North Town: Petrol in a Diesel Car? How Worried to Be
If it has not been started, worry less than you likely are. "Have I ruined it?" is the first question anyone in North Town asks, and the truthful answer is normally no, since petrol resting in a diesel tank hurts nothing till it is drawn through the system — by ignition priming, by your starter, or by driving. Petrol in Diesel is who to call, with your motor kept off, and so it stays that way. Further down, this page sets out what petrol really does inside a diesel, how far it might have got, and how to stop it happening to you again.
The engine and petrol in a diesel: what goes on
Passing through a motor, diesel is doing two jobs at the same time. Before it burns, it protects — then it ignites. The high-pressure fuel pump and the injectors are made to very fine gaps, and your diesel passing through them is what keeps those surfaces from wearing down against each other.
The second task petrol does not do at all, and the first it does poorly. Being less viscous than diesel, petrol strips out the protection a fuel system needs, leaving a pump running on that mixture wearing itself. It's also made to resist igniting under compression — the reverse of what a diesel needs — which is where you get the knocking.
Combined, those make the shape of the issue clear. Contact doesn't do the damage — circulation does. All a tank with petrol in it amounts to is a fuel problem. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds travels on with the fuel to the fuel injectors further on.
North Town, petrol in a diesel: four situations, from mild to serious
The best case there can be: filled up, never started. Being on a forecourt is what makes this the case: elsewhere, the car has been driven there to begin with. With the petrol held in the tank alone, it is cleared and flushed on the spot, and nothing more is needed.
Ignition on, or started for a second. Petrol has come out of that tank and got to your filter and the fuel lines, since the fuel system has been primed. Usually nothing more than draining, flushing and sorting your filter, and so still easy.
Those few miles driven were the pump labouring on fuel weakened by petrol throughout. Mileage is only half of it; how hard it was driven matters equally. Either way the work includes the tank, the lines, your filter and clean fuel through the entire system. Driving the kids to North Town Academy is one kind of trip. Very different again: a trip to Wells, under 25 miles away, or any miles on the M5, under 3 miles from North Town, where the motor kept working hard.
Driven on till it complained — rattling, smoke, a ragged idle, a dead throttle. The fuel is not behaving like diesel any more, and the motor is telling you. Leave it wherever it has stopped: a lay-by, a side street, the verge on Yarde Place. Lasting damage is very rare if a car is stopped soon, and the drain and flush-through that still go first sort it out.
Petrol in a diesel stories North Town drivers hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Topping up takes out nothing; it gives you a fuller tank of the same mix. Percentage is not how a diesel fuel system copes with petrol, whatever that advice presumes.
Myth: "A current diesel can cope with a bit of petrol." If anything, the opposite. At higher pressure, through finer parts: that is how a current diesel handles its fuel, so the protection matters more, not less.
This is the one that catches motorists. Myth: "If it starts and drives, there's no harm done." The motorist of a petrol motor fed diesel usually has no choice but to stop, since it will not run, and the damage stops there. Feed petrol to a diesel and it normally fires up, ticks over and pulls away like nothing happened — all the while its pump wears. Fine and running are not the same at all.
An outdated fix for a different issue is behind this one. Myth: "Add some two-stroke oil and drive the car home." None of what petrol diluted gets put back by it — and later, your tank still holds the petrol.
Once the motor has run, part of that petrol sits in the filter and the lines, not the tank — and your next start sends it straight back through your pump. So the myth "drain your tank yourself and you are sorted" does not hold. On top of that, petrol cleared into a can by the road is truly risky.
How it happens: petrol in a diesel
On purpose? Never. Through carelessness? Rarely, if ever. A diesel nozzle mostly won't go into a petrol car, but the slimmer petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error easy, and just in that direction.
The moment habit stops matching the car is the moment it takes place. Courtesy car, hire car, or a vehicle that is new. Households running one of each, petrol and diesel. Your usual forecourt, its pumps now in a different order. A train to catch, and a hurried fill on the way to Taunton. The first fill-up in a diesel Volkswagen Tiguan after years of driving petrol is exactly the moment it happens. With rain, a call arriving, or children to deal with, your hand just does what it always has.
North Town motorists: how to prevent petrol in a diesel next time
- The label is what counts, and so check the petrol pump rather than the colour: in the UK unleaded handles are usually green and diesel black, but not on each forecourt.
- The first fill in an unfamiliar car is the time to check your filler flap — inside it, or on the cap, many motors 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 is not enough.
- Before the nozzle leaves the petrol pump the first time you fill a hired or new motor, say "diesel" out loud. Silly, perhaps, but it does the trick.
- Mistakes like this are easy to make while your mind is on something else, and so your phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to refuse a petrol nozzle, and add-on devices are available for cars without one. They are a safety net, not a reason to stop checking the petrol pump.
- Less petrol means a thinner blend, so stop the moment you realise — while remembering that the next step is unchanged. It's still not to fire it up.
North Town: already put petrol in a diesel?
Then the order of things is short. Leave it unstarted, with the ignition switched off too. The staff on the forecourt — whether at Morrisons itself or wherever you filled up — will normally help roll it away from the petrol pump if you ask. Call 0333 366 0103 next, with three facts — the fuel, the approximate quantity, and whether it has run.
Say so if it was AdBlue rather than petrol: it is a separate issue, with its own page for North Town, because AdBlue brings corrosion and deposits rather than lost lubrication.
Why one petrol in a diesel job in North Town costs more than another
A fair single price doesn't exist here: four scenarios, four separate jobs. The situation itself does most of the work of moving the cost. Where the car is counts too, and whether a van can safely reach it, after the proportion of petrol to what that tank holds.
Three queries come first, before quoting, instead of after — what went in, how much, has it run — and this is the reason. Those answers change a range into a straight figure.
About North Town, for a moment
North Town is a suburban area located on the riverside in Somerset, with a relatively low elevation of 16 metres. North Town sits near the cities of Wells and Taunton, and is close to smaller places like Tangier and Rowbarton. North Town is characterized by a high proportion of flat housing, and is home to a population of around 5944 people. North Town is situated in the South West region, approximately 133 miles from London.
Fuel drain cover in North Town and across Somerset
North Town sits in the TA postcode area, and our vans that answer petrol in diesel call-outs there work the locations near it as well — Tangier, Rowbarton and Taunton among them. The car does not need to come to us: our engineers drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
At the pump in North Town, still?
The best spot there is, then — that's where you are. Keep it off. Ring.