Put Petrol in a Diesel Car in Rhyd-y-car?
With your tank still holding the petrol and your engine not yet started, nearly every job takes only a drain, so keep the engine off. That result is settled in the minutes right after the fill-up, and not by the amount that was put in. Across Rhyd-y-car and the rest of Merthyr Tydfil, Petrol in Diesel drains your car and flushes it where it is, whether by a roadside, on a drive or at a forecourt. One call to us will be sufficient: our technicians shall show you what comes from here. Make that first.
Now what? Petrol in a diesel, step by step
- As you drive, the pump and the fuel injectors suffer. This is why you never fire it up, and why you never rely on it once it has started. The thing about petrol in a diesel especially — the part motorists get wrong — is that it drives away happily for the first mile or two. Diesel in a petrol motor generally can't run at all, which stops the driver and stops the wear with them. This one lets you drive on.
- Diesel ignites, and before it combusts it greases — your injection pump, its injectors. Petrol does only the burning. So leave the car's ignition be also: turning it on is often all it takes to prime your system, and priming moves petrol from your tank into precisely those components.
- Don't add diesel on top to thin it. A diesel fuel system will not accept petrol by percentage in the way that guidance presumes, and topping up gets rid of nothing — it simply hands you a bigger tank of the same mixture. The grade makes no difference either: super unleaded is just petrol.
- Wait where you are if you safely can. A vehicle that has not moved is the easiest one to sort out, and we'd much rather come to an odd location than have it started. If you're stopped on the verge on A4102, turn the hazards on and keep the car there.
- Know where you are before ringing. A postcode starting CF48 1, and the name of whatever is closest to you. Otherwise the technician circles instead of showing up.
- Dial 0333 366 0103. Let us know what was put in, roughly how many litres, plus if your car has fired. Those three details shape the full visit.
Clearing petrol from your diesel at the forecourt
The job starts at a forecourt, generally. Regularly the work finishes at one as well. If you're still at the forecourt at Applegreen, that's typically where this drain happens — our technicians work on station forecourts routinely, with the station's consent.
A filling station is the one setting it gets spotted before the motor has fired. We can still put it right where it sits, even away from the pumps. In a car park, on a driveway or in a lay-by, your car has been fired up and moved there, and that drew fuel through your filter and into the high-pressure pump, all the way from that tank. None of that is a calamity, although the flush then has to reach past that tank to your lines and the fuel filter, and the few seconds between reading your receipt and reaching for your key are what settle that.
Away from the pump, the next motorist can get by — so yes, let the attendants help you push the car. Worth it. Four car lengths isn't worth a restart.
Service around Rhyd-y-car
These same trips get us to Cae-draw, Thomas Town, Merthyr Tydfil, Twynyrodyn and Glebeland along with Rhyd-y-car, which is a residential suburb.
Not on this list? It means nothing. The names above are simply the nearest few, and the majority of locations around Merthyr Tydfil have a page of their own somewhere on our site. Ring us and enquire instead of assuming — boundaries especially, and wherever your phone can struggle with.
The ground this page includes appears on this map. The lot is territory our technicians cover: a kerbside, a forecourt, a driveway, a car park. You don't move the vehicle anywhere.
Your diesel Audi A4 will have seemed completely ordinary on the way back from the local primary school. They all do, and that's the snag with petrol in a diesel instead of the other way round. Put diesel in a petrol car and it usually won't run, and so the driver stops and the harm stops with them. Put petrol in a diesel and it fires up, ticks over and moves off as though nothing has happened — all the while the high-pressure pump does its work without the lubrication your fuel is meant to be giving. Nothing tells you, since from behind the wheel there is nothing to warn you about. Ring us with about how far you drove and how hard you drove it; the second answer counts more than the first.
Simple job, this one — until somebody takes it home. A diesel Ford Focus parked at King Brychan with petrol in that tank loses nothing by sitting there overnight, so park the car then phone us once it's light. Expect a query about that drive there, though. Short and cold is exactly where petrol battles to burn, and what will not burn can slip past the rings then into the oil.
Do not drive it home to buy yourself time. You already have it: nothing gets worse while your car sits, because a diesel Mercedes C-Class parked at The Wern is doing none of what it did on the way there. The pump has stopped turning.
Clattering, an uneven idle, white smoke, a throttle gone limp. That is a misfuelled diesel Peugeot 3008 telling you what is wrong. Turn off where you have stopped, close to Merthyr Tydfil Leisure Centre or anywhere else, and do not restart the vehicle to find a better place.
What takes place next is the trouble. The engine straight away pulls the petrol still waiting in the filter and the feed lines back round through your pump a second time, as draining a tank does nothing about fuel that has already left it. Drain it then put clean diesel in, somebody certain will tell you — and that suggestion is half right, as do it to a diesel BMW 1 Series parked up, Vue Merthyr Tydfil say, and the thing starts, which is what makes it sound plausible. Phone us instead. Our technicians flush the circuit and take the fuel filter off where your vehicle has a serviceable one, and that is the difference between your car being repaired and your car simply starting.
