Should You Worry? Petrol in a Diesel Car in Stopsley
Unstarted? Then less anxious than you likely are. Petrol resting in a diesel tank does nothing to your motor till something pulls it through the system — your ignition priming the pump, the starter, or the drive on its own. So the honest answer to the first question everyone around Stopsley asks, "have I wrecked it?", is generally no. Leave your motor off and phone Petrol in Diesel — that is how you keep it like that. The rest of this page covers what petrol actually does to a diesel, how to tell how far it has got, and how to make sure it does not happen to you again.
Inside your engine: what petrol in a diesel really does
On its way through an engine, diesel has two tasks. It ignites, and before it ignites it protects. The high-pressure fuel pump and your injectors are built to very fine gaps, and your diesel passing through them is what stops those surfaces from wearing against each other.
The second task petrol doesn't do at all, and the first it does badly. The clattering comes from petrol being made not to ignite when compressed, which is precisely the opposite of what a diesel needs. On top of that it is runnier than diesel, it strips out the lubrication the fuel system hinges on, and any pump working on such a mixture is wearing itself.
Put these together and the shape of the trouble is clear. Not contact but movement is what causes the harm. All a tank with petrol in it amounts to is a fuel fault. A pump that has been labouring on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds moves on with the fuel to the injectors further on.
Stopsley, petrol in a diesel: four situations, from mild to major
Filled up, not once started. The best case there can be. At a forecourt, and truly only there, that petrol is still limited to that tank — because everywhere else your car was driven to get to it. The job is emptying and cleaning on the spot.
Your ignition switched on, or a brief start. Petrol has come out of the tank and got to the fuel filter and the lines, since the system has been bled. Drain, flush, see to the fuel filter: still usually easy.
Your pump now spent a couple of miles on thinned fuel — that's what driving it does. The work is your tank, the fuel lines, your filter and clean fuel through the whole circuit, and how hard the car was driven matters as much as how far. Driving the kids to Stopsley Community Primary School is one sort of trip. Any miles on the M1, under 3 miles from Stopsley, means the motor has worked hard throughout, and a run to St Albans, under 15 miles away, makes a very different job too.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone lumpy. The fuel is not behaving like diesel any more, and the motor is telling you. Leave it where it stops: a lay-by, a quiet street, the verge on Mayfield Road. Long-term damage is very unusual when a car is stopped quickly, and the drain and flush-through that still go first take care of it.
Myths Stopsley drivers hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. A fuller tank of the same mixture is all it gives, since topping up takes out nothing. The assumption behind the advice — that diesel fuel systems accept petrol by percentage — is wrong.
Myth: a modern diesel copes with a bit of petrol. If anything, the opposite. A newer diesel sends its fuel through more precise parts at higher pressure, which makes the lubrication count more, not less.
The myth that catches motorists off guard: if it starts and drives, it must be unharmed. Feed diesel to a petrol engine and it usually will not run, so the motorist stops — and the damage stops with them. Whilst the pump wears, a diesel fed petrol normally starts, idles and drives away as though nothing has happened. Fine and running aren't the same at all.
An outdated workaround for a different fault lies 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, that tank still holds that petrol.
"Drain it yourself and you're sorted" — a myth, since after it's been running some petrol lies in the fuel filter and lines, ready to go right back through your pump on the next start. Draining petrol into a can by the roadside is also genuinely dangerous.
Petrol in a diesel: how does it occur?
Carelessness is seldom the cause, and no one means to do it. A diesel nozzle mostly won't fit a petrol car, yet the smaller petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error simple, and just in one direction.
It takes place when habit and the vehicle stop matching. Hire cars, courtesy cars, and motors that are new to you. A household with one petrol and one diesel on the driveway. A well-known forecourt with the pumps in a different order. Racing for a train outside Luton and filling up en route. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that is when. Add a back seat full of children, a phone call or rain, and habit takes over.
How to avoid petrol in a diesel on your next fill-up in Stopsley
- Green for unleaded and black for diesel is normal in the UK — but not on every forecourt. Go by the label on the pump, not the colour.
- The first fill in an unfamiliar motor is the time to check your filler flap — inside it, or on the cap, plenty of vehicles state the fuel they take.
- Mark the key. In a house 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 — every time a new or hired car needs its first tank. It seems silly. It works.
- Thinking about something else is when this becomes an easy mistake to make, so put the phone away and keep your mind on the pump.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to block a petrol nozzle, and add-on devices exist for the remainder. Treat it as a safety net, then keep reading the petrol pump.
- Less petrol means a weaker blend, so stop as soon as you notice — though remembering that the next stage is unchanged. It is still not to crank it.
Already put petrol in a diesel around Stopsley?
Short and simple, then, is the order of things. Never fire it up, and don't switch the ignition on. If you're still on the forecourt — Shell or anywhere else — ask the staff to help you roll it clear of the petrol pump. Then phone 0333 366 0103 and tell us what went in, about how much, and whether it has run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a different issue — Stopsley has a page all for it.
What makes one Stopsley petrol in a diesel task cost more than the next
Four different jobs sit behind the four scenarios above — which is why there's no fair single quote. What shifts your cost is mostly which of them you're in. Two things follow that: the petrol that went in as a proportion of what the tank takes, then the spot the car is in and whether a technician can get to it safely.
Three queries come first, before quoting, rather than after — what got in, how much, has it run — and this is the reason. With those answers, you get a straight figure rather than a range.
About Stopsley
Stopsley is a suburban area in Bedfordshire, situated approximately 29 miles north of London and 10 miles south of St Albans. Stopsley sits at an elevation of around 159 metres, with nearby places including Round Green, Mangrove Green, and Wigmore. Stopsley has a population of around 7940 people, predominantly living in semi-detached housing.
Fuel drain cover across Bedfordshire, Stopsley included
Round Green, Mangrove Green and Wigmore are among the spots around Stopsley that the same teams work, answering petrol in diesel call-outs across Stopsley's LU postcode area. You need not move the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all locations where we work.
At the petrol pump around Stopsley, right now?
In that case, you could not be in a better place. Leave the vehicle switched off, then ring.