How Worried Should You Be? Petrol in a Diesel Car in Bridgend
Less than you probably are, if it has not been started. Petrol resting in a diesel tank does nothing to your engine till something pulls it through your fuel system — the ignition priming the pump, the starter, or driving on its own. So the honest answer to the first question everyone around Bridgend asks, "have I wrecked it?", is generally no. Keep it that way: leave your motor off and call Petrol in Diesel. What petrol actually does to a diesel, how to judge how far it has 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 once. It lubricates first, and only then does it burn. What keeps the surfaces inside your high-pressure pump and your injectors from wearing against each other is the diesel flowing through them — they are designed to very fine clearances.
Of those two jobs, petrol manages the first poorly and the second never. Being less viscous than diesel, petrol strips out the protection a fuel system needs, leaving a pump on that mixture to wear itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is where you get the rattling.
Together, those make the shape of the problem clear. Not contact but movement is what does the damage. Where the petrol is only in your tank, it's a fault of fuel, nothing more. The start of a mechanical problem is a pump that has been running on that petrol — and whatever a worn pump sheds travels on with the fuel to the fuel injectors beyond it.
Bridgend, petrol in a diesel: four cases, from mild to serious
Fuelled up, not once started. The best case there can be. Just the tank has petrol in it, so the task is draining your tank and rinsing your system where your car stands. This situation can only truly happen on 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 contain petrol that came from the tank. Usually little more than clearing, flushing and seeing to the filter, so still easy.
Those few miles on the road meant the pump labouring on fuel thinned by petrol the whole way. How hard your car was driven counts as much as how far, and the work covers that tank, your lines, the fuel filter and clean fuel through the whole system. The school run to the local primary school is one matter. Driving as far as Stirling, under 15 miles away, makes a very different job — as does any distance on the M9, under 15 miles from Bridgend, with the engine running hard the whole time.
Driven on until it protested — knocking, smoke, a ragged idle, a soft throttle. The motor is telling you your fuel is no longer acting like diesel. Stop on the spot — on the verge on Manse Lane, at the kerb, down a side road — and don't move it again. A vehicle stopped soon very rarely has long-term damage, since the drain and the flush-through, which still go first, deal with it.
Petrol in a diesel myths Bridgend drivers hear
False: topping up to full with diesel makes it fine. It doesn't. A bigger tank of the same mixture is all it gives, because topping up removes nothing. Percentage isn't how a diesel fuel system copes with petrol, however much that guidance assumes.
Not so: a current diesel copes with a bit of petrol. Rather, the reverse. At higher pressure, through more precise parts: that's how a newer diesel moves its fuel, so the lubrication matters for more, not less.
"It starts, it drives, so there is no harm" — the myth that catches most motorists than any other. Any petrol engine fed diesel generally will not run, and so the motorist stops and the damage stops with them. While the pump grinds, a diesel fed petrol normally starts, ticks over and drives away as though nothing has happened. Fine and running are not the same at all.
Not so: a two-stroke additive lets you to drive home. It is an old workaround, meant for another issue. The petrol is still in your tank after that, and whatever it has diluted isn't put back.
"Drain it yourself and you're sorted" — a myth, since after it's been running some petrol lies in the fuel filter and lines, ready to go straight back through the pump at your next start. Also, a can of petrol drained by the kerbside is genuinely risky.
How petrol ends up: petrol in a diesel
It is rarely carelessness, and no one does it on purpose. The petrol nozzle is the narrower of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly will not go into a petrol vehicle at all. The forecourt makes it simple, and the error runs one way.
The moment routine stops matching the vehicle is the moment it happens. A new car, a hire car or a courtesy car. One petrol and one diesel on the driveway of the same household. A well-known forecourt with the pumps in a different order. A train to catch, and a hurried fill on the way to Dunblane. Precisely the moment it takes place: after years of driving petrol, a driver fills a diesel Renault Clio for the first time. With rain, a call coming in, or a car full of children to deal with, your hand simply does what it has always done.
How to prevent petrol in a diesel at your next fill-up around Bridgend
- A green handle for unleaded and black for diesel is usual in the UK — but not on each forecourt. Trust the label on the pump, not the colour.
- Plenty of cars state the fuel inside your filler flap or on the cap, and so check it on the first fill in any vehicle you do not know.
- Good intentions count for less than a sticker or a fob in a bright colour on the diesel's key if a house has one of each. So label it.
- It sounds daft and it does the trick: on your first fill in a new or hired car, say "diesel" out loud before you lift the nozzle off the petrol pump.
- Thinking about something else is when this becomes an easy mistake to make, and so tuck the phone away then keep your mind on the pump.
- Some diesels come with 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 checking the pump.
- Noticing it mid-fill? Stop at once. A thinner mix results from less petrol inside that tank, yet your next step remains the same: do not start it.
Bridgend: already put petrol in a diesel?
Then the order of things is brief. Leave it unstarted, with your ignition switched off too. The attendants on the forecourt — whether at Esso itself or wherever you filled up — will usually help push it clear of the petrol pump if you ask. Then phone 0333 366 0103 and tell us what was put in, about how much, and whether it has run.
If it was AdBlue rather than petrol, say so. That is a different issue — corrosion and deposits rather than lost lubrication — and it has its own page for Bridgend.
One petrol in a diesel job around Bridgend costs more than another. Why?
The four situations above are four different jobs, so no single quote for this would be fair. The situation itself does most of the work of moving the cost. The ratio matters next, meaning how much of that tank is petrol, and then the location of the car and whether getting to it is safe for our van.
Three queries come first, before quoting, rather than after — what got in, how much, has it run — and this is the reason. A range becomes a straight figure once the answers are in.
About Bridgend
Bridgend is a suburban area situated on the riverside in Stirling, with a relatively low elevation of 73 metres. Bridgend is located near several notable towns, including Callander and Kilmahog, and is approximately 14 miles from the city of Stirling. Bridgend has a population of around 1474 people and is characterised by predominantly detached housing.
Fuel drain cover across Stirling, Bridgend included
Callander, Kilmahog and Drumvaich are among the spots near Bridgend that the same teams work, answering petrol in diesel calls across Bridgend's FK postcode area. 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.
Bridgend: still at the pump?
Then you are in the best position there is. Turned off it remains; then ring.