Rhyd-y-car: broken down where you stopped
Not everybody gets a safe spot to stop. Hazards flashing at a lay-by somewhere, or pulled onto the verge of Cae'r Wern since you realised after setting off — our technicians take that call so often that it is the normal kind.
Remain beside the motor if it's safe to be inside, and out of the vehicle if it's not. It will often oblige. A diesel running on petrol limps along quite willingly, and that is the catch: start it up to reach somewhere handier and that blend goes further into your fuel system with every mile driven. We will take the van to an inconvenient spot without any bother, and for the car that's a lot better than carrying on.
A few miles on petrol in a diesel: now what?
Here is where the local M4 comes in — under 25 miles from Rhyd-y-car. A loss of power, a lumpy idle, some smoke: those are the symptoms when they come, rather than a tidy stop — and a misfilled diesel will often get you onto it and some distance along before anything feels wrong at all.
Take the next junction that's sensible, pull up there, and don't start the car to reposition. Suppose the worst of it on a long run. Anything approaching the under 25 miles to the nearest city, and the mixture has been through the filter, through your pump, through the injectors. Say so when you call. What our engineers bring differs.
A little about Rhyd-y-car
Rhyd-y-car is a suburban area in Merthyr Tydfil, situated near the river and surrounded by nearby places such as Cae-draw and Thomas Town. Rhyd-y-car has a population of approximately 2826 people and is characterised by predominantly terraced housing. Rhyd-y-car sits at an elevation of 170 metres, with the nearest city being Newport, located 19.5 miles away. Rhyd-y-car is part of the wider Merthyr Tydfil area, which is located 140.4 miles from London.
The call-out in Rhyd-y-car, step by step
- We ask first, price after. What was put in? How much? Has the engine run? Those answers shape what the work really is.
- Our engineers empty the tank of all the tainted mixture.
- What is left in your system should not be what caused the issue, so the fuel lines get purged and your filter cleaned.
- Your system gets bled, on clean diesel.
- Our technicians turn it on and make sure it runs correctly on clean diesel.
From that point, you are ready to pull away. There is no need for a garage at any stage, because the work is all done where the car is, and when it is noticed early, permanent damage is very uncommon.
A distinct matter: AdBlue in a diesel tank around Rhyd-y-car
AdBlue instead of petrol? Then the first rule is unchanged — your engine remains off — whereas the problem underneath it's a different one altogether. Petrol does two things to diesel: thins it, and takes away the lubrication the fuel system relies on. Corrosion and residue are what a diesel tank gets instead, because AdBlue is urea dissolved in water.
Frequently the more serious of the two, AdBlue — and the full story lives on its own Rhyd-y-car page. Both are ours to handle.
Paying for a petrol-in-diesel fuel drain in Rhyd-y-car
One price would not be fair here, since this isn't one job. These are the things that change it:
- Started? Driven? Either answer counts more than anything else on this list.
- Wrong fuel in, against what your tank holds — that ratio.
- Which was put in: petrol or AdBlue.
- Where is it? And can a technician get to it and work there sensibly?
The car, the amount, whether it has run — give us those and the answer comes back clear instead of as a range. If it isn't pressing — the car is at home and going nowhere — works too.
Petrol in diesel questions from Rhyd-y-car motorists
I'm on a forecourt around Rhyd-y-car. Can you drain the car on the spot?
A good part of this work gets done there, so yes. Our engineers attend Esso and the other forecourts nearby routinely, with the station's consent — tell us which one you're at when you ring and we will tell you whether our engineers can work there.
A couple of litres of petrol in a diesel — too much?
It depends on the proportion instead of the litres, and much more on whether your engine has run. What decides how much work is required is whether that blend has been sucked through the system — because although five litres in a nearly empty tank is a different case from five in a full one, either way that's the question.
I drove the car after putting petrol in my diesel. What now?
Stop somewhere sensible, switch off, then leave it off. Driving takes the problem along — out of that tank, into the pump and injectors. Motorists fear it a good deal more than the recovery rate warrants, mind. The one really helpful thing left to you is not restarting it.
Fuel drains and manufacturer warranties
A drain then flush carried out correctly is not a modification and doesn't invalidate a manufacturer's warranty. An argument over a warranty is likelier to come from running a diesel on petrol — so leave it turned off.
Could I put some two-stroke in and just drive?
No. It belongs to a distinct fault from a different era, and petrol has weakened something no oil of that kind restores. Petrol stays in that tank later on, whatever else goes in, and your pump gets no break from it.
Do I need a main dealer for petrol in a diesel?
Wherever your car is, we drain and clean it there, so a trip to the main dealer doesn't come into it.
Standing next to it?
Do not switch the engine on again.
Driven it already? Then somewhere sensible, stop, switch off, and no restarting the car later. Cold and still, a car is in the best place available — and motorists fear this far more than the recovery rate warrants.
Clearing wrongly fuelled vehicles, Rhyd-y-car and the rest of Merthyr Tydfil, wherever they are. Kerbside. Forecourt. Home.