Rhyd-y-fro: Put Petrol in a Diesel Car?
Don't start the engine. If the fuel is still inside your tank and the engine has not yet turned over, a drain is almost always all it takes — and that is decided in the following few minutes, not by how much was put in. Petrol in Diesel drains and cleans wrong-fuelled vehicles where they are, across Rhyd-y-fro and the remainder of Neath Port Talbot, on the forecourt, at the roadside or on a private drive. Contact us before anything else starts, and you will see what comes after that.
Your first five steps: petrol in a diesel
- Never start the vehicle. Started all the same? Then do not trust it. Diesel in a petrol car usually won't run, so the motorist stops and the wear ends with them. Petrol in a diesel? It starts. It idles. It moves off happily, for a few miles. Most people get that backwards. It's not fine — that fuel system is grinding every mile you drive.
- Diesel ignites, and before it burns it greases — your high-pressure fuel pump, the injectors. Petrol manages only the burning. So leave the ignition off too: turning it on is commonly sufficient to prime your system, and priming draws petrol from the tank into just those parts.
- Don't add diesel on top to water down it. A diesel fuel system will not cope with petrol by percentage the way that guidance implies, and topping up takes out nothing — it only leaves you a fuller tank of the same mixture. The grade makes no difference either: super unleaded is simply petrol.
- Sit tight if it is sensible to. Hazards on, engine off, keep the car. Wherever you have stopped — the verge on Waun Penlan, anywhere — an odd place for us trumps a started engine, and nothing is quicker for us to deal with than a vehicle that never moved.
- Check where you are before calling. A postcode starting SA8 3, and the name of whatever is nearest to you. Otherwise the technician circles rather than turning up.
- Ring 0333 366 0103. Expect three things — what got in, about how much, plus if the car has been run. Those responses decide all that comes after.
Petrol in a diesel BMW 3 Series, left outside Skewen since breakfast? The wait has cost you nothing — fuel in a tank is idle. It was the journey in that sucked weakened diesel through your pump. Phone before you move the vehicle.
Easy, these ones, and the reason is the miles: a mile at gentle throttle pulls very little of it. Petrol into a diesel Nissan Qashqai somewhere in Rhyd-y-fro, a boot full of shopping, and you stuck at Lidl — call us. Leaving that space is never worth a restart. The tank gets cleared where it waits, the lines flushed, fresh diesel in, and you head home.
Each restart primes the fuel lines and pulls more petrol through the filter and into your pump. So a misfuelled diesel Audi A4 on the zig-zags outside the local primary school is a nuisance, while the same vehicle restarted three more times to be courteous is a fuel system rather than a tank. Someone will advise you to shift the vehicle out of that gateway and sort it out later. Do not. Leave it, let people moan, and phone us.
Don't drive it home to buy yourself time. You already have it: nothing gets worse while the vehicle stands, since a diesel Mercedes C-Class parked at Pontardawe Golf Club is doing none of what it did on the way there. Your pump has stopped turning.
Ringing from near Tŷ'r Gwrhyd? Three things help us. The filler — which side of the vehicle it's on. Room for a technician alongside you, without the road being blocked. And if anything has run since the fill-up. The location itself barely counts: on-street is where our engineers work most, and we would much rather have a tight spot than a car a person has driven somewhere quicker. Then it's a drain for the Peugeot 208, a filter change where there's one worth changing, lines purged, clean fuel put round the entire circuit. By now the worst of it is in the lines and not your tank.
Can petrol be drained from a diesel on a forecourt?
It kicks off at a pump, typically. Frequently it ends at one as well. The drain generally gets done on the spot. Still on the forecourt at Tesco? Given the station's agreement, that is somewhere our engineers work, and routinely.
Nowhere else but the forecourt can this be halted with the motor still unrun. Our engineers can still deal with it where it stands, even away from the forecourt. In a car park, on a driveway or in a lay-by, the car has been fired up and moved there, and that pulled fuel through the fuel filter and into the high-pressure pump, all the way from the tank. None of that is a disaster, but the flush then has to go past the tank to the fuel lines and your filter, and the few seconds between checking the till receipt and going for the keys are what decide that.
The attendants will normally offer to push the car away from the pump so the next customer can get past. That's worth doing. Shifting it four bays does not warrant starting it.
Parts our team reach in Rhyd-y-fro
As a residential suburb, Rhyd-y-fro sees a routine visit, while the villages close by go with it on that same trip: Llangiwg and Gellygron, Craig Llangiwg and Pontardawe, Ynysmeudwy.
There are dedicated pages for the majority of places around Neath Port Talbot, and the ones listed above are merely the closest neighbours — so yours being left off the list says nothing at all about if our engineers come. Assuming is the habit to skip, above all on a boundary or anywhere a satnav gets lost. Contact us and ask.
The area this page includes appears on this map. Our technicians work by the road, at forecourts, on driveways and at car parks across all of that, and the vehicle doesn't need to come to us.
