Put Petrol in a Diesel Car in Wergs? Don't Start It
With the tank still carrying the fuel and your engine not yet run, almost every job takes only a drain, so keep the motor off. That outcome is determined in the minutes right after filling up, rather than by the amount that got in. Across Wergs and the rest of West Midlands, Petrol in Diesel drains your car and flushes it where it is, whether at a roadside, on a driveway or at a forecourt. Call us so our engineers shall tell you what follows after that before you do anything else.
Your next five minutes: petrol in a diesel
- Feed a petrol engine diesel and it will normally refuse to run at all, and so the person stops there and so does the harm. Feed a diesel petrol and the car starts, it idles, it drives off — fine enough for a few miles. Drivers have that muddled, which is the bit they get wrong about petrol in a diesel specifically. So don't fire it up. And having started, do not believe it: the fuel system is wearing while you drive.
- Leave the ignition off as well. Diesel has two tasks: it combusts, and before it combusts it protects your high-pressure pump and the injectors. Petrol does the first but not the second. Switching the car's ignition on is often all it takes to prime that system, which carries the petrol out of that tank then into exactly those components.
- That guidance assumes a diesel fuel system copes with petrol by percentage. It doesn't. Add diesel on top and nothing at all is taken out; what you have is a fuller tank of the same mix. And no, the octane makes no difference — super unleaded is simply petrol.
- Stay where you are if you reasonably can. A vehicle that has not shifted is the simplest one to sort, and we would sooner drive to an odd place than have it started. If you're parked on the verge on Wergs Drive, put your hazards on then keep it there.
- Before you ring, have your whereabouts. Anything next to you with a label on it, plus a postcode that starts WV6 8 — that's what determines whether our van turns up or circles.
- Call 0333 366 0103. Say what went in, roughly how much, and if the engine has fired. These three replies decide your whole visit.
Can petrol be taken out of your diesel at a forecourt?
The work kicks off at a pump, typically. Often enough the job finishes on site too. The drain usually gets done right there. Still on the forecourt at Sainsbury's? Given the station's consent, that is somewhere our engineers work, and often.
At a garage, the mistake is spotted with your motor never started, and no place else manages it. Everywhere else — a car park, a drive, a lay-by — the car was fired up and moved to get there, which means fuel was drawn from the tank, through the filter and into your high-pressure pump. That's not a catastrophe, and we can still put it right where it is. It does mean your lines and the fuel filter need rinsing as well as your tank, and that is settled by the few seconds between reading your receipt and reaching for the keys.
Push the vehicle out of the way if the staff volunteer, and they usually will. The next driver gets past the pump, and that's worth doing. Starting it to roll four vehicle lengths is not.
We are in car parks like the one outside Sainsbury's all the time, and it is almost never the fuel that complicates them. It is the bay. Cars both sides. Trolleys stacked up behind. Occasionally a height bar at the entrance, which decides whether a technician gets to you at all. So tell us how penned in you are when you phone, and which way the car is pointing. If there is no room to work beside your Peugeot 308, our engineers roll it without the motor. That's not fussiness over a handful of seconds: starts prime things, blend comes out of your tank on to your pump, and a vehicle shifted twice for a better spot is silently a worse job than one nobody touched.
Your diesel Nissan Qashqai will have felt entirely usual on the way back from Woodthorne Primary School. They do, and that is the catch with petrol in a diesel instead of the other way round. Put diesel in a petrol motor and it mostly won't run, so the person stops and the damage stops with them. Put petrol in a diesel and it starts, ticks over and drives off as though nothing has happened — all while your high-pressure pump works without the lubrication the fuel is supposed to be giving. Nothing tells you, because from the driver's seat there is nothing to alert you about. Phone us with about how far you drove and how hard you worked it; the second one matters more than the first.
None of that is the motor failing. That is the part worth hearing, and it is why the ordinary Wergs Golf Club call ends better than it sounds: a diesel Ford Kuga drives out there without complaint, comes back with the power gone, the idle uneven and maybe a little smoke, and the cause is the fuel no longer acting like diesel. Diesel has to be thick enough to seal the close-fitting components it passes through; petrol weakens it; and a diesel injection system is hydraulic as much as chemical, needing the fuel to hold pressure and not only to burn. So pressure that should build and stay built bleeds past gaps, delivery turns up weaker and later and less even than built, and all of that stops once the fuel is sorted.
Hire car or company car? Phone them before you ring us — some contracts want the hire firm to sign off the work, and sorting that out first is a great deal faster than sorting it later on. Then phone us about the Volvo XC60 by Clock Tower, and do not worry that you can't say how full your tank was. Almost no one can, in a car they collected two days ago, and our engineers work it out there. The reason our engineers ask is that petrol in a diesel does its damage as a ratio: the same few litres in a nearly empty tank is a far stronger mix than in a full one. Petrol is rated on how well it withstands igniting under pressure, which is the opposite of what a diesel needs — so the stronger that mixture, the more it knocks, smokes and goes flat.
By now that tank is the least of it. Run a diesel and that blend goes into the filter, into your lines, into your pump, into the rail — and none of that leaves with that tank contents. A diesel Mercedes GLC that got close to Perton Civic Centre wants its system purged. Draining is not the same thing.
