Newcastle: Put Petrol in a Diesel Car?
With the tank still carrying the fuel and the motor not yet run, nearly every job needs only a drain, so keep your engine off. That result is determined in the minutes right after the fill-up, rather than by the amount that was put in. All over Newcastle and the remainder of Bridgend, Petrol in Diesel drains your car and flushes it where it stands, whether at a roadside, on a private drive or at a forecourt. Ring us before anything else starts, so you will learn what comes after that.
What to try now about petrol in a diesel
- Give a petrol engine diesel and it will typically not run at all, so the person stops there and so does the damage. Feed a diesel petrol and the car starts, it ticks over, it drives off — fine enough for a couple of miles. People have that reversed, which is the thing they get wrong about petrol in a diesel specifically. So don't start the car. And having started, don't rely on it: the fuel system is grinding while you drive.
- Turning your ignition on often primes your system, and priming is what draws petrol out of that tank and into the pump and injectors. Those are the parts diesel keeps lubricated on its way through, before it combusts. Petrol manages the burning and none of the oiling. Leave the ignition be.
- Don't put diesel on top to dilute it. A diesel fuel system will not accept petrol by percentage in the way that advice suggests, and topping up clears nothing — it simply gives you a larger tank of the same blend. The grade makes no difference either: super unleaded is just petrol.
- Stay put if it's sensible to. Hazards on, engine off, keep the vehicle. Wherever you have stopped — the verge on West Road, anywhere — an odd spot for us beats a started diesel, and nothing is easier for us to deal with than a vehicle that never shifted.
- Check where you are before ringing. A postcode starting CF31 4, and the name of whatever is next to you. Otherwise the van circles rather than turning up.
- Call 0333 366 0103. Expect three things — what was put in, approximately how many litres, plus if your car has been run. Your responses settle all that follows.
Quarter past eight, a quick fill on the road in, and you realise around eleven — by which time your diesel BMW 3 Series has been left at Bridgend for three hours. Ring us then keep the car right where it stands. The run in is the part that matters here, because diesel has two roles on its way through the engine: it burns, and before it burns it greases the high-pressure fuel pump and its injectors. Petrol handles the first and not the second. So those couple of miles were covered with your pump labouring on a fuel that had given up a lot of the protection it is built around — which is why the thing our technicians ask is how many miles you drove, not how long your car has been standing.
The awkward part is the bay, not the fuel. Vehicles either side of you, a trolley shelter behind, and from time to time a height barrier on the way in that settles whether a van can reach you at all — so when you phone from a car park like the one at Tesco, tell us how much room there's around you and which way round the vehicle is. Those our engineers attend regularly. Should there be no room to work next to the diesel Nissan Qashqai, it gets moved with the motor off, and not out of fussiness over a few seconds of running: priming happens at every start, more of the blend leaves your tank for the pump, and two shunts into a better space have gradually made a bigger job of what was merely a motor standing still.
Injection pressure is the part being lost. Petrol dilutes diesel, and weaker fuel slips past the close-fitting parts that are supposed to build that pressure, and so the further a diesel Audi A3 travelled, the less well it held. Normal on the way out and gutless on the way back is how the run to Craig-y-Parcau went, then, and the tank is where to look. Pull over somewhere sensible, turn off then ring us.
The pump rests upstream of your injectors, so whatever a worn one sheds travels downstream with your fuel — which is why we are direct about not driving on. Ring us, then leave your diesel Vauxhall Astra where it is near St Illtyds Church.
Turn off where you have stopped, and never start it to find somewhere better — close to Y Castell Newydd or anywhere at all. Knocking, a ragged idle, white smoke and a soft throttle are a misfilled diesel Ford Fiesta telling you what's wrong.
Forecourt draining for petrol in a diesel
A large portion of this job is finished at a pump, since that's where it often starts. The drain usually happens right there. Still on the forecourt at Tesco? Given the site's agreement, that is somewhere our engineers work, and routinely.
Before the motor has fired — the forecourt is the one spot it ends up caught. We can still deal with it where it is, even away from the pumps. In a car park, on a private drive or in a lay-by, the car has been fired up and moved there, and that drew fuel through the filter and into the high-pressure fuel pump, right from that tank. None of that is a catastrophe, but the flush then has to reach past your tank to the fuel lines and the fuel filter, and the few seconds between reading your receipt and going for your key are what decide that.
Staff will usually pitch in pushing it out from the pump, which lets the next driver get by. Accept the offer. Firing it just to roll four car lengths isn't.
Newcastle and the places next to it
Being a residential suburb, Newcastle gets a routine visit, and the villages nearby come with it on the same journey: Ystrad Fawr and Bridgend, Tremains and Llangewydd Court, Brynhyfryd.
Not on this list? That means nothing. The places above are just the closest few, and nearly all locations around Bridgend have a page of their own somewhere on this site. Call us to ask rather than guessing, above all where you're on the border or somewhere your satnav can't find.