Rhyd-y-fro: broken down wherever you stopped
A chance to pull in anywhere sensible does not come to everybody. A normal call for us and not an unusual one: worked out after setting off, ended up on the verge of Commercial Road or in a lay-by with the hazards on.
Clear of the car if it is not wise to be there, beside it if it is. Never fire up the motor to nurse it somewhere handier — a diesel running on petrol will usually oblige, and every mile it obliges for is pulling that mix further into your fuel system. Driving on causes your car far more harm than a van heading out to a difficult location, and that's no bother for us.
So you've run it? Petrol in a diesel after some miles
under 5 miles out of Rhyd-y-fro, the local M4 is what matters now. A loss of power, an uneven idle, smoke: those are the signs when they appear, instead of a tidy stop — and a misfuelled diesel will often get you onto it and some way along before anything seems wrong at all.
The next safe junction is the one to take. Turn off there, then leave the restarting alone. On a longer trip — anything close to the under 10 miles to the closest city — take it the mixture has been through your filter, the pump and your injectors, and say so when you call. It changes what our engineers bring.
Where's Rhyd-y-fro?
Rhyd-y-fro is a suburban area in Neath Port Talbot, situated near the river and close to the communities of Llangiwg and Gellygron. Rhyd-y-fro has a mix of semi-detached housing and is located near Craig Llangiwg, with Swansea just 8.5 miles away. Rhyd-y-fro sits at an elevation of 109 metres, in a region of south Wales with a strong industrial heritage.
Once we arrive with you around Rhyd-y-fro: what we do
- Three things get checked before any quote — the fuel that was put in, the quantity, and whether anything has been run since. Each answer changes the work.
- Our engineers clear your tank of the polluted mixture.
- We purge the fuel lines and clear the filter, and so what's remaining in the fuel system is not what started the trouble.
- Your system gets primed, on new diesel.
- It's fired up with clean diesel in it, and we check that it's running correctly.
Your car is then ready for you to drive away. Long-term damage is very rare when it has been noticed early, and since all of it is done where the vehicle is, it never needs to be taken to a workshop.
AdBlue in the diesel tank instead, around Rhyd-y-fro?
If what went in was AdBlue rather than petrol, the first step is unchanged — never start it — yet the issue is not. Petrol does two things to diesel: dilutes it, and removes the protection the fuel system depends on. AdBlue? Urea dissolved in water. Pour that in with your diesel and you get rust instead, plus deposits.
Our technicians handle both, and AdBlue removal around Rhyd-y-fro has its own page with the detail — including why it is often the more significant of the two.
What a petrol-in-diesel fuel drain costs in Rhyd-y-fro
What changes the price is laid out below, since the job isn't one job and we can't honestly put a single figure on this page.
- Has it been run or driven? Nothing else matters for as much.
- Wrong fuel in, against what your tank holds — that ratio.
- AdBlue or unleaded, whichever was put in.
- Whether a technician can sensibly get to the vehicle and work on it, which hinges on where the car is.
Tell us what your vehicle is, how much got in, and whether your motor has run. A firm answer comes back, not a range. Motor at home, going nowhere, nothing pressing about it — is good for that.
Questions we get about petrol in diesel in Rhyd-y-fro
Can you do a fuel drain at a petrol station in Rhyd-y-fro?
Much of what our technicians do takes place nowhere else. So yes. Tell us which one you're at when you call and we will tell you if we can work there. With the station's agreement we visit another forecourt nearby and the other forecourts locally regularly.
How much petrol is too much for a diesel?
Proportion settles it rather than litres — and more than either, whether your engine has run. Five litres in a nearly empty tank is a distinct case from five in a full one — but either way, the thing that decides how much work is needed is if that blend has been sucked through the system.
I drove it after putting petrol in my diesel. What now?
Turn off somewhere sensible, and keep it that way after you stop. Not restarting it is the single most useful thing available to you now. Driving does move the problem out of the tank then into your pump and injectors, yes, and it remains salvageable far more commonly than motorists assume.
Will a fuel drain void my warranty?
A manufacturer's warranty outlasts a drain then flush done to a correct standard, which is no change at all. What is likelier to start an argument is a diesel that has been run on petrol. One more reason for your engine to remain off.
Two-stroke oil in your tank, and then home?
What petrol has diluted is not put back by two-stroke oil, which is an old workaround for a separate fault. So no. The tank still has petrol in it afterwards, and your pump still has to put up with it.
Main dealers and petrol in a diesel
There's no need to bring it to a dealership, as our technicians drain and clean the vehicle wherever it is.
You, and your vehicle, still together?
Leave the car switched off.
Turn it off somewhere sensible then keep it off, if you have already driven it. Cold and still, a motor is in the best position available — and people fear this a lot more than the recovery rate warrants.
Emptying wrongly fuelled motors, Rhyd-y-fro and the rest of Neath Port Talbot, wherever they are. Kerbside. Forecourt. Home.