How Worried Should You Be? Petrol in a Diesel Car in Jamestown
Probably less than you are now — provided no one has started it. "Have I ruined it?" is the first thing anyone around Jamestown asks, and the honest answer is normally no, since petrol resting in a diesel tank hurts nothing until it's dragged through your fuel system — by ignition priming, by the starter, or by driving. To leave the vehicle that way, ring Petrol in Diesel then leave the engine alone. What petrol really does to a diesel, how to gauge how far it has gone, and how to keep it from happening again: that is the remainder of this page.
Your engine and petrol in a diesel: what goes on
Diesel does two tasks on its way through a motor. It burns, and before it ignites it protects. Made to extremely fine gaps, your injectors and the pump rely on the diesel flowing through them to keep their surfaces from wearing against one another.
The second task petrol doesn't do at all, and the first it does poorly. The knocking comes from petrol being designed not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips out the lubrication the fuel system depends on, and any pump running on such a mixture is wearing itself.
Seen together, they make clear the shape the problem has. Not contact but movement is what does the damage. Where the petrol is only in your tank, it is a problem of fuel, nothing more. Whatever a worn pump sheds goes on, borne by your fuel, into the fuel injectors downstream, which is why a pump that has been working on the petrol is where a mechanical issue begins.
Petrol in a diesel in Jamestown: how serious is it? Four cases
Filled but never started — the best it gets. On a forecourt, and genuinely only there, the petrol is still confined to the tank — since everywhere else your car was driven to get to it. The task is draining and rinsing on the spot.
A moment's running, or merely the ignition on. Petrol has left the tank and got to your filter and your lines, since the system has been primed. Drain, flush, deal with the filter: still usually simple.
The pump has spent a couple of miles on weakened fuel — that's what driving the car does. How hard the vehicle was driven counts as much as how far, and the work covers the tank, the fuel lines, the filter and clean fuel through the whole circuit. Short trips, like the school run to the local primary school, are one thing. Any miles on the M8, under 10 miles from Jamestown, means the motor working hard throughout, and a run to Glasgow, under 25 miles away, is a very different task as well.
Driven on till it complained — rattling, smoke, a ragged idle, a dead throttle. The fuel is not acting like diesel any more, and your engine is saying so. Stop wherever you are — the verge on Main Street, a lay-by, a side street — then leave the car there. Permanent damage is very unusual if a vehicle is pulled over quickly, and the fuel drain and flush-through that still go first take care of it.
Stories Jamestown motorists hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Topping up takes out nothing; it gives you a fuller tank of the same mixture. That advice assumes a diesel fuel system handles petrol by percentage. It does not.
Not so: a modern diesel copes with a bit of petrol. If anything, the reverse. Lubrication matters more on current diesels, not less, because their fuel runs through finer parts at higher pressure.
This is the one that fools people. Myth: "If it starts and drives, there is no harm done." Diesel in a petrol motor generally leaves a motor that will not run: the motorist stops, and so does the damage. While the pump wears, a diesel fed petrol usually starts, idles and drives away as though nothing has happened. Fine and running aren't the same thing.
Myth: "Add some two-stroke oil and drive the car home." It is an old workaround for a separate fault. None of what petrol weakened is put back by it — and afterwards, that tank still contains that petrol.
If the motor has run, part of that petrol is in the filter and the lines, not the tank — and your next start pulls it straight back through your pump. So the myth "drain the tank yourself and you're sorted" does not hold. Emptying petrol into a can at the kerbside is also genuinely hazardous.
How does petrol in a diesel take place?
On purpose? Never. Through carelessness? Seldom, if ever. The forecourt makes it simple: the petrol nozzle is the smaller 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 slip runs one way.
Habit and your car getting out of step is how it happens. A new motor, a hire car or a courtesy car. One petrol and one diesel on the drive of the same household. A well-known forecourt with the pumps in a different order. A rushed fill on the way to Balloch Central with a train to catch. Years of petrol motors behind you, a diesel Volkswagen Passat in front of you at the forecourt for its first tank — that's when. Add a back seat full of kids, a phone call or rain, and habit takes over.
How to prevent petrol in a diesel at your next fill-up around Jamestown
- Read the pump, not the colour. In the UK unleaded handles are normally green and diesel black, but not on every forecourt. The label is what counts.
- The first fill in an unfamiliar car is the time to check the filler flap — inside it, or on the cap, many cars state which fuel they take.
- Mark your key. In a home with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of meaning to remember.
- "Diesel", out loud, before you pick up the nozzle — each time a new or hired car gets its first tank. It sounds silly. It works.
- Mistakes like this are straightforward to make while your mind is on something else, so the phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to block a petrol nozzle, and add-on devices exist for the remainder. Treat it as a backstop, then keep reading the petrol pump.
- Stop as soon as you realise. Less petrol in your tank makes a thinner mix. It does not change what to do next, which is still not to fire it up.
Petrol already in a diesel in Jamestown? Start here
Then the order of things is brief. Don't turn your ignition on, and do not start it. Ask the attendants to help you push it away from the petrol pump if you are still on the forecourt, whether that is BP or somewhere else. Phone 0333 366 0103 next, with three facts — the fuel, the approximate volume, and whether it has run.
Say so if it was AdBlue instead of petrol: it's a different fault, with its own page for Jamestown, because AdBlue brings corrosion and deposits instead of lost lubrication.
Jamestown petrol in a diesel jobs: why one costs more than another
There is no fair single quote for this, since the four scenarios above are four separate jobs. The scenario itself does most of the work of moving the cost. Where the car is matters too, and whether a technician can safely get to it, after the proportion of petrol to what that tank holds.
That's why our engineers ask three queries before quoting rather than after: what went in, how much, and if it has run. Those answers change a range into a straight figure.
About Jamestown
Jamestown is a village situated on the riverside in West Dunbartonshire, with a relatively low elevation of 19 metres. Jamestown lies near the larger town of Balloch and the smaller settlements of Mill of Haldane and Levenvale. Jamestown has a mix of housing types, but terraced housing is predominant in the village. Jamestown is located approximately 15.9 miles from Glasgow, making it a commuter base for the city.
Across West Dunbartonshire and around Jamestown: fuel drain cover
Our vans answering petrol in diesel jobs in Jamestown, in the G postcode area, equally work the places around it, Mill of Haldane, Balloch and Levenvale among them. We drain wherever the car is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Jamestown: still at the pump?
No position is better: that's where you now are. Keep the car turned off, and ring.