New Cross: Petrol in a Diesel Car? How Worried to Be
Less than you likely are, if it hasn't been started. Everyone around New Cross starts with "have I ruined it?", and the honest answer is usually no: petrol left in that tank of a diesel stays harmless until priming, cranking or driving pulls it into the system. Keep it like that: leave your motor off and phone 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 again.
Petrol in a diesel: what does it do to the motor?
On its way through a motor, diesel does two tasks. It protects to begin with, and only then does it burn. Your high-pressure pump and the fuel injectors are designed to very fine clearances, and your diesel passing through them is what stops those surfaces from wearing against one another.
Of these two tasks, petrol handles the first poorly and the second not at all. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, leaving a pump running on the blend wearing itself. It is equally made to resist igniting under compression — the reverse of what a diesel needs — which is where you get the clattering.
Combined, those make the shape of the trouble clear. It is movement that does the harm, not contact. Any tank with petrol in it is a fuel fault. After your pump has been working on that petrol, a mechanical problem has begun: whatever is shed by a pump that's grinding is carried downstream to your injectors with the fuel.
New Cross, petrol in a diesel: four cases, from mild to significant
Fuelled, and never started: no case is better. Being on 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 is cleared and flushed on the spot, and nothing more is needed.
Started for a moment, or just the ignition on. Petrol has come out of your tank and got to the fuel filter and your lines, since your system has been primed. Drain, flush, see to the fuel filter: still usually easy.
The pump now worked a couple of miles on diluted fuel — that's what driving it does. How hard the car was driven counts as much as how far, and the work takes in that tank, the fuel lines, your filter and clean fuel through the entire system. On the school run to St Mary's Catholic Primary Academy, the miles is small. Any distance on the M54, under 3 miles from New Cross, means your engine working hard throughout, and a run to Wolverhampton, under 3 miles away, makes a very different task as well.
Driven till it complained. Rattling, a ragged idle, smoke, a throttle that has gone soft. That's your engine telling you its fuel has stopped acting like diesel. Pull up where you are — on the verge on Milton Road, at the kerb, down a side road — and do not move it. What comes first is still the fuel drain and flush-through, and that sorts it out, with permanent damage very unusual if a car is stopped early.
What New Cross people 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 mixture. Percentage is not how a diesel fuel system copes with petrol, whatever that advice assumes.
Myth: "A current diesel can cope with a bit of petrol." If anything, the reverse. A current diesel sends its fuel through finer components at higher pressure, which makes the protection matter more, not less.
"It starts, it drives, and so no harm done" — the myth that catches most drivers than any other. Feed diesel to a petrol motor and it usually won't run, so the driver 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 wears. Fine and running aren't the same thing.
An outdated workaround for a different issue is behind this one. Myth: "Add some two-stroke oil and drive it home." What petrol has thinned stays thinned, and the petrol stays in the tank anyway.
"Drain it yourself and you're sorted" — a myth, since after it has been running some petrol lies in the fuel filter and lines, waiting to go straight back through the pump on your next start. It is also really dangerous to drain petrol into a can at the kerbside.
How does petrol in a diesel happen?
No one does it on purpose, and it's seldom carelessness. The forecourt makes it easy: the petrol nozzle is the smaller of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle generally will not go into a petrol car at all. So the error runs one way.
The moment habit stops matching your car is the moment it happens. Courtesy car, hire car, or a car that is new. Households running one of each, petrol and diesel. The pumps in a different order on a well-known forecourt. A rushed fill en route to Wolverhampton with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver accustomed to petrol: exactly when it takes place. Add rain, a phone call or a back seat full of children, and the hand repeats what it has always done.
New Cross drivers: how to prevent petrol in a diesel next time
- The label is what counts, so read the petrol pump rather than the colour: in the UK unleaded handles are normally green and diesel black, but not on every forecourt.
- Inspect your filler flap. Many cars state the fuel type inside the flap or on the cap. Look at it on the first fill in a car you don't know.
- Good intentions count for less than a sticker or a fob in a bright colour on your diesel's key if a house has one of each. So mark it.
- Before the nozzle leaves the pump the first time you fuel a hired or new vehicle, say "diesel" aloud. Daft, yes, but it works.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck the phone away and keep your mind on the petrol pump.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler designed to reject a petrol nozzle, and add-on devices are available for the remainder. Treat it as a backstop, and keep checking the petrol pump.
- Spotting it halfway? Stop at once. A thinner mixture results from less petrol inside your tank, but your next step stays the same: don't fire it up.
New Cross: already put petrol in a diesel?
Then, there is only a short order of things. Don't crank it, and don't turn your ignition on. The attendants on the forecourt — whether at Texaco itself or wherever you filled up — will usually help roll it away from the petrol pump if you ask. Then phone 0333 366 0103 and tell us what went in, about how much, and whether it's run.
If it was AdBlue and not petrol, say so. That's a different problem — corrosion and deposits and not lost protection — and it has its own page for New Cross.
New Cross petrol in a diesel jobs: why one costs more than another
The four scenarios above are four separate tasks, so no single quote for this would be fair. What moves the cost is mostly which of them you're in. The share matters next, meaning how much of your tank is petrol, and then the position of your car and whether getting to it is safe for a technician.
Three questions come first, before any quote, instead of after — what was put in, how much, has it run — and this is the reason. Given the replies, you get a straight figure rather than a range.
About New Cross, for a moment
New Cross is a suburban area in the West Midlands, situated near the River Tame and close to the city of Wolverhampton. New Cross has a mix of housing types, but semi-detached homes are the most common, and the area is home to around 7270 people. New Cross is located near other residential areas, including Newbolds, Fallings Park, and Old Fallings, and is about 112.9 miles northwest of London. New Cross sits at an elevation of 153 metres, giving it a relatively high vantage point in the surrounding landscape.
Fuel drain cover across West Midlands, New Cross included
Petrol in diesel jobs in New Cross — part of the WV postcode area — go to teams that also cover the spots round it, Newbolds, Fallings Park and Old Fallings included. No need to bring the car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all spots we drain.
Still at the petrol pump around New Cross?
Then, you couldn't be in a better spot. Keep it off. Call.