How Worried Should You Be? Petrol in a Diesel Car in Drybridge Hill
Unstarted? Then less worried than you likely feel. Until the ignition primes your pump, your starter turns, or the vehicle is driven, petrol in a diesel tank simply sits there and does no harm. Which means the truthful reply to that first Drybridge Hill query — "have I wrecked it?" — normally no. To leave it that way, ring Petrol in Diesel then leave the engine alone. Below, this page sets out what petrol actually does inside a diesel, how far it might have gone, and how to stop it happening to you a second time.
Inside the motor: what petrol in a diesel does
On its way through an engine, diesel does two tasks. It burns, and before it burns it lubricates. Very fine clearances go into the fuel injectors and the high-pressure fuel pump, and just your diesel running through stops their surfaces grinding together.
Petrol does the first job badly and the second not at all. The clattering comes from petrol being designed not to ignite when compressed, which is precisely 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 blend is wearing itself.
The shape of the issue is clear once you put those together. The damage is done by circulation, not by contact. Where the petrol is only inside the tank, it's an issue of fuel, nothing more. A pump that has been working on that petrol is the beginning of a mechanical one, and whatever a worn pump sheds travels on with your fuel to the fuel injectors further on.
Petrol in a diesel around Drybridge Hill: how serious is it? Four cases
Fuelled up, not once started. The best case there is. Only the tank has petrol in it, and so the task is clearing your tank and purging the system where the vehicle stands. This scenario can only truly take place at a forecourt: anywhere else, the vehicle got there by being driven.
Ignition on, or started for a moment. With the fuel system primed, the fuel lines and filter now hold petrol that came from that tank. Drain, flush, deal with the fuel filter: still usually straightforward.
The pump now worked a few miles on weakened fuel — that's what driving the vehicle meant. How hard your car was driven counts as much as how far, and this work covers the tank, the lines, the fuel filter and fresh fuel through the whole circuit. On the school run to Kyson Primary School, the miles is short. Getting as far as Colchester, under 25 miles away, makes a very different task — as does any distance on the M11, under 50 miles from Drybridge Hill, with the engine running hard all the way.
It complained, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone ragged. That's the motor telling you its fuel no longer is behaving like diesel. Stop wherever you are — the verge on Cemetery Lane, a lay-by, a side street — then leave it there. The fuel drain and flush-through still come first, and they deal with it: if a vehicle is stopped early, permanent damage is very unusual.
Myths Drybridge Hill motorists hear about petrol in a diesel
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 are left with a bigger tank, still the same mix. Percentage is not how a diesel fuel system tolerates petrol, whatever that guidance supposes.
"Current diesels can handle a little petrol" — a myth, and closer to the opposite. At higher pressure, through more precise components: that is how a newer diesel moves its fuel, so the lubrication matters more, not less.
The myth that catches drivers off guard: if it starts and drives, it must be unharmed. Feed diesel to a petrol motor and it normally won't run, so the motorist stops — and the damage stops with them. Nothing seems to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump grinds. Running isn't the same as fine.
An old workaround for a distinct fault is behind this one. Myth: "Add some two-stroke oil and drive the car home." None of what petrol thinned is put back by it — and afterwards, the tank still contains the petrol.
"Drain it yourself and you're sorted" — a myth, since after it's been running some petrol sits in the filter and lines, waiting to go right back through your pump at the next start. And, a can of petrol filled by the kerbside is truly dangerous.
How does petrol in a diesel occur?
It is rarely carelessness, and nobody does it on purpose. The forecourt makes it simple: the petrol nozzle is the smaller of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle mostly won't go into a petrol vehicle at all. So the slip runs one way.
The moment routine stops matching the car is the moment it takes place. A new vehicle, a hire car or a courtesy car. Two vehicles on one driveway, one petrol, one diesel. The pumps in a different order on a familiar forecourt. A hurried fill en route to Woodbridge with a train to catch. The first fill-up in a diesel Renault Clio after years of driving petrol is exactly the moment it happens. Add a back seat full of kids, a phone call or rain, and the hand takes over.
Preventing petrol in a diesel next time you fill up around Drybridge Hill
- The label is what counts, and so read the pump instead of the colour: in the UK unleaded handles are usually green and diesel black, but not on every forecourt.
- The first fill in a strange car is the time to check the filler flap — on it, or on the cap, plenty of motors state the fuel they take.
- Good intentions count for less than a sticker or a fob in a bright colour on the diesel's key when a house has one of each. So mark it.
- It sounds silly and it does the trick: on your first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump.
- Put your phone away. This is an easy mistake to make whilst you're thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to reject a petrol nozzle, and aftermarket devices are available for the rest. Count it as a backstop, then keep checking the pump.
- Noticing it halfway? Stop at once. A thinner mixture follows from less petrol in that tank, yet your next stage stays the same: do not start it.
Already put petrol in a diesel in Drybridge Hill?
Short and simple, then, is the order of things. Leave it unstarted, with your ignition switched off as well. Ask the attendants to help you roll it clear of the petrol pump if you're still on the forecourt, whether that's Shell or anywhere else. Call 0333 366 0103 next, with three answers — your fuel, the approximate quantity, and if it has run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost protection, make it a different fault — Drybridge Hill has a page all for it.
One petrol in a diesel task in Drybridge Hill costs more than another. Why?
A fair single price doesn't exist here: four scenarios, four separate jobs. Chiefly, the cost moves with which one you are in. Two things come after that: the petrol that got in as a share of what your tank holds, then the spot your car is in and whether our van can reach it safely.
That's why our technicians ask three queries before quoting rather than after: what was put in, how much, and if it's run. A range becomes a straight figure when the replies are in.
About Drybridge Hill itself
Drybridge Hill is a suburban area in Suffolk, situated inland at an elevation of 38 metres, and is located near the towns of Woodbridge and Colchester. Drybridge Hill is characterized by its predominantly detached housing stock, reflecting the area's residential nature. Drybridge Hill sits within a network of nearby places, including Maidensgrave and Mill Hills, and is approximately 73 miles from London.
Drybridge Hill and Suffolk: where our fuel drain cover reaches
Drybridge Hill waits in the IP postcode area, and our vans that answer petrol in diesel call-outs there work the places near it as well — Maidensgrave, Woodbridge and Mill Hills among them. A forecourt, a supermarket car park, a lay-by or your own drive are all locations our engineers work, and your vehicle doesn't need to move to us.
At the petrol pump around Drybridge Hill, still?
In that case, you couldn't be in a better spot. Keep it off. Phone.