Rassau: Put Petrol in a Diesel Car?
With the tank still carrying the petrol and your engine not yet turned over, nearly every job requires only a drain, so leave your engine off. That outcome is decided in the minutes right after the fill-up, rather than by the amount that went in. Across Rassau and the remainder of Blaenau Gwent, Petrol in Diesel drains the vehicle and flushes it where it is, whether at a roadside, on a driveway or at a forecourt. Contact us before all else begins, and you'll learn what follows from there.
Petrol in a diesel: what to do first
- As you drive, the pump and the fuel injectors wear down. That is why you do not fire it up, and why you never rely on it once it has started. The thing about petrol in a diesel specifically — the bit drivers get wrong — is that it drives off fine for the first mile or two. Diesel in a petrol engine generally won't run at all, which stops the motorist and stops the wear with them. This one lets you carry on.
- Leave the car's ignition alone too. Diesel has two tasks: it ignites, and before it combusts it greases the high-pressure fuel pump and the injectors. Petrol manages the first but not the second. Switching the ignition on is frequently enough to prime the system, which moves the petrol out of your tank and into precisely those components.
- Topping up takes out nothing. It hands you a fuller tank of the same blend, because a diesel fuel system does not cope with petrol by percentage as that guidance implies — so don't pour diesel on top to water down it. Octane is irrelevant too: super unleaded is petrol.
- A motor that hasn't shifted is the simplest one to handle, and so remain where you are if you reasonably can. Parked on the verge on Heads of the Valleys Road? Hazards on, and keep it there. A difficult spot works for us better than a started motor.
- Before you phone, get your position. Anything nearest to you with a sign on it, plus a postcode starting NP23 5 — that's what settles whether our van shows up or circles.
- Dial 0333 366 0103. Anticipate three things — what went in, about how much, and if your car has been turned over. The responses settle whatever comes after.
How far you drove is what our engineers ask about, not how long the car has been stood — and here's why. Diesel has two roles on its way through an engine: it ignites, and before burning it protects its high-pressure pump and its injectors. Petrol manages the first only. So a hurried fill on the trip in, it dawning on you around eleven, and a diesel Renault Clio standing outside Ebbw Vale Town since quarter past eight tells us those few miles were covered with the pump labouring on a fuel stripped of a great deal of its protection. Phone us and leave it just where it stands.
Petrol in your Skoda Octavia, and it takes diesel? Shopping in the boot, you at Morrisons, somewhere around Rassau? Then phone, and leave your engine out of that — not even to leave that spot. Somebody comes to you. Tank cleared, fuel lines flushed, fresh diesel in, and home you go. Light throttle over a mile pulls little, and so these are often the straightforward cases.
Twenty to nine outside the local primary school, running late, and the till receipt in your hand reads unleaded. Hazards on, ignition off, ring us. Three miles in your BMW 3 Series seems like nothing, but a diesel pump meters fuel to demand — and a frantic morning drive demands plenty.
Petrol in a diesel does its harm as a proportion, which is the reason our technicians ask at all: the same few litres sitting in a nearly empty tank make a far stronger mix than they would in a full one. And petrol is rated on how well it withstands igniting under pressure — the opposite of what a diesel wants — so a stronger blend rattles more, smokes more, goes flatter. None of which means you need an answer prepared. Almost nobody knows how full that tank was in a motor collected two days ago, and our engineers work that out on site. Do phone the hire or company firm first, though: some agreements want them to sign off the work, and that's far quicker settled before than after. Then phone us about the Mercedes A-Class close to Carmel Independent Chapel.
That sluggishness is your fuel failing to build pressure fully, not the motor packing up — and with no warning for it, vehicles in that position usually get driven a second time before anybody rings. Don't. A couple of streets is all it got: throttle gone dead, idle turned lumpy, and a diesel Peugeot 208 now waiting near St David's Church. Switch the car off then ring us.
Can petrol be taken from your diesel at the forecourt?
A large share of this job gets completed at the pump, as that is where it often kicks off. Still at Morrisons? Then that's generally where it happens. Station forecourts are everyday for us, with the permission of the site.
Before the motor has fired — the forecourt is the only location this is caught. The few seconds between seeing the till receipt and reaching for the keys settle how much requires cleaning. Everywhere other than a forecourt — a car park, a driveway, a lay-by — the vehicle was switched on and driven to get there, so fuel was drawn from the tank, through the fuel filter then into the high-pressure pump. That means the fuel lines and the fuel filter need flushing as well as the tank. It is not a disaster, and we can still put it right where the car is.
Away from the pump, the next customer can get past — so yes, let the staff help you push the car. Well worth it. Shifting the car four lengths doesn't merit cranking the engine.
Do our technicians serve your side of Rassau?
Rassau is a residential suburb, and our vans go out to the town and to anywhere around it on the usual trips: Carmeltown, Garnlydan, Blaen-y-cwm, Glyncoed and Beaufort.
