Put Petrol in a Diesel Car in The Dings?
With your tank still carrying the fuel and the motor not yet started, almost every job needs only a drain, so leave the motor off. That result is settled in the minutes immediately after filling up, and not by the amount that was put in. Throughout The Dings and the rest of Bristol, Petrol in Diesel drains the vehicle and flushes it where it stands, whether at a roadside, on a drive or at a forecourt. Phone so we can tell you what happens next before you try any more.
What to do first about petrol in a diesel
- While you drive, your pump and the injectors wear. That's why you never fire it up, and why you do not believe it once it has started. The catch about petrol in a diesel in particular — the part most people get wrong — is that it drives off happily for the first mile or two. Diesel in a petrol engine generally can't run at all, which stops the person and stops the harm with them. This one lets you keep going.
- Two things, diesel: it combusts, and on the way through it keeps that high-pressure pump and injectors lubricated. Petrol only does the one. Which is why your ignition remains off as well — switch it on and you often prime that system, and that's petrol exiting your tank for precisely those parts.
- Do not water down it. Diesel poured on top removes nothing, so all you get is more of what was already there, because percentage isn't how a diesel fuel system accepts petrol. Super unleaded? Just petrol. The grade makes no difference.
- Our team would sooner drive to an odd spot than have it started — so if you safely can, stay put. Nothing is simpler to sort out than a motor that has not moved. On the verge on Oxford Street, that means hazards on and leave it.
- Before you dial, get your location. Anything nearest to you with a name on it, plus a postcode starting BS2 0 — that's what settles whether the technician arrives or circles.
- Dial 0333 366 0103. Prepare for three questions — what got in, approximately how many litres, plus if your car has been turned over. Your responses determine all that follows.
Quarter past eight, a rushed top-up on the way in, and it dawns on you at about eleven — by that point the diesel Renault Megane has been standing at Bristol Temple Meads for three hours. Ring us then keep the car precisely where it stands. The drive in is the part that matters now, since diesel has two roles on its way through a motor: it burns, and before it ignites it lubricates its injection pump and the injectors. Petrol manages the first and not the second. So those few miles were covered with your pump working on a fuel that had shed most of the protection it is designed around — which is why the question our engineers ask is how many miles you went, not how long the vehicle has been sitting.
Easy, these ones, and the reason is the mileage: a mile at easy throttle pulls little diesel. Petrol into a diesel Skoda Octavia somewhere in The Dings, a boot full of shopping, and you stranded at The organic store — phone. Leaving the bay is not worth another start. Your tank gets emptied where it stands, your fuel lines flushed, new diesel in, and you head home.
A diesel injection system works hydraulically as well as chemically: the fuel has to hold pressure, not merely burn. Dilute that fuel and pressure which should build and stay built bleeds past gaps instead, leaving your engine a poorer, later, less even delivery than it was built around. Petrol dilutes diesel, and diesel has to be thick enough to seal the close-fitting components it passes through — that's the entire process. It explains the usual The Dings Park call too: a diesel Mercedes C-Class that travelled out without complaint and came back down on power, uneven at idle, perhaps smoking a little. None of which is the engine failing, and that is the part worth hearing. Your fuel has stopped behaving like diesel. Put your fuel right and it stops.
Knocking, an uneven idle, white smoke, a throttle gone limp. That's a wrongly fuelled diesel BMW 5 Series telling you what is wrong. Switch off where you have stopped, near The Redeemed Christian Church of God or anywhere else, and never start it to find a better place.
By this point your tank isn't where most of the problem is. Once a diesel has run, the mix is in your filter, your lines, your pump and its rail — and it doesn't come back out with that tank contents. A diesel Vauxhall Astra that made it close to George Daniel Jones needs the circuit flushed, not cleared.
Can petrol be pumped out of a diesel at the forecourt?
A good share of this work is finished at the pump, since that is where it often kicks off. The drain normally happens on the spot. Still on the forecourt at Shell? Given the site's permission, that's a place our engineers work, and regularly.
At a garage, the mistake is halted with your engine never run, and no place else manages that. The few seconds between seeing your receipt and going for the key determine how much needs rinsing. Anywhere other than a forecourt — a car park, a drive, a lay-by — your car was started and driven to get there, so fuel was pulled from the tank, through the fuel filter and into your high-pressure pump. That means the lines and the filter need flushing as well as that tank. It's not a catastrophe, and we can still sort it out where the vehicle sits.
Clear of the pump, the next driver can get by — so yes, let the staff help you roll it. Well worth doing. Starting the car over four vehicle lengths? Don't.
Service around The Dings
The Dings is a residential suburb, so our technicians go out to the town and to anywhere near it on the usual trips: Box Makers Yard, Newtown, Barton Hill, Russell Town and St Philips Marsh.
