Petrol in a Diesel Car in East Dean: How Worried Should You Be?
If it hasn't been started, you can worry less than you likely are. Petrol resting in a diesel tank does nothing to the engine till something draws it through your fuel system — the ignition priming the pump, your starter, or the drive itself. So the truthful answer to the first question anyone in East Dean asks, "have I wrecked it?", is usually no. Leave the engine off and phone Petrol in Diesel — that keeps it that way. What petrol actually does to a diesel, how to gauge how far it's travelled, and how to stop it from happening again: that's the remainder of this page.
Petrol in a diesel: what does it do to the motor?
Passing through an engine, diesel does two jobs at the same time. It combusts, and before it ignites it protects. What keeps the surfaces inside the high-pressure pump and the injectors from wearing down against each other is your diesel passing through them — they are made to very fine clearances.
Poorly at the first, not at all at the second: that is petrol. A pump working on a petrol mix is wearing itself out, since petrol is thinner than diesel and strips out the lubrication your fuel system depends on. Petrol is also made to resist igniting under compression — the opposite of what a diesel wants from its fuel — and that's where the knocking starts.
Seen together, they show what shape the trouble takes. The damage is done by movement, not by contact. A tank with petrol in it is a fuel issue. The beginning of a mechanical one is a pump that has been running on that petrol — and whatever a worn pump sheds moves on with your fuel to your injectors downstream.
Four situations we see around East Dean: how bad is petrol in a diesel?
Filled but not once started — as good as it gets. Being at a forecourt is what makes this possible: elsewhere, the vehicle has been driven there to begin with. With the petrol held inside your tank alone, it's cleared and purged right where it stands, and nothing more is needed.
A brief spell of running, or merely the ignition on. The fuel system has been bled, so petrol has left that tank and got to the fuel filter and the fuel lines. Still generally easy: drain, flush, and the fuel filter dealt with.
Some miles driven, and the pump has spent every one of them running on thinned fuel. The work is that tank, the lines, the fuel filter and fresh fuel through the entire circuit, and how hard the car was driven counts as much as how far. On the school run to Pashley Down Infant School, the distance is short. A run as far as Brighton and Hove, under 25 miles away, is a very different task. So is any miles on the M23, under 50 miles from East Dean, where your engine has been working hard the whole time.
Rattling, an uneven idle, smoke, a throttle gone soft: driven till it complained. What you are hearing is your motor reporting fuel that no longer runs like diesel. Stop on the spot — on the verge on Churchfield, at the kerb, down a side road — and don't move it again. Permanent damage is very uncommon when a vehicle is stopped quickly, and the fuel drain and flush that still come first take care of it.
East Dean people and the petrol in a diesel myths they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it will be." Topping up removes nothing; it gives you a fuller tank of the same mixture. That advice supposes a diesel fuel system handles petrol by percentage. It does not.
Myth: "A modern diesel can cope with a bit of petrol." If anything, the reverse. A current diesel sends its fuel through more precise components at higher pressure, which makes the protection count more, not less.
"It starts, it drives, and so there is no harm" — the myth that trips up more people than any other. Feed diesel to a petrol motor and it usually won't run, so the motorist stops — and the damage stops with them. Whilst the pump grinds, a diesel fed petrol normally starts, ticks over and drives away as though nothing has happened. Running isn't the same as fine.
An old workaround for a different problem lies behind this one. Myth: "Add some two-stroke oil and drive it home." None of what petrol thinned is put back by it — and later, your tank still contains the petrol.
The next start draws petrol back round your pump out of your lines and the fuel filter, where some of that sits once your engine has been run. That's why draining your tank yourself doesn't sort it — a myth. It's also truly risky to drain petrol into a can by the kerbside.
Why petrol in a diesel happens so easily
A careless moment is rarely the cause, and nobody means to do it. A diesel nozzle mostly won't go into a petrol car, yet the narrower petrol nozzle goes into the filler of a diesel almost without resistance — so forecourts make this one error easy, and just in that direction.
Habit and the vehicle falling out of step is how it happens. A vehicle that's new to you — a hire car, on loan as a courtesy car, or just bought. One petrol and one diesel on the drive of the same household. A forecourt you know, but with its pumps arranged differently. A hurried fill en route to Eastbourne with a train to catch. Years of petrol vehicles behind you, a diesel Renault Megane in front of you on the forecourt for its first tank — that is when. Throw in rain, a phone call or a back seat full of children, and the hand does what it has always done.
Next time you fill up around East Dean: preventing petrol in a diesel
- Read the petrol 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.
- Inspect the filler flap. Many vehicles state the fuel inside the flap or on the cap. Look at it on the first fill in a motor you do not know.
- A coloured fob or a sticker on the diesel's key does more than any amount of meaning to remember, for a house with one of each.
- "Diesel", aloud, before you lift the nozzle — each time a new or hired car needs its first tank. It sounds daft. It does the trick.
- Put your phone away. This is an easy mistake to make while you are thinking about something else.
- Some diesels come with a filler built to refuse a petrol nozzle, and devices you can add are available for cars without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop checking the petrol pump.
- Stop as soon as you notice. Less petrol inside your tank makes a thinner blend. It does not change what to do next, which is still not to fire it up.
East Dean: already put petrol in a diesel?
Then, there's just a short order of things. Leave it unstarted, with the ignition off as well. Still at the forecourt, at Power- Old Town Service Station or anywhere else? Ask the staff to help you push the vehicle away from the petrol pump. Next, 0333 366 0103. We will ask what went in, roughly how much, and if it's been run.
Corrosion and deposits form the problem with AdBlue, where petrol means lost protection. So if it was AdBlue, say so — and read its own East Dean page.
What makes one East Dean petrol in a diesel job cost more than the next
The four situations above are four different jobs, so no single quote for this would be honest. Mostly, your cost moves with which one you're in. The proportion matters next, meaning how much of that tank is petrol, followed by the location of your car and whether reaching it is safe for a technician.
What got in, how much, and if it has run — three questions our technicians ask before costing, not after, for exactly that reason. A range turns into a straight figure when the answers are in.
About East Dean
East Dean is a small village in East Sussex, situated on the southeastern coast of England, with an elevation of around 49 metres. East Dean lies near the popular tourist spots of Birling Gap and the Seven Sisters, and is close to the villages of Friston and Crowlink. East Dean has a population of approximately 790 people, and its housing stock is predominantly made up of detached homes. East Dean is within commuting distance of Brighton and Hove, which is around 16 miles away.
Across East Sussex and around East Dean: fuel drain cover
Our vans answering petrol in diesel jobs around East Dean, in the BN postcode area, also work the spots near it, Friston, Crowlink and Birling Gap included. A forecourt, a supermarket car park, a lay-by or your own driveway are all places we drain, and the vehicle doesn't need to come to us.
East Dean: still at the pump?
The best spot there is, then — that's where you are. Switched off it stays; then call.