Morpeth: Petrol in a Diesel Car? How Worried to Be
If it has not been started, worry less than you probably are. Petrol sitting in a diesel tank does nothing to your motor until something pulls it through the system — your ignition priming the pump, your starter, or driving on its own. So the fair answer to the first question everyone in Morpeth asks, "have I ruined it?", is usually no. Leave the engine off and ring Petrol in Diesel — that keeps it like that. What petrol actually does to a diesel, how to gauge how far it has gone, and how to stop it from happening a second time: that's the remainder of this page.
Petrol in a diesel: what does it do to the engine?
Two jobs fall to diesel on its journey through a motor. Oiling comes before burning; it does both. Very fine gaps go into the fuel injectors and your high-pressure pump, and just your diesel running through stops those surfaces grinding together.
Badly at the first, not at all at the second: that's petrol. A pump working on a petrol mix is wearing itself out, because petrol is thinner 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 clattering comes.
Combined, those leave the shape of the trouble clear. It is movement that does the damage, not contact. All a tank with petrol in it amounts to is a fuel problem. Whatever a worn pump sheds goes on, carried by the fuel, into the fuel injectors downstream, which is why a pump that has been working on that petrol is where a mechanical issue begins.
How serious is petrol in a diesel? Four situations our engineers see around Morpeth
Fuelled up, not once started. The best case there can be. On a forecourt, and genuinely only there, the petrol is still limited to that tank — because everywhere else the vehicle was driven to get to it. The task is emptying and rinsing on the spot.
A moment's running, or just the ignition on. The fuel system has been bled, and so petrol has left that tank and reached the filter and the lines. Still generally straightforward: drain, flush, and the filter dealt with.
Those few miles on the road were your pump running on fuel diluted by petrol the whole way. How hard the vehicle was driven counts as much as how far, and the work takes in the tank, the lines, your filter and clean fuel through the whole circuit. A school run to St Roberts Catholic First School, Morpeth is one matter. Any mileage on the A167(M), under 15 miles from Morpeth, means the engine working hard throughout, and a run to Newcastle upon Tyne, under 15 miles away, makes a very different job as well.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone uneven. That's the motor telling you its fuel no longer is acting like diesel. Stop wherever you are — the verge on Oldgate, a lay-by, a side street — then leave it where it is. The fuel drain and flush still come first, and they sort it out: if a vehicle is stopped early, long-term damage is very unusual.
What Morpeth people get told about petrol in a diesel — and the myths in it
Myth: "Fill it the rest of the way with diesel and it will be fine." It will not. Nothing comes out when you top up — that tank simply holds more of the same mixture. That guidance assumes a diesel fuel system tolerates petrol by percentage. It does not.
If anything, the reverse is true. Myth: "A current diesel can cope with a bit of petrol." At higher pressure, through more precise components: that is how a newer diesel moves its fuel, so the lubrication counts for more, not less.
This is the one that fools motorists. Myth: "If it starts and drives, there's no damage done." A petrol engine fed diesel usually won't run, 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, which it usually does; meanwhile the pump grinds. Running is not the same as fine.
Not so: a two-stroke additive makes it safe to drive home. It was an old workaround, meant for another issue. It doesn't put back what petrol has diluted, and the petrol is still in that tank later.
Myth: "Drain your tank yourself and you are sorted." After your engine has run, some of that petrol is no longer inside your tank: it is in the filter and the fuel lines, and it goes right back through your pump at the next start. And, a can of petrol filled at the kerbside is truly hazardous.
How petrol ends up: petrol in a diesel
No one does it on purpose, and it's seldom carelessness. 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 motor at all. So the mistake runs one way.
When routine and your car stop matching, it happens. Hire cars, courtesy cars, and vehicles that are new to you. Two vehicles on one driveway, one petrol, one diesel. A forecourt you know, only with its pumps arranged differently. A train to catch, and a rushed fill en route to the nearest station. Exactly the moment it takes place: after years of driving petrol, someone fills a diesel Volkswagen Passat for the first time. The hand does what it has always done when you add rain, a phone call or a back seat full of kids.
Preventing petrol in a diesel next time you fill up around Morpeth
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most generally do. Check the pump's label; the colour is only a hint.
- The first fill in an unfamiliar car is the time to check the filler flap — on it, or on the cap, plenty of vehicles state which fuel they take.
- Label your key. In a house 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 seems silly and it works: on the first fill in a new or hired car, say "diesel" out loud before you take the nozzle off the petrol pump.
- Mistakes like this are simple to make while your mind is on something else, so your phone goes away.
- Add-on devices exist for cars without one, and some diesels are built with a filler that won't accept a petrol nozzle. Useful — but a backstop at best, never a reason to stop checking the label.
- Noticing it halfway? Stop there and then. A weaker mix results from less petrol inside your tank, but the next stage stays the same: do not fire it up.
Already put petrol in a diesel in Morpeth?
Short and simple, then, is the order of things. Do not turn your ignition on, and do not start it. Still on the forecourt, at Morrisons or anywhere else? Ask the attendants to help you roll the car clear of the pump. What went in, about how much, and if it has run: tell us those when you ring 0333 366 0103.
Say so if it was AdBlue instead of petrol: it's a different fault, with its own page for Morpeth, because AdBlue brings corrosion and deposits instead of lost lubrication.
Morpeth petrol in a diesel tasks: why one costs more than another
The four situations above are four different tasks, so no single quote for this would be fair. Chiefly, the cost shifts with which situation you're in. Two things follow that: the petrol that was put in as a share of what the tank takes, then the spot the car is in and whether a van can get to it safely.
Ahead of any quote, not after, we ask three queries: the fuel that was put in, the quantity, and whether it has run. That's why. Those replies change a range into a straight figure.
About Morpeth
Morpeth is a town situated on the River Wansbeck in Northumberland, with a mix of semi-detached housing and other residential properties. Morpeth sits at an elevation of 32 metres, near the towns of High Church, Stobhillgate, and Stobhill. Morpeth is located approximately 13.5 miles north of Newcastle upon Tyne, making it a commuter town for the city. Morpeth has a population of around 12,915 people, with a range of local amenities and services.
Across Northumberland and in Morpeth: fuel drain cover
Petrol in diesel jobs in Morpeth — part of the NE postcode area — go to vans that also cover the locations round it, High Church, Stobhillgate and Stobhill included. No need to move your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places we drain.
In Morpeth and still at the pump?
Then you're in the best spot there is. Phone, and leave it turned off.