Wergs and the villages beside it
These same runs take us to Tettenhall, Perton, Stockwell End, Palmers Cross and Claregate along with Wergs, which is a residential suburb.
Our technicians still come. The names above are merely the nearest neighbours, and a page is there for most locations around West Midlands, and so an absence from the list is not an absence from our coverage. Assuming is the habit to skip, particularly on a boundary or anywhere a satnav goes wrong. Call us and check.
The map marks the area this page covers. The vehicle never needs to move to us. We work throughout every bit of it — roadside, forecourts, driveways, car parks.
Kerbside call-outs across Wergs
Not everybody gets a safe place to pull in. Set off, then noticed? Finished up on the verge beside Chatsworth Gardens, or parked in some lay-by with the hazards flashing? That is a routine call here. Not an unusual one.
Whether you remain beside the car or move away from it turns on whether staying there is sensible. Do not restart it to reach a safer place. It will go — a diesel on petrol normally obliges — and each mile of obliging pulls the blend deeper into your fuel system. We'll send the van to an inconvenient spot without any bother, and for the vehicle that's far better than driving on.
Already driven it? Petrol in a diesel after some miles
The local M54 is the one which matters here, and it runs under 3 miles from Wergs. A drop in power, a lumpy idle, smoke: those are the signs when they come, instead of a clean stop — and a wrongly fuelled diesel will frequently get you onto it and some way along before anything feels wrong at all.
Get off at the next safe junction, switch off, and never restart the car to reposition. It affects what our technicians bring, and so tell us when you ring: on a longer drive — anything near the under 3 miles to the nearest city — assume the mixture has been through the fuel filter, the pump and the injectors.
A bit about Wergs
Wergs is a suburban area located on the outskirts of Wolverhampton, near the River Penk, with a mix of housing types but predominantly detached homes. Wergs sits at an elevation of around 128 metres, close to nearby places such as Tettenhall and Perton. Wergs is situated approximately 2.8 miles from Wolverhampton city centre, making it a convenient residential location. Wergs has a population of around 1371 residents, according to recent estimates.
What comes next when we arrive with you in Wergs
- We check what went in, how much, and whether the engine has run. The responses change the work, which is why we ask before pricing.
- Out flows the tainted mixture.
- What is left in the fuel system should not be what created the issue, so the lines get cleaned and the filter cleaned.
- Your system gets bled, on new diesel.
- Once it's started, our engineers confirm it runs correctly on clean diesel.
The vehicle is then ready for you to pull away. All of it is done where the car is, so it never has to be taken to a garage, and when it has been spotted quickly, long-term damage is very rare.
AdBlue in a diesel tank around Wergs is a different problem
If what was put in was AdBlue rather than petrol, the first step is the same — do not fire it up — but this problem is not. Thinned diesel, and no protection left for the fuel system that depends on it. That's petrol. AdBlue is urea dissolved in water, and in a diesel tank it brings corrosion and build-up instead.
Both are ours. There is a separate Wergs page for AdBlue removal, with the details on it — including the reasons it frequently turns out to be the worse of the two.
How much is a petrol-in-diesel fuel drain in Wergs?
One figure wouldn't be fair here, because this isn't one job. These are the things that change it:
- Whether your engine has been started or driven. This is the key one.
- How much of the wrong fuel got in, weighed against how much your tank takes.
- The type of fluid in the tank, unleaded or AdBlue.
- Access: the vehicle's position, and if working on it there is sensible for a van.
The vehicle, the amount, whether it has run — give us those and the answer comes back straight and not as a range. If it's not urgent — the vehicle is at home and going nowhere — works too.
Things we get about petrol in diesel around Wergs
I'm on a forecourt around Wergs. Can you drain the vehicle on the spot?
A big share of this work happens there, so yes. Our engineers attend Esso and the other forecourts around town all the time, with the owner's permission — tell us which one you're at when you call and we'll tell you whether we can work there.
How much petrol in a diesel is too much?
Proportion decides it rather than litres — and more than either, whether the motor has run. Five litres into a nearly dry tank is not five into a full one, no. But both land on the same question in the end: has that mix been sucked right through, or has it not?
Already driven it with petrol in the diesel? Now what?
Stop sensibly. Off. Nothing after that. Not restarting it is the single most helpful thing available to you now. Driving does move the trouble out of your tank then into your pump and injectors, yes, and it stays salvageable a lot more frequently than drivers fear.
My warranty — does a fuel drain void it?
It is not a change, and so a drain then flush carried out properly doesn't invalidate a manufacturer's warranty. A disagreement 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?
What petrol has thinned isn't replaced by two-stroke oil, which is an old workaround for a different issue. So no. After that? Still petrol in your tank, and a pump that has to cope with the stuff.
A main dealer for petrol in a diesel — essential?
Wherever the car is, our technicians drain and clean it there, so a trip to the main dealer doesn't come into it.
You, and your car, still together?
Turned off is the way it remains.
Driven it already? Then somewhere sensible, stop, turn off, and no restarting the vehicle after that. Cold, parked, going nowhere: that's the best position to be in. Drivers fear this a lot more than they need to.
Throughout West Midlands and in Wergs: on-site fuel draining, at home or on the forecourt or at the roadside.