Petrol in a Diesel Car in Aveton Gifford: How Worried Should You Be?
Not started? Then less worried than you probably feel. Until the ignition primes the pump, your starter cranks, or the vehicle is driven, petrol in a diesel tank just waits there and does no harm. Which makes the honest reply to that first Aveton Gifford query — "have I wrecked it?" — usually no. Keep it that way: leave your engine off and ring Petrol in Diesel. The rest of this page sets out what petrol actually does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you again.
What petrol in a diesel does to the engine
Two tasks fall to diesel on its route through a motor. Before it ignites, it protects — and then it burns. Very fine clearances are built into the injectors and the high-pressure pump, and only your diesel flowing through keeps their surfaces from grinding together.
Of those two tasks, petrol handles the first poorly and the second not at all. The clattering comes from petrol being designed not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is runnier than diesel, it strips away the protection your system rests on, and any pump running on that mixture is wearing itself.
Together, those leave the shape of the issue plain. Contact doesn't do the damage — movement does. Where the petrol is only inside your tank, it is a fault of fuel, nothing more. The start of a mechanical one is a pump that has been running on that petrol — and whatever a worn pump sheds moves on with the fuel to your injectors beyond it.
How serious is petrol in a diesel? Four situations our engineers see around Aveton Gifford
Filled up, never started. The best case there can be. Being at a forecourt is what makes this the case: elsewhere, the vehicle has been driven there to begin with. With that petrol kept inside that tank alone, it's emptied and purged right where it stands, and nothing more is needed.
A moment's running, or just your ignition on. Petrol has left that tank and reached the fuel filter and the lines, since the system has been primed. Drain, flush, deal with your filter: still normally easy.
Those few miles driven meant your pump working on fuel diluted by petrol the whole way. How hard the vehicle was driven matters as much as how far, and the work takes in your tank, the fuel lines, your filter and clean fuel through the entire circuit. Short trips, like the school run to Aveton Gifford CofE Primary School, are one thing. Very different once more: a run to Plymouth, under 15 miles away, or some miles on the M5, under 50 miles from Aveton Gifford, where the engine kept running hard.
It protested, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone ragged. What you are hearing is your engine signalling fuel that no longer runs like diesel. Stop on the spot — on the verge on Mill Lane, at the kerb, down a side road — and do not move it. A vehicle pulled over soon very rarely has lasting damage, because the fuel drain and the flush-through, which still go first, take care of it.
What Aveton Gifford drivers get told about petrol in a diesel — and the stories in it
Myth: topping up to full with diesel makes it fine. It doesn't. Nothing comes out when you top up — your tank just holds more of the same mixture. A diesel fuel system does not accept petrol by percentage in the way that advice supposes.
If anything, the reverse holds. Myth: "A current diesel can cope with a bit of petrol." Smaller components and higher pressure are how a newer diesel runs its fuel, and that makes the protection count more, not less.
"It starts, it drives, and so there is no harm" — the myth that catches more motorists than any other. Any petrol engine fed diesel normally will not run, and so the driver stops and the damage stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually does; meanwhile your pump wears. Fine and running aren't the same at all.
Myth: a two-stroke additive makes it safe to drive home. It was an old fix, supposed for another issue. That petrol is still inside that tank after that, and what it has thinned is not put back.
The next start sends petrol back round the pump out of the lines and the filter, where some of it ends up once the motor has been run. That is why draining your tank yourself doesn't leave you sorted — a myth. Emptying petrol into a can by the roadside is also truly dangerous.
How petrol ends up: petrol in a diesel
On purpose? Never. Through carelessness? Rarely, if ever. A diesel nozzle generally won't go into a petrol vehicle, but the smaller petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error simple, and only in that direction.
It takes place when routine and the vehicle stop matching. Courtesy car, hire car, or a car that is new. One petrol and one diesel on the drive of the same household. A forecourt you know, only with its pumps laid out differently. Fuelling up in a rush en route to Ivybridge, with a train to catch. Years of petrol motors behind you, a diesel Volkswagen Golf in front of you on the forecourt for its first tank — that's when. Throw in a back seat full of children, a phone call or rain, and the hand wins.
Next time you fill up around Aveton Gifford: avoiding petrol in a diesel
- Not every forecourt in the UK follows green for unleaded and black for diesel, even if most usually do. Read the pump's label; the colour is only a hint.
- Many motors state the fuel inside the filler flap or on the cap, so check there on the first fill in any motor you don't know.
- Good intentions do less than a sticker or a fob in a vivid colour on your diesel's key when a house has one of each. So mark it.
- It sounds daft and it works: on your first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the pump.
- Mistakes like this are easy to make whilst your mind is on something else, and so your phone goes away.
- Some diesels come with a filler designed to block a petrol nozzle, and devices you can add are available for cars without one. Such an inhibitor helps up to a point — as a backstop, not a reason to stop reading the pump.
- The moment you notice, stop: less petrol inside your tank means a weaker mix. What to do next does not change, though — still don't crank it.
Put petrol in a diesel around Aveton Gifford already?
In that case, there is just a short order of things. Don't crank it, and don't switch your ignition on. The staff at the forecourt — whether at Asda Express itself or wherever you filled up — will normally help roll it clear of the pump if you ask. Next, 0333 366 0103. We will ask what went in, about how much, and if it's been run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a different problem — Aveton Gifford has a page just for it.
One petrol in a diesel task around Aveton Gifford costs more than another. Why?
Four separate jobs sit behind the four situations above — which is why there is no fair single price. The situation itself does most of the work of moving the cost. Where your car is counts too, and whether a technician can safely reach it, after the share of petrol to what the tank holds.
That is why we ask three queries before pricing rather than after: what was put in, how much, and if it's run. Those answers turn a range into a straight figure.
About Aveton Gifford
Aveton Gifford is a small village in Devon, situated near the coast and close to the estuary of the River Avon. Aveton Gifford has a low elevation of around 4 metres, and its location near the sea has influenced its development. Aveton Gifford remains a quiet residential community with a mix of housing types, including terraced homes. Aveton Gifford is within commuting distance of Plymouth, which is around 14 miles away.
Across Devon and around Aveton Gifford: fuel drain cover
Aveton Gifford rests in the TQ postcode area, and our vans that answer petrol in diesel call-outs there work the locations near it as well — Icy Park, Venn and Ashford among them. We drain where the car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it does not have to come to us.
Aveton Gifford: still at the petrol pump?
Then you're in the best position there can be. Keep it switched off, then ring.