This map is the ground this page covers. Every bit of it is territory we serve: a roadside, a forecourt, a drive, a car park. You never drive your car anywhere.
Stopped by the roadside anywhere in Newcastle?
Not everybody finds a safe spot to pull in. Set off, then noticed? Finished up by the verge of The Square, or parked in some lay-by with the hazards on? That is a routine call here. Not an unusual one.
Okay right there? Stay beside it. Not fine? Move out and clear of it. Every mile a diesel obliges you for on petrol draws the mix further into your fuel system — and oblige it often will, which is why the motor doesn't get restarted to limp somewhere handier. A technician heading to an inconvenient place is no bother for us, and it's far better for the vehicle than pressing on.
So you've run it? Petrol in a diesel over a few miles
under 3 miles from Newcastle, the local M4 is what counts now. Some way along, and onto it in the first place: a misfuelled diesel will frequently do both before anything seems wrong. What you get then is rarely a neat stop. Power ebbs away, the idle gets rough, and there may be smoke.
The first safe junction is the one to take. Switch off there, and leave the restarting alone. Presume the worst of it on a long trip. Anything approaching the under 25 miles to the nearest city, and the contamination has been through your filter, through the pump, through the injectors. Say so when you call. What our technicians bring changes.
Newcastle itself
Newcastle is a suburban area in Bridgend, Wales, situated on the riverside at an elevation of 47 metres. Newcastle lies near several nearby places, including Ystrad Fawr, Bridgend, and Tremains, and is approximately 17 miles from Swansea. Newcastle has a population of around 4088 people and is characterised by semi-detached housing. Newcastle is located in a region with easy access to major cities, being around 149 miles from London.
What our technicians do when we get to you around Newcastle
- We check what was put in, how much, and if your motor has run. The answers change the work, which is why we ask before giving a price.
- Your tank gets cleared completely.
- What is remaining in the system should not be what caused the issue, so your fuel lines get flushed and the filter cleared.
- The fuel system gets primed, on fresh diesel.
- Your engine is started and checked to confirm it runs properly on new diesel.
Your car is then ready for you to drive away. Long-term damage is very uncommon when it has been noticed soon, and because all of it is done where the vehicle is, it never has to go to a garage.
Newcastle AdBlue removal is a separate problem
If what got in was AdBlue rather than petrol, the first step is the same — never fire it up — yet the fault is not. The lubrication a fuel system relies on gets stripped away by petrol, which thins your diesel. AdBlue? Urea dissolved in water. Tip that in with your diesel and you get corrosion instead, plus deposits.
Both are ours. There is a separate Newcastle page for AdBlue removal, with the full story on it — including the reasons it usually turns out to be the worse of the two.
What a petrol-in-diesel fuel drain costs in Newcastle
Honestly, no single figure belongs on a page like this. The job changes. Here's what changes it:
- This is the main one: whether your engine has been run, or driven.
- Wrong fuel in, against what your tank holds — that ratio.
- Which went in: petrol or AdBlue.
- Whether our van can safely reach the car and work on it, which depends on where your vehicle is.
Tell us what your car is, how much went in, and whether the engine has run. A clear answer comes back, not a range. If it's not urgent — the car is at home and going nowhere — works too.
Questions our engineers hear about petrol in diesel around Newcastle
Can you do a fuel drain at a petrol station in Newcastle?
Yes, and it's where a big part of this work takes place. Agreement from the site is the condition. Given that, a forecourt like Applegreen is somewhere we are frequently, along with the rest of them locally — so name yours on the call and you will hear whether working there is possible.
A few litres of petrol in a diesel — too much?
Whether the engine has run counts much more, though the ratio matters too, rather than the litres. Five litres in a nearly empty tank is a different matter from five in a full one — but either way, the thing that settles how much work is required is whether that mixture has been drawn through the system.
I drove the vehicle after putting petrol in my diesel. What now?
Stop sensibly. Off. Nothing after that. Not restarting it is the single most useful thing available to you now. Driving does move the problem out of your tank and into the pump and injectors, yes, and it remains salvageable a lot more frequently than drivers fear.
Fuel drains and manufacturer warranties
It is not a modification, so a drain then flush carried out properly does not void a manufacturer's warranty. Running a diesel on petrol is the thing likelier to cause a disagreement with one, which is another good reason to leave the vehicle turned off.
Adding two-stroke oil, then driving home
No. It belongs to a distinct problem from a separate era, and petrol has weakened something no oil of that kind restores. That tank still has petrol in it afterwards, and the pump still has to cope with it.
A main dealer for petrol in a diesel — necessary?
Not at all. Our technicians drain and clean the car wherever it is, so there is no need to take it to a main dealer.
Is the vehicle still with you?
Your engine stays off.
Switch it off somewhere safe then keep it off, if you have already driven it. Cold, stationary, going nowhere: that is the best place to be in. Drivers fear this a lot more than they need to.
Throughout Bridgend and in Newcastle: call-out fuel draining, at home or on the forecourt or at the kerbside.