We do come. The names above are merely the closest neighbours, and a page exists for the majority of places around Bristol, so an absence from the list isn't an absence from our coverage. Phone to ask rather than presuming — borders above all, and wherever your satnav tends to struggle with.
The ground the page spans is on this map. Your car never needs to travel to us. Our technicians work throughout the lot — roadside, forecourts, driveways, car parks.
The Dings: stranded where you stopped
Not everyone gets a chance to pull in somewhere suitable. A common call for us instead of an unusual one: noticed after setting off, finished up by the verge of Days Road or in a lay-by with the hazards going.
Out of the vehicle when it is not sensible to be inside, with it if it is. It will frequently oblige. A diesel running on petrol limps along very willingly, and that's the problem: fire it up to get to somewhere handier and that blend goes further into the fuel system with every mile covered. A technician heading to a tricky location is no trouble for us, and it is much better for the car than carrying on.
Some miles on petrol in a diesel: what next?
Here is where the M32 comes in — under a mile away from The Dings. Some distance along, and onto it in the first place: a wrongly fuelled diesel will usually do both before anything seems wrong. What you get then is seldom a tidy stop. Power falls away, the idle goes lumpy, and there may be smoke.
Come off at the first sensible exit, turn off, and don't restart the car to reposition. On a longer drive — anything near the under 3 miles to the closest city — assume the contamination has been through the fuel filter, your pump and the injectors, and mention it when you call. It alters what our engineers bring.
The Dings itself
The Dings is a suburban area located on the riverside in Bristol, with a mix of residential and industrial spaces. The Dings sits at an elevation of 18 metres, close to the city centre and nearby areas such as Box Makers Yard and Newtown. The Dings is predominantly composed of flat housing, reflecting its urban character. The Dings is situated near Barton Hill, another Bristol suburb, and is approximately 1.1 miles from the city centre.
Our job around The Dings, step by step
- Our technicians find out what was put in, how much, and whether the engine has run. The answers shape the work, which is why our technicians ask before quoting.
- The tank is cleared completely.
- Our technicians rinse the lines and clear your filter, so what is remaining in your system is not what created the issue.
- Fresh diesel goes in, and then your system gets bled.
- When it is turned on, our technicians make sure it runs correctly on fresh diesel.
From there, you're ready to pull away. Our engineers do everything wherever the car has stopped, which means it never needs to be taken to a garage, and when it has been noticed early, it is very unusual for there to be permanent damage.
The Dings AdBlue removal is a distinct job
The fault is not the same, though the first rule is — never start it — if what was put in was AdBlue instead of petrol. The lubrication a fuel system relies on gets stripped away by petrol, which dilutes the diesel. AdBlue is urea dissolved in water, and in a diesel tank it causes rust and deposits in its place.
Often the more serious of the two, AdBlue — and the full story lives on its own The Dings page. Both are ours to handle.
What a petrol-in-diesel drain costs around The Dings
One figure would not be honest here, because this is not one job. These are the things that move it:
- Has it been run or driven? Nothing else matters for as much.
- How much of the wrong fuel went in, judged against how much the tank can hold.
- AdBlue or unleaded, whichever got in.
- Whether our van can safely get to the car and work on it, which rests on where your vehicle is.
The vehicle, the quantity, whether it has run — give us those and the answer comes back firm rather than as a range. Motor at home, going nowhere, nothing pressing about it — is good for that.
Petrol in diesel: common queries around The Dings
At a petrol station around The Dings, can you do a fuel drain there?
Yes — forecourts are where a big part of this takes place. Tell us which one you're at when you call and we will tell you whether we can work there. With the site's permission our technicians visit Esso and the other forecourts around town routinely.
How much petrol is too much for a diesel?
Ratio decides it instead of litres — and more than either, whether your motor has run. An almost empty tank with five litres in it, against a full one with the same five: separate situations, certainly. Either way, the work required comes down to one thing, which is whether the fuel system has had that mix pulled through it.
Already driven it with petrol in your diesel? What then?
Pull in somewhere sensible, switch off, then leave the car off. Driving takes the trouble 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 valuable thing left to you is not restarting the vehicle.
Fuel drains and manufacturer warranties
It isn't a change, so a drain and flush carried out correctly doesn't void 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. Two-stroke oil is an old fix for a distinct fault and it doesn't put back what petrol has thinned. Petrol remains in that tank after that, whatever else goes in, and the pump gets no respite from it.
Does petrol in a diesel have to go to a main dealer?
You do not need one. The vehicle is drained and cleaned wherever it is, with no need to take it to a dealership.
You, and your vehicle, still together?
Leave it turned off.
If you have already driven the car, pull over somewhere safe, turn it off then keep it off. Cold, stationary, going nowhere: that's the best place to be in. People fear this much more than they need to.
At the roadside, on the forecourt or at home — on-site fuel draining in The Dings and across Bristol.