Petrol in a Diesel Car in St Johns Common: How Worried Should You Be?
Less than you likely are, if it has not been started. Until the ignition primes the pump, the starter cranks, or your vehicle is driven, petrol in a diesel tank just rests there and does nothing. Which makes the truthful reply to that first St Johns Common query — "have I ruined it?" — usually no. Leave the motor off and ring Petrol in Diesel — that is how you keep it like that. The remainder of this page covers what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you again.
Inside the engine: what petrol in a diesel does
Two tasks fall to diesel on its route through a motor. It combusts, and before it combusts it lubricates. Extremely fine tolerances are built into the injectors and the high-pressure fuel pump, and just your diesel running through keeps their surfaces from grinding together.
Badly at the first, not at all at the second: that is petrol. It's thinner than diesel and strips away the protection your fuel system hinges on, and so a pump running on a petrol blend is a pump wearing itself. And petrol is made to resist igniting under compression, which is the opposite of what a diesel needs from its fuel. That is where the rattling comes from.
Put these together and the shape of the issue is clear. Contact doesn't do the harm — circulation does. All a tank with petrol in it amounts to is a fuel issue. The start of a mechanical one is a pump that has been working on that petrol — and whatever a worn pump sheds travels on with your fuel to your injectors beyond it.
St Johns Common, petrol in a diesel: four situations, from mild to major
Filled but never started — as good as it gets. Being at a forecourt is what makes this the case: elsewhere, the car has been driven there to begin with. With the petrol kept inside the tank alone, it is emptied and rinsed right where it stands, and nothing more is needed.
A brief spell of running, or merely the ignition on. The system has been primed, and so petrol has left that tank and got to your filter and the lines. Drain, flush, see to the filter: still normally easy.
Your pump now worked a couple of miles on diluted fuel — that is what driving the vehicle meant. The work is the tank, the fuel lines, the fuel filter and fresh fuel through the whole system, and how hard your car was driven matters as much as how far. On the school run to The Gattons Infant School, the mileage is small. Very different a second time: a run to Brighton and Hove, under 10 miles away, or some distance on the M23, under 10 miles from St Johns Common, where the motor never stopped working hard.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone lumpy. The fuel is not behaving like diesel any more, and your motor is telling you. Leave it where it has stopped: a lay-by, a side street, the verge on West Street. Permanent damage is very rare when a car is stopped soon, and the drain and flush-through that still come first sort it out.
What St Johns Common motorists get told about petrol in a diesel — and the myths in it
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 mix. That advice presumes a diesel fuel system tolerates petrol by percentage. It doesn't.
"Current diesels can handle a little petrol" — a myth, and closer to the reverse. Protection counts more on modern diesels, not less, because their fuel passes through finer parts at higher pressure.
This is the one that catches drivers. Myth: "If it starts and drives, there's no damage done." A petrol engine fed diesel normally won't run, so the driver stops and the harm stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump wears. Fine and running aren't the same at all.
Myth: a two-stroke additive lets you to drive home. It is an old fix, supposed for another fault. What petrol has diluted stays weakened, and that petrol stays inside the tank regardless.
"Drain it yourself and you're sorted" — a myth, because after it has been running some petrol lies in the fuel filter and lines, ready to go right back through your pump at the next start. It is also truly hazardous to drain petrol into a can by the kerbside.
Why petrol in a diesel happens at all
It is seldom carelessness, and nobody does it on purpose. One way only, because of the nozzles: the narrower petrol one slips inside a diesel filler with almost no resistance, whereas the diesel one generally will not fit a petrol vehicle. That is how the forecourt makes it simple.
When habit and the car stop matching, it takes place. A new car, a hire car or a courtesy car. One petrol and one diesel on the drive of the same household. The pumps in a different order on a well-known forecourt. Fuelling up in a hurry on the way to Burgess Hill, with a train to catch. Precisely the moment it occurs: after years of driving petrol, a driver fills a diesel Volkswagen Golf for the first time. Add a back seat full of children, a phone call or rain, and habit takes over.
St Johns Common motorists: how to prevent petrol in a diesel next time
- Check the pump, not the colour. In the UK unleaded handles are generally green and diesel black, but not on each forecourt. The label is what counts.
- Many vehicles state the fuel inside the filler flap or on the cap, so check there on the first fill in any car you do not know.
- One of each in the home? Mark the key to your diesel — a coloured fob, a sticker — since intending to remember isn't enough.
- It sounds daft and it does the trick: on the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump.
- Tuck the phone away. This is an easy mistake to make whilst you're thinking about something else.
- A misfuel inhibitor helps, up to a point. Some diesels have a filler designed to reject a petrol nozzle, and add-on devices exist for vehicles without one. They are a safety net, not a reason to stop checking the pump.
- Less petrol means a weaker blend, so stop as soon as you realise — while remembering that your next stage is unchanged. It is still not to start the vehicle.
Already put petrol in a diesel around St Johns Common?
In that case, there is just a short order of things. Leave it unstarted, with the ignition off as well. If you are still on the forecourt — Shell or anywhere else — ask the attendants to help you roll the vehicle clear of the pump. Next, 0333 366 0103. We'll ask what got in, about how much, and if it's been run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost lubrication, make it a separate problem — St Johns Common has a page just for it.
One petrol in a diesel job around St Johns Common costs more than another. Why?
A fair single price does not exist here: four scenarios, four separate jobs. What moves the cost is mostly which of them you are in. The ratio counts next, meaning how much of your tank is petrol, followed by the position of your car and whether getting to it is safe for a technician.
Three questions come first, before quoting, instead of after — what was put in, how much, has it run — and that is the reason. A range turns into a straight figure when those replies are in.
About St Johns Common, for a moment
St Johns Common is a suburban area in West Sussex, situated near the River Adur and characterised by its terraced housing. St Johns Common sits at an elevation of 41 metres, with views of the surrounding countryside and the South Downs. St Johns Common is located near several other residential areas, including Burgess Hill and Goddards Green, and is within commuting distance of Brighton and Hove. St Johns Common has a population of approximately 8320 residents.
Fuel drain cover across West Sussex, St Johns Common included
St Johns Common sits in the RH postcode area, and our vans that answer petrol in diesel jobs there work the locations near it as well — Burgess Hill, Abbotsford and Goddards Green among them. We drain wherever the car is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
At the pump in St Johns Common, right now?
In that case, you could not be in a better position. Ring, and keep it turned off.