kerbside is also genuinely dangerous.
How petrol ends up: petrol in a diesel
No one does it on purpose, and it's rarely carelessness. The forecourt makes it easy: the petrol nozzle is the narrower of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle mostly won't go into a petrol car at all. So the error runs one way.
Habit and the car falling out of step is when it occurs. A new vehicle, a hire car or a courtesy car. Two motors on one driveway, one petrol, one diesel. A well-known forecourt with the pumps in a different order. A train to catch, and a hurried fill en route to Congleton. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver accustomed to petrol: precisely when it takes place. Your hand repeats what it has always done when you add rain, a phone call or a back seat full of children.
Gillow Heath motorists: how to avoid petrol in a diesel next time
- The label is what matters, so read the pump rather than the colour: in the UK unleaded handles are usually green and diesel black, yet not on every forecourt.
- The first fill in a new vehicle is the time to check the filler flap — on it, or on the cap, plenty of motors state the fuel to use.
- Good intentions do less than a sticker or a fob in a vivid colour on your diesel's key when a home has one of each. So label it.
- "Diesel", aloud, before you pick up the nozzle — each time a new or hired car needs its first tank. It sounds silly. It does the trick.
- Put your phone away. This is an easy mistake to make whilst you're thinking about something else.
- Add-on devices exist for vehicles without one, and some diesels come with a filler that won't take a petrol nozzle. Useful — but a backstop only, never a reason to stop checking the label.
- Spotting it halfway? Stop at once. A weaker mixture follows from less petrol inside your tank, but your next step stays the same: don't crank it.
Petrol already in a diesel around Gillow Heath? Start here
The order of things is brief, then. Don't turn your ignition on, and do not start it. The attendants on 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 was put in, about how much, and whether it has run.
Say so if it was AdBlue instead of petrol: it is a different issue, with its own page for Gillow Heath, because AdBlue brings corrosion and deposits rather than lost lubrication.
One petrol in a diesel job around Gillow Heath costs more than another. Why?
Four separate tasks sit behind the four scenarios above — which is why there's no honest single price. The scenario itself does most of the work of moving your cost. After that it's the proportion — how much petrol was put in against how much that tank takes — and after that where the vehicle is and whether our van can get to it safely.
Three questions come first, before any quote, instead of after — what was put in, how much, has it run — and that is the reason. With the answers, there is a straight figure instead of a range.
About Gillow Heath and its setting
Gillow Heath is a suburban area in Staffordshire, situated near the River Biddulph and overlooking the surrounding countryside. Gillow Heath sits at an elevation of 173 metres, with semi-detached housing being the predominant type of accommodation. Gillow Heath is located close to several nearby places, including Pot Bank, Biddulph, and Congleton Edge, and is approximately 7.2 miles from Stoke-on-Trent. Gillow Heath has a population of around 2242 residents.
Gillow Heath and Staffordshire: where our fuel drain cover reaches
The teams answering petrol in diesel jobs in Gillow Heath, in the ST postcode area, equally work the places around it, Pot Bank, Biddulph and Congleton Edge among them. A forecourt, a supermarket car park, a lay-by or your own driveway are all spots our engineers work, and your car does not need to move to us.
Gillow Heath: still at the petrol pump?
Then, you could not be in a better spot. Turned off it remains; then ring.