Should You Worry? Petrol in a Diesel Car in Townsend
Probably less than you are now — as long as nobody has started the vehicle. Petrol sitting in a diesel tank does nothing to the engine till something draws it through the system — the ignition priming your pump, the starter, or driving on its own. So the honest answer to the first question anyone around Townsend asks, "have I ruined it?", is usually no. Keep it like that: leave your motor off then call Petrol in Diesel. Further down, this page sets out what petrol actually does inside a diesel, how far it may have gone, and how to stop it happening to you a second time.
Your engine and petrol in a diesel: what goes on
Passing through a motor, diesel is doing two jobs at once. Before it burns, it protects — then it combusts. What keeps the surfaces inside your high-pressure pump and the injectors from wearing down against each other is your diesel passing through them — they're built to very fine gaps.
The second task petrol does not do at all, and the first it does badly. The rattling comes from petrol being designed not to ignite when compressed, which is exactly the opposite of what a diesel needs. On top of that it is thinner than diesel, it strips away the protection the system rests on, and any pump working on that mix is wearing itself.
The shape of the issue is plain once you put those together. The damage is done by movement, not by contact. All a tank with petrol in it amounts to is a fuel fault. After your pump has been running on that petrol, a mechanical issue has started: anything shed by a pump that is wearing travels downstream to the fuel injectors with your fuel.
Four situations our technicians see in Townsend: how bad is petrol in a diesel?
Fuelled up, not once started. The best case there can be. Being on a forecourt is what makes this the case: elsewhere, the car has been driven there to begin with. With the petrol kept in the tank alone, it's emptied and rinsed on the spot, and nothing more is needed.
Started for a moment, or only the ignition on. Petrol has left your tank and reached the filter and the fuel lines, since the fuel system has been bled. Drain, flush, see to the fuel filter: still normally simple.
A couple of miles driven, and the pump has spent each of them running on diluted fuel. Distance is only half of it; how hard it was driven matters equally. Either way this work runs to the tank, your lines, the fuel filter and clean fuel through the entire circuit. Short trips, like the school run to Haddenham Community Junior School, are one thing. Very different a second time: a run to Oxford, under 15 miles away, or some distance on the M40, under 10 miles from Townsend, where the engine kept working hard.
It complained, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone lumpy. What you are hearing is the motor signalling fuel that no longer acts like diesel. Stop on the spot — on the verge on Rosemary Lane, at the kerb, down a side road — and don't move it again. Lasting damage is very rare if a vehicle is pulled over early, and the drain and flush that still come first deal with it.
Townsend drivers and the petrol in a diesel stories they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Nothing comes out when you top up — that tank just carries more of the same mixture. That advice assumes a diesel fuel system handles petrol by percentage. It doesn't.
If anything, the opposite holds. Myth: "A newer diesel can cope with a bit of petrol." Protection counts more on current diesels, not less, because their fuel passes through more precise components at higher pressure.
"It starts, it drives, so there is no harm" — the myth that catches most drivers than any other. Feed diesel to a petrol motor and it normally will not run, and so the driver stops — and the harm stops with them. Feed petrol to a diesel and it normally fires up, idles and pulls away as if nothing happened — all while its pump is wearing. Being able to run is not proof of being fine.
An old fix for a distinct problem is behind this one. Myth: "Add some two-stroke oil and drive the vehicle home." What petrol has thinned remains diluted, and that petrol remains inside your tank anyway.
"Drain it yourself and you're sorted" — a myth, since after it has been running some petrol sits in your filter and lines, waiting to go right back through your pump at your next start. It is also really risky to drain petrol into a can at the kerbside.
How does petrol in a diesel happen?
It is seldom carelessness, and no one does it on purpose. A diesel nozzle generally will not fit a petrol vehicle, but the smaller petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error easy, and only in one direction.
When routine and the car stop matching, it occurs. Hire cars, courtesy cars, and cars that are new to you. One petrol and one diesel on the drive of the same household. A well-known forecourt with the pumps in a different order. Rushing for a train outside Haddenham & Thame Parkway and filling up en route. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver used to petrol: precisely when it happens. Throw in rain, a phone call or a back seat full of kids, and the hand does what it has always done.
How to prevent petrol in a diesel on your next fill-up around Townsend
- A green handle for unleaded and black for diesel is normal in the UK — but not on each forecourt. Go by the label on the pump, not the colour.
- The first fill in a new motor is the time to check the filler flap — on it, or on the cap, many motors state the fuel to use.
- A coloured fob or a sticker on the diesel's key does more than any amount of intending to remember, in a house with one of each.
- Before the nozzle leaves the pump the first time you fill a hired or new motor, say "diesel" out loud. Daft, perhaps, but it does the trick.
- Mistakes like this are simple to make while your mind is on something else, and so the phone goes away.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to reject a petrol nozzle, and add-on devices are available for vehicles without one. They are a backstop, not a reason to stop reading the pump.
- Spotting it mid-fill? Stop at once. A weaker mix results from less petrol inside that tank, but the next stage stays the same: don't crank it.
Townsend: already put petrol in a diesel?
Then the order of things is brief. Don't turn the ignition on, and do not start it. Ask the attendants to help you roll it away from the pump if you're still on the forecourt, whether that is Gulf or somewhere else. Then phone 0333 366 0103 and tell us what went in, about how much, and if it's run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a different fault — Townsend has a page all for it.
Townsend petrol in a diesel tasks: why one costs more than another
Four different tasks sit behind the four scenarios above — which is why there is no honest single price. What shifts your cost is mostly which of them you are in. Two things follow that: the petrol that was put in as a proportion of what your tank takes, then the place the car is in and whether our van can reach it safely.
What got in, how much, and if it has run — three queries our technicians ask before quoting, not after, for exactly that reason. Given the replies, there is a straight figure instead of a range.
About Townsend and where it is
Townsend is a suburban area in Buckinghamshire, situated inland at an elevation of 83 metres, with detached housing being the predominant type of accommodation. Townsend lies approximately 14 miles from Oxford and 39 miles from London, making it a commuter-friendly location. Townsend is surrounded by nearby places such as Fort End, Haddenham, and Church End, and has a population of around 1513 residents. Townsend is characterized by its quiet, residential atmosphere, with a mix of local amenities and rural surroundings.
Fuel drain cover in Townsend and across Buckinghamshire
The teams answering petrol in diesel call-outs in Townsend, in the HP postcode area, also work the spots near it, Fort End, Haddenham and Church End included. Our engineers drain wherever your vehicle is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
Townsend: still at the pump?
Then you're in the best place there can be. Keep it off. Call.