Hampsthwaite: Petrol in a Diesel Car? How Worried to Be
Provided it hasn't been started, worry less than you probably are. "Have I wrecked it?" is the first question everyone in Hampsthwaite asks, and the honest answer is generally no, because petrol left in a diesel tank hurts nothing till it's drawn through the system — by ignition priming, by your starter, or by driving. To leave it like that, ring Petrol in Diesel and leave your motor alone. What petrol really does to a diesel, how to judge how far it has gone, and how to keep it from happening again: that's the remainder of this page.
The engine and petrol in a diesel: what happens
Diesel has two jobs on its way through a motor. It combusts, and before it ignites it protects. The high-pressure pump and your injectors are made to extremely fine tolerances, and your diesel passing through them is what stops those surfaces from grinding against each other.
Petrol does the first task badly and the second not at all. A pump running on a petrol mixture is wearing itself out, because petrol is runnier than diesel and takes away the protection the fuel system depends on. Petrol is also made to resist igniting under compression — the reverse of what a diesel wants from its fuel — and that's where the rattling comes.
Put those together and the shape of the issue is plain. Contact doesn't do the damage — circulation does. Petrol in the tank is a fuel issue. After the pump has been running on that petrol, a mechanical issue has begun: anything shed by a pump that's wearing is carried downstream to the injectors with your fuel.
Four situations we see around Hampsthwaite: how serious is petrol in a diesel?
Filled up, not once started. The best case there can be. Just the tank has petrol in it, and so the job is draining the tank and purging your system where your car stands. This situation can only really occur on a forecourt: anywhere else, the car got there by being driven.
Started for a moment, or just your ignition on. Petrol has come out of the tank and reached the filter and the fuel lines, because your system has been bled. Normally nothing more than draining, flushing and seeing to the fuel filter, and so still straightforward.
Those few miles on the road meant the pump labouring on fuel diluted by petrol throughout. The work is your tank, the lines, your filter and clean fuel through the entire system, and how hard the vehicle was driven counts as much as how far. On the school run to Hampsthwaite Church of England Primary School, the mileage is short. Any miles on the A1(M), under 10 miles from Hampsthwaite, means the engine working hard throughout, and a run to Ripon, under 10 miles away, makes a very different job as well.
It protested, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone uneven. That's the motor telling you its fuel has stopped acting like diesel. Stop on the spot — on the verge on Hollins Lane, at the kerb, down a side road — and don't move it again. A vehicle stopped early very rarely has permanent damage, because the fuel drain and the flush-through, which still come first, take care of it.
Stories Hampsthwaite people hear about petrol in a diesel
Myth: topping up to full with diesel makes it fine. It doesn't. Nothing is removed when you top up — the tank just holds more of the same blend. The idea behind the guidance — that diesel fuel systems tolerate petrol by percentage — is wrong.
If anything, the reverse holds. Myth: "A modern diesel can cope with a bit of petrol." A newer diesel sends its fuel through finer parts at higher pressure, which makes the protection matter more, not less.
"It starts, it drives, and so no harm done" — the myth that trips up more drivers than any other. Feed diesel to a petrol motor and it generally will not run, and so the motorist stops — and the harm stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile the pump grinds. Fine and running are not the same at all.
Myth: "Add some two-stroke oil and drive the car home." It is an old fix for a different fault. What petrol has weakened remains weakened, and the petrol stays in your tank regardless.
"Drain it yourself and you're sorted" — a myth, because after it has been running some petrol sits in the filter and lines, ready to go right back through the pump on the next start. Also, a can of petrol filled at the kerbside is genuinely dangerous.
How does petrol in a diesel occur?
On purpose? Never. Through carelessness? Seldom, if ever. The forecourt makes it easy: the petrol nozzle is the slimmer of the two, and it slips into a diesel filler with almost no resistance, while a diesel nozzle generally won't go into a petrol car at all. So the mistake runs one way.
When routine and the vehicle stop matching, it happens. A vehicle that's new to you — a hire car, on loan as a courtesy car, or brand new. A household with one petrol and one diesel on the drive. A forecourt you know, but with its pumps laid out differently. A train to catch, and a hurried fill en route to Harrogate. Exactly the moment it takes place: after years of driving petrol, someone fills a diesel Renault Megane for the first time. With rain, a call arriving, or children to deal with, the hand simply does what it has always done.
Hampsthwaite drivers: how to avoid petrol in a diesel next time
- Read the petrol pump, not the colour. In the UK unleaded handles are normally green and diesel black, but not on every forecourt. The label is what matters.
- Check the filler flap. Plenty of motors state the fuel inside the flap or on the cap. Look at it on your first fill in a car you don't know.
- Good intentions do less than a sticker or a fob in a bright colour on the diesel's key when a house has one of each. So label it.
- Before the nozzle leaves the petrol pump the first time you fuel a hired or new vehicle, say "diesel" out loud. Silly, yes, yet it works.
- Mistakes like this are easy to make whilst your mind is on something else, so the phone goes away.
- Some diesels have a filler built to block a petrol nozzle, and devices you can add exist for vehicles without one. Such an inhibitor helps up to a point — as a safety net, not a reason to stop reading the petrol pump.
- Spotting it halfway? Stop there and then. A thinner mixture results from less petrol in your tank, yet your next stage remains the same: do not start the car.
Petrol already in a diesel in Hampsthwaite? Start here
Then, there's only a short order of things. Do not turn the ignition on, and do not fire it up. Yet on the forecourt, at Shell or anywhere else? Ask the attendants to help you roll it clear of the petrol pump. Then phone 0333 366 0103 and tell us what got in, roughly how much, and whether it has run.
Say so if it was AdBlue instead of petrol: it's a different fault, with its own page for Hampsthwaite, since AdBlue brings corrosion and deposits rather than lost protection.
Hampsthwaite petrol in a diesel jobs: why one costs more than another
There is no fair single quote for this, because the four situations above are four different jobs. Chiefly, your cost shifts with which one you are in. Two things follow that: the petrol that went in as a proportion of what the tank holds, then the place your car is in and whether a van can reach it safely.
That's why our engineers ask three questions before quoting rather than after: what went in, how much, and if it's run. The answers change a range into a straight figure.
About Hampsthwaite itself
Hampsthwaite is a village situated on the banks of the River Nidd in North Yorkshire, with a mix of rural and riverside landscapes. Hampsthwaite has a relatively low elevation of 72 metres above sea level and is located near the cities of Ripon and Harrogate. Hampsthwaite is characterized by its predominantly detached housing stock, reflecting its rural setting. Hampsthwaite is also close to nearby villages such as Swincliffe, Clint, and Rowden.
Hampsthwaite and North Yorkshire: where our fuel drain cover reaches
Petrol in diesel jobs in Hampsthwaite — part of the HG postcode area — go to teams that also cover the spots around it, Swincliffe, Clint and Rowden among them. Our engineers drain wherever your car is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
At the pump around Hampsthwaite, still?
Then you're in the best place there is. Turned off it stays; then ring.