Fegg Hayes: Petrol in a Diesel Car? How Worried to Be
Likely less than you already are — as long as no one has started it. "Have I wrecked it?" is the first thing everyone around Fegg Hayes asks, and the honest answer is normally no, since petrol left in a diesel tank hurts nothing until it's dragged through your fuel system — by ignition priming, by the starter, or by driving. Leave the engine off then phone Petrol in Diesel — that is how you keep it that way. What petrol actually does to a diesel, how to judge how far it's gone, and how to stop it from happening a second time: that is the remainder of this page.
Petrol in a diesel: what does it do to your engine?
Passing through an engine, diesel does two things at the same time. Lubricating comes before burning; it does both. Built to extremely fine tolerances, the fuel injectors and the pump depend on the diesel flowing through them to stop their surfaces wearing against one another.
Badly at the first, not at all at the second: that's petrol. The knocking comes from petrol being made 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 out the protection your system hinges on, and any pump working on such a blend is wearing itself.
Combined, those make the shape of the trouble plain. It is circulation that does the harm, not contact. Where that petrol is only in that tank, it's an issue of fuel, nothing more. After the pump has been working on that petrol, a mechanical issue has started: whatever is shed by a pump that is wearing travels onward to your injectors with your fuel.
Four situations our technicians see around Fegg Hayes: how bad is petrol in a diesel?
Filled but not once started — as good as it gets. Being on a forecourt is what makes this the case: elsewhere, the vehicle has been driven there to begin with. With that petrol kept inside the tank alone, it's drained and rinsed on the spot, and nothing more is needed.
A brief spell of running, or just your ignition on. Petrol has come out of the tank and got to your filter and the lines, since the fuel system has been primed. Drain, flush, see to your filter: still normally simple.
Those few miles driven were the pump labouring on fuel thinned by petrol the whole way. Miles is only half of it; how hard it was driven counts just as much. Either way this work runs to your tank, the lines, your filter and fresh fuel through the whole system. Short trips, like the school run to Whitfield Valley Primary Academy, are one thing. Any mileage on the M6, under 10 miles from Fegg Hayes, means your engine working hard throughout, and a run to Stoke-on-Trent, under 5 miles away, is a very different job as well.
It complained, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone uneven. That is the motor telling you its fuel has stopped acting like diesel. Leave it wherever it has stopped: a lay-by, a quiet street, the verge on Fegg Hayes Road. The drain and flush still go first, and they deal with it: when a car is stopped quickly, long-term damage is very uncommon.
Fegg Hayes people and that petrol in a diesel myths they hear
Myth: topping up to full with diesel makes it fine. It does not. A bigger tank of the same mixture is all it gives, because topping up takes out nothing. A diesel fuel system doesn't accept petrol by percentage in the way that advice presumes.
If anything, the reverse is true. Myth: "A current diesel can cope with a bit of petrol." Protection matters more on modern diesels, not less, since their fuel runs through more precise parts at higher pressure.
"It starts, it drives, and so there is no harm" — the myth that catches most drivers than any other. Any petrol engine fed diesel usually will not run, and so the driver stops and the damage stops with them. A diesel fed petrol normally starts, idles and drives away as though nothing has happened, while your pump grinds. Fine and running are not the same thing.
An old workaround for a separate issue is behind this one. Myth: "Add some two-stroke oil and drive the car home." None of what petrol thinned gets put back by it — and later, your tank still contains that petrol.
The next start draws petrol back round the pump out of the lines and your filter, where some of that ends up after the motor has been run. That is why draining the tank yourself doesn't sort it — a myth. It's also really hazardous to drain petrol into a can by the roadside.
Why petrol in a diesel happens so easily
Carelessness is rarely the cause, and no one means to do it. The forecourt makes it simple: the petrol nozzle is the slimmer of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle mostly won't go into a petrol vehicle at all. So the error runs one way.
It takes place when habit and the car stop matching. Any motor that's new to you — hired, on loan as a courtesy car, or brand new. One petrol and one diesel on the drive of the same household. The pumps in a different order on a familiar forecourt. Fuelling up in a hurry en route to Longport, with a train to catch. Years of petrol cars behind you, a diesel Skoda Octavia in front of you on the forecourt for its first tank — that's when. With rain, a call arriving, or children to deal with, the hand just does what it always has.
Next time you fill up around Fegg Hayes: avoiding petrol in a diesel
- Read the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on every forecourt. The label is what matters.
- Inspect your filler flap. Plenty of vehicles state the fuel inside the flap or on the cap. Look at it on your first fill in any car you do not know.
- Mark the key. In a household with one of each, a coloured fob or a sticker on the diesel's key does more than any amount of intending to remember.
- It sounds silly and it works: on your first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump.
- Mistakes like this are simple to make while your mind is on something else, so your phone goes away.
- Some diesels come with a filler built to reject 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 checking the pump.
- As soon as you notice, stop: less petrol inside your tank means a weaker mix. What to do next does not change, though — still do not start the car.
Petrol already in a diesel in Fegg Hayes? Begin here
In that case, there's only a short order of things. Don't switch your ignition on, and don't start it. The attendants on the forecourt — whether at Murco Petroleum itself or wherever you filled up — will normally help push it clear of the petrol pump if you ask. Then phone 0333 366 0103 and tell us what went in, about how much, and if it's run.
If it was AdBlue and not petrol, say so. That's a different issue — corrosion and deposits and not lost lubrication — and it has its own page for Fegg Hayes.
Fegg Hayes petrol in a diesel jobs: why one costs more than another
The four situations above are four separate tasks, so no single quote for this would be fair. The scenario itself does most of the work of moving the cost. Where the car is counts too, and whether our van can safely get to it, after the ratio of petrol to what your tank holds.
That's why our technicians ask three queries before quoting instead of after: what got in, how much, and whether it's run. A range turns into a straight figure when those replies are in.
About Fegg Hayes, briefly
Fegg Hayes is a suburban area located on the outskirts of Stoke-on-Trent in Staffordshire, situated near the river and at an elevation of around 165 metres. Fegg Hayes is characterized by its semi-detached housing stock and is close to nearby places such as Great Chell and Chell Heath. Fegg Hayes has a population of approximately 4499 residents and is about 3.6 miles from Stoke-on-Trent city centre. Fegg Hayes is also relatively distant from London, at around 138.8 miles away.
Fuel drain cover across Staffordshire, Fegg Hayes included
Our vans answering petrol in diesel jobs in Fegg Hayes, in the ST postcode area, equally work the spots near it, Oxford, Great Chell and Chell Heath among them. The vehicle doesn't need to come to us: we drain at a forecourt, in a supermarket car park, in a lay-by or on your own drive.
At the pump in Fegg Hayes, still?
Then, you could not be in a better position. Switched off it stays; then ring.