How Worried Should You Be? Petrol in a Diesel Car in Seafield
Not started? Then less anxious than you probably are. Petrol resting in a diesel tank does nothing to the engine till something draws it through your fuel system — the ignition priming your pump, your starter, or driving on its own. So the fair answer to the first query anyone around Seafield asks, "have I ruined it?", is usually no. To leave it that way, call Petrol in Diesel then leave the motor switched off. Below, you will find what petrol actually does inside a diesel, how far it may have got, and how to stop it happening to you again.
Your engine and petrol in a diesel: what happens
Passing through a motor, diesel does two jobs at once. It lubricates to begin with, and after that does it burn. The high-pressure pump and the injectors are built to very fine tolerances, and the diesel passing through them is what keeps those surfaces from wearing down against one another.
Of these two tasks, petrol manages the first poorly and the second not at all. Being less viscous than diesel, petrol strips away the lubrication a fuel system needs, so a pump running on the blend wearing itself. It is equally made to resist igniting under compression — the reverse of what a diesel needs — which is why you hear the rattling.
Put these together and the shape of the issue is plain. The damage is done by circulation, not by contact. All a tank with petrol in it amounts to is a fuel problem. Once your pump has been working on that petrol, a mechanical problem has begun: whatever is shed by a pump that's wearing is carried onward to the injectors with the fuel.
Four situations we see around Seafield: how serious is petrol in a diesel?
Filled up, and not started: no case is better. Just the tank has petrol in it, so the task is draining that tank and rinsing the fuel system where your car sits. This scenario can only really happen at a forecourt: anywhere else, the vehicle got there by being driven.
Started for a moment, or only the ignition on. With the system primed, your lines and filter already contain petrol that has come from that tank. That is generally still an easy job — a drain, a flush, and the fuel filter seen to.
Those few miles driven meant your pump running on fuel weakened by petrol throughout. The work is your tank, the fuel lines, your filter and clean fuel through the whole system, and how hard the car was driven matters as much as how far. The school run to Haselworth Primary School is one thing. A run as far as Portsmouth, under 3 miles away, is a very different task. So is any mileage on the M275, under 3 miles from Seafield, where your engine has been working hard throughout.
Driven on until it protested — clattering, smoke, an uneven idle, a soft throttle. That is your engine telling you its fuel has stopped acting like diesel. Pull up wherever you are — the verge on Dolman Road, a lay-by, a side street — and leave the car there. What goes first is still the fuel drain and flush, and that sorts it out, with permanent damage very unusual if a vehicle is pulled over soon.
Petrol in a diesel myths Seafield motorists hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing is removed by topping up — you're left with a bigger tank, still the same mixture. The idea behind the guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
If anything, the opposite is true. Myth: "A current diesel can cope with a bit of petrol." At higher pressure, through finer parts: that is how a current diesel moves its fuel, so the protection counts more, not less.
The myth that catches people out: if it starts and drives, it must be unharmed. Any petrol engine fed diesel normally won't run, and so the driver stops and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile your 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 separate fault. What petrol has thinned remains diluted, and the petrol remains in your tank anyway.
If the motor has been run, part of the petrol sits in the fuel filter and your lines, not your tank — and your next start sends it straight back through your pump. So the myth "drain your tank yourself and you are sorted" doesn't hold. Draining petrol into a can by the kerbside is also genuinely dangerous.
How petrol ends up: petrol in a diesel
It's seldom carelessness, and nobody does it on purpose. The forecourt makes it simple: the petrol nozzle is the narrower of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle mostly will not go into a petrol motor at all. So the error runs one way.
When routine and the vehicle stop matching, it occurs. Any car that is new to you — a hire car, on loan as a courtesy car, or brand new. Households running one of each, petrol and diesel. Your normal forecourt, its pumps now in a different order. A hurried fill en route to Portsmouth Harbour with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver used to petrol: exactly when it takes place. With rain, a call arriving, or children to deal with, your hand just does what it always has.
Avoiding petrol in a diesel next time you fill up around Seafield
- The label is what matters, and so check the petrol pump rather than the colour: in the UK unleaded handles are normally green and diesel black, but not on each forecourt.
- The first fill in an unfamiliar vehicle is the time to check the filler flap — inside it, or on the cap, many motors state which fuel they take.
- Label your key. In a house with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of intending to remember.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump. It seems silly and it does the trick.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck the phone away and keep your mind on the pump.
- 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 cars without one. They are a backstop, not a reason to stop reading the pump.
- As soon as you realise, stop: less petrol in that tank makes a weaker mix. What to do next doesn't change, though — still do not fire it up.
Put petrol in a diesel in Seafield already?
The order of things is short, then. Don't turn the ignition on, and don't fire it up. Ask the attendants to help you push it clear of the petrol pump if you are still on the forecourt, whether that's Shell or anywhere else. What was put in, roughly how much, and if it's run: tell us that when you phone 0333 366 0103.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a different fault — Seafield has a page all for it.
Seafield petrol in a diesel jobs: why one costs more than another
The four situations above are four separate tasks, so no single quote for this would be fair. What shifts your cost is mostly which of them you're in. Where the car is matters too, and whether a van can safely get to it, after the proportion of petrol to what that tank holds.
Three queries come first, before any quote, instead of after — what got in, how much, has it run — and that is the reason. Those replies are what change a range into one firm number.
About Seafield and its setting
Seafield is a coastal suburban area in Hampshire, situated near the city of Portsmouth and close to the neighbouring areas of Newtown and Gosport. Seafield sits at a low elevation of around 4 metres, reflecting its proximity to the sea. Seafield is characterized by a high proportion of flat dwellings, which are typical of many coastal urban areas in southern England.
Seafield and Hampshire: where our fuel drain cover runs
Newtown, Gosport and Clayhall are among the places around Seafield that the same teams work, answering petrol in diesel jobs across Seafield's PO postcode area. The vehicle does not need to move to us: we drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
Still at the petrol pump in Seafield?
Then you're in the best spot there is. Keep it off. Ring.