Not on that list? It means nothing. The places above are only the closest few, and most places in Blaenau Gwent have a page of their own elsewhere on this site. Phone and enquire instead of guessing — borders particularly, and wherever your satnav can struggle with.
This map is the ground this page includes. We operate at the roadside, on forecourts, on driveways and at car parks over all of that, and your car never needs to travel to us.
Roadside stops across Rassau
Some drivers get no safe place to pull over at all. Set off, then realised? Landed by the verge of Stonebridge Road, or sat in some lay-by with your hazards flashing? That's a normal call here. Not an unusual one.
Stay beside the car when it's wise to wait inside, yet clear of the car when it is not. Never start up the motor to limp it somewhere handier — a diesel running on petrol will often oblige, and every mile it obliges for is pulling the mixture further into the fuel system. We will take the van to a tricky location without any trouble, and for your car that's much better than pressing on.
Run it already? Stop, then see this
The local M4 is the road which matters now, and it runs under 25 miles from Rassau. A misfuelled diesel will usually get you onto it and some distance along before anything seems wrong, while the symptoms when they arrive are normally a drop in power, an uneven idle and some smoke instead of a tidy stop.
Take the first exit that's safe, stop there, and do not start the car to reposition. Presume the worst of that on a long drive. Anything near the under 25 miles to the nearest city, and the petrol has been through the filter, through the pump, through your injectors. Mention it when you call. What our engineers bring changes.
Rassau itself
Rassau is a suburban area situated in the county of Blaenau Gwent, Wales, with a riverside setting and an elevation of 398 metres. Rassau lies near the communities of Carmeltown, Garnlydan, and Blaen-y-cwm, and is located approximately 17.9 miles from Newport. Rassau has a population of around 1163 people and is characterised by predominantly terraced housing.
What we do when our technicians arrive with you in Rassau
- Three things get established before any quote — the fuel that got in, the quantity, and whether anything has been run since. Each answer alters the work.
- That tank gets cleared of it.
- Lines rinsed, filter cleared. Whatever is left afterwards isn't the thing that created the trouble.
- Clean diesel goes in, and then the system gets bled.
- It's run with fresh diesel in it, and our engineers make sure that it's running properly.
From there, you are ready to drive away. Our technicians do everything wherever the vehicle has come to a stop, which means it never needs to go to a workshop, and if it has been noticed soon, it's very unusual for there to be lasting damage.
Rassau AdBlue removal is a different problem
Do not start it: that opening instruction applies whether what was put in was AdBlue or petrol. What changes is the problem itself. Petrol dilutes the diesel and removes the protection the fuel system relies on. AdBlue? Urea dissolved in water. Put that in with the diesel and you get rust instead, plus build-up.
Our engineers deal with both, and AdBlue removal in Rassau has its own page with the details — including why it's usually the more significant of the two.
How much is a petrol-in-diesel drain in Rassau?
One number wouldn't be honest here, since this isn't one job. These are the things that change it:
- This is the key one: whether the engine has been started, or driven.
- How much of the wrong fuel was put in, weighed against how much your tank holds.
- Whether it's petrol or AdBlue.
- Access: the vehicle's position, and whether working on it there's sensible for a van.
Tell us the vehicle, the quantity and whether it has run, and you will get a firm answer instead of a range. If it is not pressing — the car is at home and going nowhere — works too.
Rassau drivers ask us these about petrol in diesel
At a petrol station around Rassau, can you do a fuel drain there?
Yes, and it's where a fair portion of this work happens. Tell us which one you are at when you call and we will tell you whether our technicians can work there. With the site's consent we attend Tesco and the other forecourts locally all the time.
A few litres of petrol in a diesel — too much?
Proportion decides it instead of litres — and more than either, whether the engine has run. Five litres in a nearly empty tank is a separate case from five in a full one — but either way, the thing that determines how much work is required is whether that blend has been drawn through the fuel system.
I drove it after putting petrol in my diesel. Now what?
Pull over somewhere safe, switch off, and leave it off. Driving shifts the problem along — out of your tank, into your pump and injectors. People fear it a good deal more than the recovery rate warrants, mind. The one really helpful thing left to you is not restarting the car.
My warranty — does a fuel drain void it?
A manufacturer's warranty outlasts a drain and flush done to a proper standard, which is no change at all. Running a diesel on petrol is the thing likelier to cause a dispute with one, which is another reason to leave the car switched off.
Two-stroke oil in the tank, and then home?
Two-stroke oil solves a separate fault, and an old one at that. Nothing it does puts back what petrol thinned. No. Your pump still has to cope with it, as the tank still has petrol in it afterwards.
A main dealer for petrol in a diesel — essential?
You do not need one. Your car is drained and cleaned wherever it is, with no need to bring it to a dealership.
Waiting next to it?
Never turn the engine back on.
Switch it off somewhere safe and keep it off, if you have already driven it. A parked, cold car is the best place to be in, and this is recoverable from much more regularly than motorists fear.
At the kerbside, on the forecourt or at home — call-out fuel draining in Rassau and throughout Blaenau Gwent.